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[GH-ISSUE #160] Internode low latency test dispatch & combine finished with error #140

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opened 2026-10-26 09:55:08 +00:00 by bsakaguchi · 5 comments

bsakaguchi commented

2026-10-26 09:55:08 +00:00

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Originally created by @yuan-luo on GitHub (May 13, 2025).
Original GitHub issue: https://github.com/deepseek-ai/DeepEP/issues/160

When I ran internode low latency test, the dispatch and combine finished correctly, but the test case dump error printing in the end.

Node 1:

root@1e604ac9d157:/home/dpsk_a2a/DeepEP# NCCL_DEBUG=WARN MASTER_ADDR=<MASTER_IP> WORLD_SIZE=2 RANK=0 python3 tests/test_low_latency.py
Allocating buffer size: 2115.111296 MB ...
......
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 0 nranks 16 tag 4 - DONE
[rank 0] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.58 us, min_t=962.43 us, max_t=994.94 us
[rank 1] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.81 us, min_t=961.82 us, max_t=995.49 us
[rank 6] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.93 us, min_t=961.12 us, max_t=997.79 us
[rank 2] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.71 us, min_t=964.48 us, max_t=987.07 us
[rank 4] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.75 us, min_t=960.96 us, max_t=996.83 us
[rank 7] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.71 us, min_t=964.35 us, max_t=993.25 us
[rank 3] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.98 us, min_t=956.42 us, max_t=992.29 us
[rank 5] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.53 us, min_t=954.53 us, max_t=996.86 us
[rank 1] Dispatch bandwidth: 21.22 GB/s, avg_t=353.99 us | Combine bandwidth: 22.93 GB/s, avg_t=634.05 us
[rank 4] Dispatch bandwidth: 21.76 GB/s, avg_t=345.21 us | Combine bandwidth: 22.92 GB/s, avg_t=634.31 us
[rank 0] Dispatch bandwidth: 22.30 GB/s, avg_t=336.84 us | Combine bandwidth: 23.01 GB/s, avg_t=631.76 us
[rank 2] Dispatch bandwidth: 21.51 GB/s, avg_t=349.20 us | Combine bandwidth: 23.01 GB/s, avg_t=631.73 us
[rank 3] Dispatch bandwidth: 21.41 GB/s, avg_t=350.90 us | Combine bandwidth: 22.91 GB/s, avg_t=634.48 us
[rank 6] Dispatch bandwidth: 22.45 GB/s, avg_t=334.54 us | Combine bandwidth: 22.94 GB/s, avg_t=633.66 us
[rank 5] Dispatch bandwidth: 22.08 GB/s, avg_t=340.25 us | Combine bandwidth: 22.92 GB/s, avg_t=634.31 us
[rank 7] Dispatch bandwidth: 22.18 GB/s, avg_t=338.64 us | Combine bandwidth: 23.41 GB/s, avg_t=621.07 us
[rank 1] Dispatch send/recv time: 28.29 us | Combine send/recv time: 28.58 us
[rank 4] Dispatch send/recv time: 28.25 us | Combine send/recv time: 28.81 us
[rank 2] Dispatch send/recv time: 28.45 us | Combine send/recv time: 28.79 us
[rank 3] Dispatch send/recv time: 28.26 us | Combine send/recv time: 28.85 us
[rank 0] Dispatch send/recv time: 27.99 us | Combine send/recv time: 28.84 us
[rank 6] Dispatch send/recv time: 27.97 us | Combine send/recv time: 28.56 us
[rank 5] Dispatch send/recv time: 28.12 us | Combine send/recv time: 28.94 us
[rank 7] Dispatch send/recv time: 28.24 us | Combine send/recv time: 29.03 us
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 4 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 0 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 2 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 5 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 7 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 1 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 6 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 3 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 6 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 7 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 5 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 3 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 1 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 2 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 4 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 0 nranks 16 tag 4 - DONE
W0513 15:52:40.025000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7230 via signal SIGTERM
W0513 15:52:40.026000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7231 via signal SIGTERM
W0513 15:52:40.026000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7233 via signal SIGTERM
W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7234 via signal SIGTERM
W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7235 via signal SIGTERM
W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7236 via signal SIGTERM
W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7237 via signal SIGTERM
Traceback (most recent call last):
  File "/home/dpsk_a2a/DeepEP/tests/test_low_latency.py", line 172, in <module>
    torch.multiprocessing.spawn(test_loop, args=(num_processes,), nprocs=num_processes)
  File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 328, in spawn
    return start_processes(fn, args, nprocs, join, daemon, start_method="spawn")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 284, in start_processes
    while not context.join():
              ^^^^^^^^^^^^^^
  File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 184, in join
    raise ProcessExitedException(
torch.multiprocessing.spawn.ProcessExitedException: process 2 terminated with signal SIGSEGV

Node 2:

root@0540de603a8e:/home/dpsk_a2a/DeepEP# NCCL_DEBUG=WARN MASTER_ADDR=<MASTER_IP> WORLD_SIZE=2 RANK=1 python3 tests/test_low_latency.py
Allocating buffer size: 2115.111296 MB ...
......
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 8 nranks 16 tag 4 - DONE
[rank 14] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.49 us, min_t=958.24 us, max_t=993.06 us
[rank 10] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.50 us, min_t=955.65 us, max_t=992.26 us
[rank 15] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.40 us, min_t=956.29 us, max_t=994.27 us
[rank 8] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.64 us, min_t=961.98 us, max_t=993.25 us
[rank 13] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.62 us, min_t=959.10 us, max_t=995.14 us
[rank 12] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.30 us, min_t=955.07 us, max_t=994.40 us
[rank 11] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.62 us, min_t=961.54 us, max_t=991.52 us
[rank 9] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.71 us, min_t=964.22 us, max_t=988.48 us
[rank 14] Dispatch bandwidth: 22.24 GB/s, avg_t=337.70 us | Combine bandwidth: 22.75 GB/s, avg_t=639.08 us
[rank 10] Dispatch bandwidth: 21.51 GB/s, avg_t=349.25 us | Combine bandwidth: 23.00 GB/s, avg_t=631.95 us
[rank 15] Dispatch bandwidth: 22.62 GB/s, avg_t=332.15 us | Combine bandwidth: 22.74 GB/s, avg_t=639.28 us
[rank 11] Dispatch bandwidth: 22.15 GB/s, avg_t=339.13 us | Combine bandwidth: 23.00 GB/s, avg_t=632.14 us
[rank 8] Dispatch bandwidth: 23.14 GB/s, avg_t=324.60 us | Combine bandwidth: 22.64 GB/s, avg_t=642.14 us
[rank 9] Dispatch bandwidth: 21.42 GB/s, avg_t=350.74 us | Combine bandwidth: 22.83 GB/s, avg_t=636.74 us
[rank 13] Dispatch bandwidth: 22.47 GB/s, avg_t=334.25 us | Combine bandwidth: 22.79 GB/s, avg_t=637.89 us
[rank 12] Dispatch bandwidth: 21.82 GB/s, avg_t=344.33 us | Combine bandwidth: 23.08 GB/s, avg_t=629.81 us
[rank 9] Dispatch send/recv time: 28.80 us | Combine send/recv time: 28.67 us
[rank 13] Dispatch send/recv time: 28.36 us | Combine send/recv time: 28.63 us
[rank 8] Dispatch send/recv time: 28.82 us | Combine send/recv time: 28.52 us
[rank 11] Dispatch send/recv time: 27.96 us | Combine send/recv time: 28.54 us
[rank 14] Dispatch send/recv time: 27.76 us | Combine send/recv time: 28.58 us
[rank 12] Dispatch send/recv time: 28.77 us | Combine send/recv time: 29.07 us
[rank 15] Dispatch send/recv time: 28.35 us | Combine send/recv time: 28.78 us
[rank 10] Dispatch send/recv time: 28.70 us | Combine send/recv time: 28.78 us
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 8 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 13 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 10 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 9 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 11 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 14 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 15 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 12 nranks 16 tag 0 - ENTER
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 11 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 14 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 15 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 9 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 13 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 10 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 12 nranks 16 tag 4 - DONE
/home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 8 nranks 16 tag 4 - DONE
W0513 15:52:34.833000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5939 via signal SIGTERM
W0513 15:52:34.833000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5940 via signal SIGTERM
W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5941 via signal SIGTERM
W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5942 via signal SIGTERM
W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5943 via signal SIGTERM
W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5944 via signal SIGTERM
W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5945 via signal SIGTERM
Traceback (most recent call last):
  File "/home/dpsk_a2a/DeepEP/tests/test_low_latency.py", line 172, in <module>
    torch.multiprocessing.spawn(test_loop, args=(num_processes,), nprocs=num_processes)
  File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 328, in spawn
    return start_processes(fn, args, nprocs, join, daemon, start_method="spawn")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 284, in start_processes
    while not context.join():
              ^^^^^^^^^^^^^^
  File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 184, in join
    raise ProcessExitedException(
torch.multiprocessing.spawn.ProcessExitedException: process 0 terminated with signal SIGSEGV

Originally created by @yuan-luo on GitHub (May 13, 2025). Original GitHub issue: https://github.com/deepseek-ai/DeepEP/issues/160 When I ran internode low latency test, the dispatch and combine finished correctly, but the test case dump error printing in the end. Node 1: ``` root@1e604ac9d157:/home/dpsk_a2a/DeepEP# NCCL_DEBUG=WARN MASTER_ADDR=<MASTER_IP> WORLD_SIZE=2 RANK=0 python3 tests/test_low_latency.py Allocating buffer size: 2115.111296 MB ... ...... /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 0 nranks 16 tag 4 - DONE [rank 0] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.58 us, min_t=962.43 us, max_t=994.94 us [rank 1] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.81 us, min_t=961.82 us, max_t=995.49 us [rank 6] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.93 us, min_t=961.12 us, max_t=997.79 us [rank 2] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.71 us, min_t=964.48 us, max_t=987.07 us [rank 4] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.75 us, min_t=960.96 us, max_t=996.83 us [rank 7] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.71 us, min_t=964.35 us, max_t=993.25 us [rank 3] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.98 us, min_t=956.42 us, max_t=992.29 us [rank 5] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.53 us, min_t=954.53 us, max_t=996.86 us [rank 1] Dispatch bandwidth: 21.22 GB/s, avg_t=353.99 us | Combine bandwidth: 22.93 GB/s, avg_t=634.05 us [rank 4] Dispatch bandwidth: 21.76 GB/s, avg_t=345.21 us | Combine bandwidth: 22.92 GB/s, avg_t=634.31 us [rank 0] Dispatch bandwidth: 22.30 GB/s, avg_t=336.84 us | Combine bandwidth: 23.01 GB/s, avg_t=631.76 us [rank 2] Dispatch bandwidth: 21.51 GB/s, avg_t=349.20 us | Combine bandwidth: 23.01 GB/s, avg_t=631.73 us [rank 3] Dispatch bandwidth: 21.41 GB/s, avg_t=350.90 us | Combine bandwidth: 22.91 GB/s, avg_t=634.48 us [rank 6] Dispatch bandwidth: 22.45 GB/s, avg_t=334.54 us | Combine bandwidth: 22.94 GB/s, avg_t=633.66 us [rank 5] Dispatch bandwidth: 22.08 GB/s, avg_t=340.25 us | Combine bandwidth: 22.92 GB/s, avg_t=634.31 us [rank 7] Dispatch bandwidth: 22.18 GB/s, avg_t=338.64 us | Combine bandwidth: 23.41 GB/s, avg_t=621.07 us [rank 1] Dispatch send/recv time: 28.29 us | Combine send/recv time: 28.58 us [rank 4] Dispatch send/recv time: 28.25 us | Combine send/recv time: 28.81 us [rank 2] Dispatch send/recv time: 28.45 us | Combine send/recv time: 28.79 us [rank 3] Dispatch send/recv time: 28.26 us | Combine send/recv time: 28.85 us [rank 0] Dispatch send/recv time: 27.99 us | Combine send/recv time: 28.84 us [rank 6] Dispatch send/recv time: 27.97 us | Combine send/recv time: 28.56 us [rank 5] Dispatch send/recv time: 28.12 us | Combine send/recv time: 28.94 us [rank 7] Dispatch send/recv time: 28.24 us | Combine send/recv time: 29.03 us /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 4 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 0 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 2 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 5 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 7 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 1 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 6 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 3 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 6 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 7 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 5 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 3 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 1 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 2 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 4 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 0 nranks 16 tag 4 - DONE W0513 15:52:40.025000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7230 via signal SIGTERM W0513 15:52:40.026000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7231 via signal SIGTERM W0513 15:52:40.026000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7233 via signal SIGTERM W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7234 via signal SIGTERM W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7235 via signal SIGTERM W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7236 via signal SIGTERM W0513 15:52:40.027000 7102 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 7237 via signal SIGTERM Traceback (most recent call last): File "/home/dpsk_a2a/DeepEP/tests/test_low_latency.py", line 172, in <module> torch.multiprocessing.spawn(test_loop, args=(num_processes,), nprocs=num_processes) File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 328, in spawn return start_processes(fn, args, nprocs, join, daemon, start_method="spawn") ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 284, in start_processes while not context.join(): ^^^^^^^^^^^^^^ File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 184, in join raise ProcessExitedException( torch.multiprocessing.spawn.ProcessExitedException: process 2 terminated with signal SIGSEGV ``` Node 2: ``` root@0540de603a8e:/home/dpsk_a2a/DeepEP# NCCL_DEBUG=WARN MASTER_ADDR=<MASTER_IP> WORLD_SIZE=2 RANK=1 python3 tests/test_low_latency.py Allocating buffer size: 2115.111296 MB ... ...... /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 8 nranks 16 tag 4 - DONE [rank 14] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.49 us, min_t=958.24 us, max_t=993.06 us [rank 10] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.50 us, min_t=955.65 us, max_t=992.26 us [rank 15] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.40 us, min_t=956.29 us, max_t=994.27 us [rank 8] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.64 us, min_t=961.98 us, max_t=993.25 us [rank 13] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.62 us, min_t=959.10 us, max_t=995.14 us [rank 12] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.30 us, min_t=955.07 us, max_t=994.40 us [rank 11] Dispatch + combine bandwidth: 22.65 GB/s, avg_t=973.62 us, min_t=961.54 us, max_t=991.52 us [rank 9] Dispatch + combine bandwidth: 22.64 GB/s, avg_t=973.71 us, min_t=964.22 us, max_t=988.48 us [rank 14] Dispatch bandwidth: 22.24 GB/s, avg_t=337.70 us | Combine bandwidth: 22.75 GB/s, avg_t=639.08 us [rank 10] Dispatch bandwidth: 21.51 GB/s, avg_t=349.25 us | Combine bandwidth: 23.00 GB/s, avg_t=631.95 us [rank 15] Dispatch bandwidth: 22.62 GB/s, avg_t=332.15 us | Combine bandwidth: 22.74 GB/s, avg_t=639.28 us [rank 11] Dispatch bandwidth: 22.15 GB/s, avg_t=339.13 us | Combine bandwidth: 23.00 GB/s, avg_t=632.14 us [rank 8] Dispatch bandwidth: 23.14 GB/s, avg_t=324.60 us | Combine bandwidth: 22.64 GB/s, avg_t=642.14 us [rank 9] Dispatch bandwidth: 21.42 GB/s, avg_t=350.74 us | Combine bandwidth: 22.83 GB/s, avg_t=636.74 us [rank 13] Dispatch bandwidth: 22.47 GB/s, avg_t=334.25 us | Combine bandwidth: 22.79 GB/s, avg_t=637.89 us [rank 12] Dispatch bandwidth: 21.82 GB/s, avg_t=344.33 us | Combine bandwidth: 23.08 GB/s, avg_t=629.81 us [rank 9] Dispatch send/recv time: 28.80 us | Combine send/recv time: 28.67 us [rank 13] Dispatch send/recv time: 28.36 us | Combine send/recv time: 28.63 us [rank 8] Dispatch send/recv time: 28.82 us | Combine send/recv time: 28.52 us [rank 11] Dispatch send/recv time: 27.96 us | Combine send/recv time: 28.54 us [rank 14] Dispatch send/recv time: 27.76 us | Combine send/recv time: 28.58 us [rank 12] Dispatch send/recv time: 28.77 us | Combine send/recv time: 29.07 us [rank 15] Dispatch send/recv time: 28.35 us | Combine send/recv time: 28.78 us [rank 10] Dispatch send/recv time: 28.70 us | Combine send/recv time: 28.78 us /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 8 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 13 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 10 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 9 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 11 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 14 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 15 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:559: rank 12 nranks 16 tag 0 - ENTER /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 11 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 14 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 15 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 9 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 13 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 10 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 12 nranks 16 tag 4 - DONE /home/dpsk_a2a/nvshmem_src/src/modules/bootstrap/uid/bootstrap_uid.cpp:bootstrap_uid_barrier:575: rank 8 nranks 16 tag 4 - DONE W0513 15:52:34.833000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5939 via signal SIGTERM W0513 15:52:34.833000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5940 via signal SIGTERM W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5941 via signal SIGTERM W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5942 via signal SIGTERM W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5943 via signal SIGTERM W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5944 via signal SIGTERM W0513 15:52:34.834000 5810 site-packages/torch/multiprocessing/spawn.py:160] Terminating process 5945 via signal SIGTERM Traceback (most recent call last): File "/home/dpsk_a2a/DeepEP/tests/test_low_latency.py", line 172, in <module> torch.multiprocessing.spawn(test_loop, args=(num_processes,), nprocs=num_processes) File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 328, in spawn return start_processes(fn, args, nprocs, join, daemon, start_method="spawn") ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 284, in start_processes while not context.join(): ^^^^^^^^^^^^^^ File "/opt/ac2/lib/python3.12/site-packages/torch/multiprocessing/spawn.py", line 184, in join raise ProcessExitedException( torch.multiprocessing.spawn.ProcessExitedException: process 0 terminated with signal SIGSEGV ```

bsakaguchi commented

2026-10-26 09:55:09 +00:00

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@yuan-luo commented on GitHub (May 13, 2025):

The intranode test finished successfully with no error.
The internode test normal kernel has the same error. This error occurs 100%.

@yuan-luo commented on GitHub (May 13, 2025): The intranode test finished successfully with no error. The internode test normal kernel has the same error. This error occurs 100%.

bsakaguchi commented

2026-10-26 09:55:09 +00:00

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@yuan-luo commented on GitHub (May 13, 2025):

Env: 2 x 8 x H20.

root@0540de603a8e:/home/dpsk_a2a/DeepEP# nvidia-smi topo -m
        GPU0    GPU1    GPU2    GPU3    GPU4    GPU5    GPU6    GPU7    NIC0    NIC1    NIC2    NIC3    CPU Affinity    NUMA Affinity   GPU NUMA ID
GPU0     X      NV18    NV18    NV18    NV18    NV18    NV18    NV18    NODE    NODE    SYS     SYS     0-47,96-143     0               N/A
GPU1    NV18     X      NV18    NV18    NV18    NV18    NV18    NV18    PIX     NODE    SYS     SYS     0-47,96-143     0               N/A
GPU2    NV18    NV18     X      NV18    NV18    NV18    NV18    NV18    NODE    NODE    SYS     SYS     0-47,96-143     0               N/A
GPU3    NV18    NV18    NV18     X      NV18    NV18    NV18    NV18    NODE    PIX     SYS     SYS     0-47,96-143     0               N/A
GPU4    NV18    NV18    NV18    NV18     X      NV18    NV18    NV18    SYS     SYS     PIX     NODE    48-95,144-191   1               N/A
GPU5    NV18    NV18    NV18    NV18    NV18     X      NV18    NV18    SYS     SYS     NODE    NODE    48-95,144-191   1               N/A
GPU6    NV18    NV18    NV18    NV18    NV18    NV18     X      NV18    SYS     SYS     NODE    PIX     48-95,144-191   1               N/A
GPU7    NV18    NV18    NV18    NV18    NV18    NV18    NV18     X      SYS     SYS     NODE    NODE    48-95,144-191   1               N/A
NIC0    NODE    PIX     NODE    NODE    SYS     SYS     SYS     SYS      X      NODE    SYS     SYS
NIC1    NODE    NODE    NODE    PIX     SYS     SYS     SYS     SYS     NODE     X      SYS     SYS
NIC2    SYS     SYS     SYS     SYS     PIX     NODE    NODE    NODE    SYS     SYS      X      NODE
NIC3    SYS     SYS     SYS     SYS     NODE    NODE    PIX     NODE    SYS     SYS     NODE     X 

Legend:

  X    = Self
  SYS  = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
  NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
  PHB  = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
  PXB  = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
  PIX  = Connection traversing at most a single PCIe bridge
  NV#  = Connection traversing a bonded set of # NVLinks

NIC Legend:

  NIC0: mlx5_bond_0
  NIC1: mlx5_bond_1
  NIC2: mlx5_bond_2
  NIC3: mlx5_bond_3

@yuan-luo commented on GitHub (May 13, 2025): Env: 2 x 8 x H20. ``` root@0540de603a8e:/home/dpsk_a2a/DeepEP# nvidia-smi topo -m GPU0 GPU1 GPU2 GPU3 GPU4 GPU5 GPU6 GPU7 NIC0 NIC1 NIC2 NIC3 CPU Affinity NUMA Affinity GPU NUMA ID GPU0 X NV18 NV18 NV18 NV18 NV18 NV18 NV18 NODE NODE SYS SYS 0-47,96-143 0 N/A GPU1 NV18 X NV18 NV18 NV18 NV18 NV18 NV18 PIX NODE SYS SYS 0-47,96-143 0 N/A GPU2 NV18 NV18 X NV18 NV18 NV18 NV18 NV18 NODE NODE SYS SYS 0-47,96-143 0 N/A GPU3 NV18 NV18 NV18 X NV18 NV18 NV18 NV18 NODE PIX SYS SYS 0-47,96-143 0 N/A GPU4 NV18 NV18 NV18 NV18 X NV18 NV18 NV18 SYS SYS PIX NODE 48-95,144-191 1 N/A GPU5 NV18 NV18 NV18 NV18 NV18 X NV18 NV18 SYS SYS NODE NODE 48-95,144-191 1 N/A GPU6 NV18 NV18 NV18 NV18 NV18 NV18 X NV18 SYS SYS NODE PIX 48-95,144-191 1 N/A GPU7 NV18 NV18 NV18 NV18 NV18 NV18 NV18 X SYS SYS NODE NODE 48-95,144-191 1 N/A NIC0 NODE PIX NODE NODE SYS SYS SYS SYS X NODE SYS SYS NIC1 NODE NODE NODE PIX SYS SYS SYS SYS NODE X SYS SYS NIC2 SYS SYS SYS SYS PIX NODE NODE NODE SYS SYS X NODE NIC3 SYS SYS SYS SYS NODE NODE PIX NODE SYS SYS NODE X Legend: X = Self SYS = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI) NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node PHB = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU) PXB = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge) PIX = Connection traversing at most a single PCIe bridge NV# = Connection traversing a bonded set of # NVLinks NIC Legend: NIC0: mlx5_bond_0 NIC1: mlx5_bond_1 NIC2: mlx5_bond_2 NIC3: mlx5_bond_3 ```

bsakaguchi commented

2026-10-26 09:55:09 +00:00

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@alpha-baby commented on GitHub (May 13, 2025):

you config this env:

export NVSHMEM_ENABLE_NIC_PE_MAPPING=1
export NVSHMEM_HCA_PE_MAPPING="mlx5_bond_0:1:2,mlx5_bond_1:1:2,mlx5_bond_2:1:2,mlx5_bond_3:1:2"

nvshmem will SIGSEGV.
I guess it's because ib ojb was repeatedly released in nvshmem.

@alpha-baby commented on GitHub (May 13, 2025): you config this env: ``` export NVSHMEM_ENABLE_NIC_PE_MAPPING=1 export NVSHMEM_HCA_PE_MAPPING="mlx5_bond_0:1:2,mlx5_bond_1:1:2,mlx5_bond_2:1:2,mlx5_bond_3:1:2" ``` nvshmem will SIGSEGV. I guess it's because ib ojb was repeatedly released in nvshmem.

bsakaguchi commented

2026-10-26 09:55:09 +00:00

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@yuan-luo commented on GitHub (May 13, 2025):

root@1e604ac9d157:/home/dpsk_a2a/DeepEP# /opt/nvshmem/bin/nvshmem-info -a
NVSHMEM v3.2.5

Build Information:
  CUDA API                     12080
  CUDA Driver                  12080
  Build Timestamp              May 13 2025 22:28:19
  Build Variables             
        NVSHMEM_DEBUG=OFF NVSHMEM_DEVEL=OFF NVSHMEM_DEFAULT_PMI2=OFF
        NVSHMEM_DEFAULT_PMIX=OFF NVSHMEM_DEFAULT_UCX=OFF
        NVSHMEM_ENABLE_ALL_DEVICE_INLINING=OFF NVSHMEM_GPU_COLL_USE_LDST=OFF
        NVSHMEM_IBGDA_SUPPORT=ON NVSHMEM_IBGDA_SUPPORT_GPUMEM_ONLY=OFF
        NVSHMEM_IBDEVX_SUPPORT=OFF NVSHMEM_IBRC_SUPPORT=ON
        NVSHMEM_MPI_SUPPORT=OFF NVSHMEM_NVTX=ON NVSHMEM_PMIX_SUPPORT=OFF
        NVSHMEM_SHMEM_SUPPORT=OFF NVSHMEM_TEST_STATIC_LIB=OFF
        NVSHMEM_TIMEOUT_DEVICE_POLLING=OFF NVSHMEM_TRACE=OFF NVSHMEM_UCX_SUPPORT=OFF
        NVSHMEM_USE_DLMALLOC=OFF NVSHMEM_USE_NCCL=OFF NVSHMEM_USE_GDRCOPY=ON
        NVSHMEM_VERBOSE=OFF CUDA_HOME=/usr/local/cuda GDRCOPY_HOME=/opt/gdrcopy
        SHMEM_HOME=/usr/local/ompi UCX_HOME=/usr/local/ucx

Standard options:
  NVSHMEM_VERSION              false (type: bool, default: false)
        Print library version at startup
  NVSHMEM_INFO                 false (type: bool, default: false)
        Print environment variable options at startup
  NVSHMEM_DISABLE_NVLS         false (type: bool, default: false)
        Disable NVLS SHARP resources for collectives, even if available for platform
  NVSHMEM_SYMMETRIC_SIZE       1073741824 (type: size, default: 1073741824)
        Specifies the size (in bytes) of the symmetric heap memory per PE. The
        size is implementation-defined and must be at least as large as the integer
        ceiling of the product of the numeric prefix and the scaling factor. The
        character suffixes for the scaling factor are as follows:

          *  k or K multiplies by 2^10 (kibibytes)
          *  m or M multiplies by 2^20 (mebibytes)
          *  g or G multiplies by 2^30 (gibibytes)
          *  t or T multiplies by 2^40 (tebibytes)

        For example, string '20m' is equivalent to the integer value 20971520, or 20
        mebibytes. Similarly the string '3.1M' is equivalent to the integer value
        3250586. Only one multiplier is recognized and any characters following the
        multiplier are ignored, so '20kk' will not produce the same result as '20m'.
        Usage of string '.5m' will yield the same result as the string '0.5m'.
        An invalid value for NVSHMEM_SYMMETRIC_SIZE is an error, which the NVSHMEM
        library shall report by either returning a nonzero value from
        nvshmem_init_thread or causing program termination.
  NVSHMEM_DEBUG                "WARN" (type: string, default: "")
        Set to enable debugging messages.
        Optional values: VERSION, WARN, INFO, ABORT, TRACE

Bootstrap options:
  NVSHMEM_BOOTSTRAP            "PMI" (type: string, default: "PMI")
        Name of the default bootstrap that should be used to initialize NVSHMEM.
        Allowed values: PMI, MPI, SHMEM, plugin, UID
  NVSHMEM_BOOTSTRAP_PMI        "PMI" (type: string, default: "PMI")
        Name of the PMI bootstrap that should be used to initialize NVSHMEM.
        Allowed values: PMI, PMI-2, PMIX
  NVSHMEM_BOOTSTRAP_PLUGIN     "" (type: string, default: "")
        Absolute path to or name of the bootstrap plugin file to load when
        NVSHMEM_BOOTSTRAP=plugin is specified
  NVSHMEM_BOOTSTRAP_MPI_PLUGIN "nvshmem_bootstrap_mpi.so.3" (type: string, default: "nvshmem_bootstrap_mpi.so.3")
        Absolute path to or name of the MPI bootstrap plugin file. 
        NVSHMEM will search for the plugin based on linux linker priorities. See man
        dlopen
  NVSHMEM_BOOTSTRAP_SHMEM_PLUGIN "nvshmem_bootstrap_shmem.so.3" (type: string, default: "nvshmem_bootstrap_shmem.so.3")
        Absolute path to or name of the SHMEM bootstrap plugin file. 
        NVSHMEM will search for the plugin based on linux linker priorities. See man
        dlopen
  NVSHMEM_BOOTSTRAP_PMI_PLUGIN "nvshmem_bootstrap_pmi.so.3" (type: string, default: "nvshmem_bootstrap_pmi.so.3")
        Absolute path to or name of the PMI bootstrap plugin file. 
        NVSHMEM will search for the plugin based on linux linker priorities. See man
        dlopen
  NVSHMEM_BOOTSTRAP_PMI2_PLUGIN "nvshmem_bootstrap_pmi2.so.3" (type: string, default: "nvshmem_bootstrap_pmi2.so.3")
        Absolute path to or name of the PMI-2 bootstrap plugin file. 
        NVSHMEM will search for the plugin based on linux linker priorities. See man
        dlopen
  NVSHMEM_BOOTSTRAP_PMIX_PLUGIN "nvshmem_bootstrap_pmix.so.3" (type: string, default: "nvshmem_bootstrap_pmix.so.3")
        Absolute path to or name of the PMIx bootstrap plugin file. 
        NVSHMEM will search for the plugin based on linux linker priorities. See man
        dlopen
  NVSHMEM_BOOTSTRAP_UID_PLUGIN "nvshmem_bootstrap_uid.so.3" (type: string, default: "nvshmem_bootstrap_uid.so.3")
        Absolute path to or name of the UID bootstrap plugin file. 
        NVSHMEM will search for the plugin based on linux linker priorities. See man
        dlopen

Additional options:
  NVSHMEM_CUDA_PATH            "" (type: string, default: "")
        Path to directory containing libcuda.so (for use when not in default location)
  NVSHMEM_DEBUG_ATTACH_DELAY   0 (type: int, default: 0)
        Delay (in seconds) during the first call to NVSHMEM_INIT to allow for attaching
        a debuggger (Default 0)
  NVSHMEM_DEBUG_FILE           "" (type: string, default: "")
        Debugging output filename, may contain %h for hostname and %p for pid
  NVSHMEM_MAX_TEAMS            32 (type: long, default: 32)
        Maximum number of simultaneous teams allowed
  NVSHMEM_MAX_MEMORY_PER_GPU   137438953472 (type: size, default: 137438953472)
        Maximum memory per GPU
  NVSHMEM_DISABLE_CUDA_VMM     false (type: bool, default: false)
        Disable use of CUDA VMM for P2P memory mapping. By default, CUDA VMM is enabled
        on x86 and disabled on P9. CUDA VMM feature in NVSHMEM requires CUDA RT version
        and CUDA Driver version to be greater than or equal to 11.3.
  NVSHMEM_DISABLE_P2P          false (type: bool, default: false)
        Disable P2P connectivity of GPUs even when available
  NVSHMEM_IGNORE_CUDA_MPS_ACTIVE_THREAD_PERCENTAGE false (type: bool, default: false)
        When doing Multi-Process Per GPU (MPG) run, full API support is available only
        if sum of CUDA_MPS_ACTIVE_THREAD_PERCENTAGE of processes running on a GPU is <=
        100%. Through this variable, user can request NVSHMEM runtime to ignore the
        active thread percentage and allow full MPG support. Users enable it at their
        own risk as NVSHMEM might deadlock.
  NVSHMEM_CUMEM_GRANULARITY    536870912 (type: size, default: 536870912)
        Granularity for cuMemAlloc/cuMemCreate
  NVSHMEM_PROXY_REQUEST_BATCH_MAX 32 (type: int, default: 32)
        Maxmum number of requests that the proxy thread processes in a single iteration
        of the progress loop.

Collectives options:
  NVSHMEM_DISABLE_NCCL         false (type: bool, default: false)
        Disable use of NCCL for collective operations
  NVSHMEM_BARRIER_DISSEM_KVAL  2 (type: int, default: 2)
        Radix of the dissemination algorithm used for barriers
  NVSHMEM_BARRIER_TG_DISSEM_KVAL 2 (type: int, default: 2)
        Radix of the dissemination algorithm used for thread group barriers
  NVSHMEM_FCOLLECT_LL_THRESHOLD 2048 (type: size, default: 2048)
        Message size threshold up to which fcollect LL algo will be used

  NVSHMEM_REDUCE_SCRATCH_SIZE  524288 (type: size, default: 524288)
        Amount of symmetric heap memory (minimum 16B, multiple of 8B) reserved by
        runtime for every team to implement reduce and reducescatter collectives

  NVSHMEM_BCAST_ALGO           0 (type: int, default: 0)
        Broadcast algorithm to be used.
          * 0 - use default algorithm selection strategy

  NVSHMEM_REDMAXLOC_ALGO       1 (type: int, default: 1)
        Reduction algorithm to be used for MAXLOC operation.
          * 1 - default, flag alltoall algorithm
          * 2 - flat reduce + flat bcast
          * 3 - topo-aware two-level reduce + topo-aware bcast


Transport options:
  NVSHMEM_REMOTE_TRANSPORT     "ibrc" (type: string, default: "ibrc")
        Selected transport for remote operations: ibrc, ucx, libfabric, ibdevx, none
  NVSHMEM_ENABLE_NIC_PE_MAPPING true (type: bool, default: false)
        When not set or set to 0, a PE is assigned the NIC on the node that is closest
        to it by distance. When set to 1, NVSHMEM either assigns NICs to PEs on a
        round-robin basis or uses NVSHMEM_HCA_PE_MAPPING or NVSHMEM_HCA_LIST when they
        are specified.
  NVSHMEM_DISABLE_LOCAL_ONLY_PROXY false (type: bool, default: false)
        When running on an NVLink-only configuaration (No-IB, No-UCX), completely
        disable the proxy thread. This will disable device side global exit and device
        side wait timeout polling (enabled by NVSHMEM_TIMEOUT_DEVICE_POLLING build-time
        variable) because these are processed by the proxy thread.
  NVSHMEM_IB_ENABLE_IBGDA      false (type: bool, default: false)
        Set to enable GPU-initiated communication transport.

Hidden options:
  NVSHMEM_INFO_HIDDEN          true (type: bool, default: false)
        Print hidden environment variable options at startup
  NVSHMEM_DISABLE_NVLS_SHARING true (type: bool, default: true)
        Disable NVLS SHARP resource sharing for user-defined teams
  NVSHMEM_HEAP_KIND            "DEVICE" (type: string, default: "DEVICE")
        Specify the memory kind used by the NVSHMEM symmetric heap.
        Allowed values: VIDMEM, SYSMEM
  NVSHMEM_ENABLE_RAIL_OPT      false (type: bool, default: false)
        Enable Rail Optimization when heap is in SYSMEM
  NVSHMEM_BOOTSTRAP_TWO_STAGE  false (type: bool, default: false)
        Ignore CUDA device setting during initialization,forcing two-stage
        initialization
  NVSHMEM_DEBUG_SUBSYS         "" (type: string, default: "")
        Comma separated list of debugging message sources. Prefix with '^' to exclude.
        Values: INIT, COLL, P2P, PROXY, TRANSPORT, MEM, BOOTSTRAP, TOPO, UTIL, ALL
  NVSHMEM_ENABLE_ERROR_CHECKS  false (type: bool, default: false)
        Enable error checks
  NVSHMEM_DISABLE_MNNVL        false (type: bool, default: false)
        Disable MNNVL connectivity for GPUs even when available
  NVSHMEM_CUMEM_HANDLE_TYPE    "FILE_DESCRIPTOR" (type: string, default: "FILE_DESCRIPTOR")
        Handle type for cuMemCreate. Supported are - FABRIC or FILE_DESCRIPTOR
  NVSHMEM_BYPASS_ACCESSIBILITY_CHECK false (type: bool, default: false)
        Bypass peer GPU accessbility checks
  NVSHMEM_FCOLLECT_NTHREADS    512 (type: int, default: 512)
        Sets number of threads per block for fcollect collective.
        By default, if no env is set, default value is min(max_occupancy per CTA, msg
        size per PE).
        If env is specified, value overrides the default irrespective of max occupancy
        per CTA

  NVSHMEM_REDUCESCATTER_NTHREADS 512 (type: int, default: 512)
        Sets number of threads per block for reducescatter collective.
        By default, if no env is set, default value is min(max_occupancy per CTA, msg
        size per PE).
        If env is specified, value overrides the default irrespective of max occupancy
        per CTA

  NVSHMEM_MAX_CTAS             1 (type: int, default: 1)
        Sets number of blocks per grid for host onstream collective.
        By default, if no env is set, default value to 1 CTA
        If env is specified, value overrides the default value

  NVSHMEM_REDUCE_RECEXCH_KVAL  2 (type: int, default: 2)
        Radix of the recursive exchange reduction algorithm
  NVSHMEM_FCOLLECT_LL128_THRESHOLD 0 (type: size, default: 0)
        Message size threshold up to which the fcollect LL128 algo will be used.
        LL128 will be used only when FCOLLECT_LL_THRESHOLD < size
  NVSHMEM_FCOLLECT_NVLS_THRESHOLD 16777216 (type: size, default: 16777216)
        Message size threshold up to which fcollect NVLS algo will be used

  NVSHMEM_REDUCESCATTER_NVLS_THRESHOLD 16777216 (type: size, default: 16777216)
        Message size threshold up to which reducescatter NVLS algo will be used

  NVSHMEM_BCAST_TREE_KVAL      2 (type: int, default: 2)
        Radix of the broadcast tree algorithm
  NVSHMEM_FCOLLECT_ALGO        0 (type: int, default: 0)
        Fcollect algorithm to be used. 
          * 0 - use default algorithm selection strategy

  NVSHMEM_REDUCE_ALGO          0 (type: int, default: 0)
        Allreduce algorithm to be used. 
           * 0/1 - use default algorithm selection strategy

  NVSHMEM_REDUCE_NVLS_THRESHOLD 2048 (type: int, default: 2048)
        Message size threshold up to which allreduce one-shot algo will be used

  NVSHMEM_REDUCESCATTER_ALGO   0 (type: int, default: 0)
        Reduce Scatter algorithm to be used. 
          * 0 - use default algorithm selection strategy

  NVSHMEM_ASSERT_ATOMICS_SYNC  false (type: bool, default: false)
        Bypass flush on wait_until at target
  NVSHMEM_BYPASS_FLUSH         false (type: bool, default: false)
        Bypass flush in proxy when enforcing consistency

NVTX options:
  NVSHMEM_NVTX                 "off" (type: string, default: "off")
        Set to enable NVTX instrumentation. Accepts a comma separated list of
        instrumentation groups. By default the NVTX instrumentation is disabled.
          init                : library setup
          alloc               : memory management
          launch              : kernel launch routines
          coll                : collective communications
          wait                : blocking point-to-point synchronization
          wait_on_stream      : point-to-point synchronization (on stream)
          test                : non-blocking point-to-point synchronization
          memorder            : memory ordering (quiet, fence)
          quiet_on_stream     : nvshmemx_quiet_on_stream
          atomic_fetch        : fetching atomic memory operations
          atomic_set          : non-fetchong atomic memory operations
          rma_blocking        : blocking remote memory access operations
          rma_nonblocking     : non-blocking remote memory access operations
          proxy               : activity of the proxy thread
          common              : init,alloc,launch,coll,memorder,wait,atomic_fetch,rma_blocking,proxy
          all                 : all groups
          off                 : disable all NVTX instrumentation

@yuan-luo commented on GitHub (May 13, 2025): ``` root@1e604ac9d157:/home/dpsk_a2a/DeepEP# /opt/nvshmem/bin/nvshmem-info -a NVSHMEM v3.2.5 Build Information: CUDA API 12080 CUDA Driver 12080 Build Timestamp May 13 2025 22:28:19 Build Variables NVSHMEM_DEBUG=OFF NVSHMEM_DEVEL=OFF NVSHMEM_DEFAULT_PMI2=OFF NVSHMEM_DEFAULT_PMIX=OFF NVSHMEM_DEFAULT_UCX=OFF NVSHMEM_ENABLE_ALL_DEVICE_INLINING=OFF NVSHMEM_GPU_COLL_USE_LDST=OFF NVSHMEM_IBGDA_SUPPORT=ON NVSHMEM_IBGDA_SUPPORT_GPUMEM_ONLY=OFF NVSHMEM_IBDEVX_SUPPORT=OFF NVSHMEM_IBRC_SUPPORT=ON NVSHMEM_MPI_SUPPORT=OFF NVSHMEM_NVTX=ON NVSHMEM_PMIX_SUPPORT=OFF NVSHMEM_SHMEM_SUPPORT=OFF NVSHMEM_TEST_STATIC_LIB=OFF NVSHMEM_TIMEOUT_DEVICE_POLLING=OFF NVSHMEM_TRACE=OFF NVSHMEM_UCX_SUPPORT=OFF NVSHMEM_USE_DLMALLOC=OFF NVSHMEM_USE_NCCL=OFF NVSHMEM_USE_GDRCOPY=ON NVSHMEM_VERBOSE=OFF CUDA_HOME=/usr/local/cuda GDRCOPY_HOME=/opt/gdrcopy SHMEM_HOME=/usr/local/ompi UCX_HOME=/usr/local/ucx Standard options: NVSHMEM_VERSION false (type: bool, default: false) Print library version at startup NVSHMEM_INFO false (type: bool, default: false) Print environment variable options at startup NVSHMEM_DISABLE_NVLS false (type: bool, default: false) Disable NVLS SHARP resources for collectives, even if available for platform NVSHMEM_SYMMETRIC_SIZE 1073741824 (type: size, default: 1073741824) Specifies the size (in bytes) of the symmetric heap memory per PE. The size is implementation-defined and must be at least as large as the integer ceiling of the product of the numeric prefix and the scaling factor. The character suffixes for the scaling factor are as follows: * k or K multiplies by 2^10 (kibibytes) * m or M multiplies by 2^20 (mebibytes) * g or G multiplies by 2^30 (gibibytes) * t or T multiplies by 2^40 (tebibytes) For example, string '20m' is equivalent to the integer value 20971520, or 20 mebibytes. Similarly the string '3.1M' is equivalent to the integer value 3250586. Only one multiplier is recognized and any characters following the multiplier are ignored, so '20kk' will not produce the same result as '20m'. Usage of string '.5m' will yield the same result as the string '0.5m'. An invalid value for NVSHMEM_SYMMETRIC_SIZE is an error, which the NVSHMEM library shall report by either returning a nonzero value from nvshmem_init_thread or causing program termination. NVSHMEM_DEBUG "WARN" (type: string, default: "") Set to enable debugging messages. Optional values: VERSION, WARN, INFO, ABORT, TRACE Bootstrap options: NVSHMEM_BOOTSTRAP "PMI" (type: string, default: "PMI") Name of the default bootstrap that should be used to initialize NVSHMEM. Allowed values: PMI, MPI, SHMEM, plugin, UID NVSHMEM_BOOTSTRAP_PMI "PMI" (type: string, default: "PMI") Name of the PMI bootstrap that should be used to initialize NVSHMEM. Allowed values: PMI, PMI-2, PMIX NVSHMEM_BOOTSTRAP_PLUGIN "" (type: string, default: "") Absolute path to or name of the bootstrap plugin file to load when NVSHMEM_BOOTSTRAP=plugin is specified NVSHMEM_BOOTSTRAP_MPI_PLUGIN "nvshmem_bootstrap_mpi.so.3" (type: string, default: "nvshmem_bootstrap_mpi.so.3") Absolute path to or name of the MPI bootstrap plugin file. NVSHMEM will search for the plugin based on linux linker priorities. See man dlopen NVSHMEM_BOOTSTRAP_SHMEM_PLUGIN "nvshmem_bootstrap_shmem.so.3" (type: string, default: "nvshmem_bootstrap_shmem.so.3") Absolute path to or name of the SHMEM bootstrap plugin file. NVSHMEM will search for the plugin based on linux linker priorities. See man dlopen NVSHMEM_BOOTSTRAP_PMI_PLUGIN "nvshmem_bootstrap_pmi.so.3" (type: string, default: "nvshmem_bootstrap_pmi.so.3") Absolute path to or name of the PMI bootstrap plugin file. NVSHMEM will search for the plugin based on linux linker priorities. See man dlopen NVSHMEM_BOOTSTRAP_PMI2_PLUGIN "nvshmem_bootstrap_pmi2.so.3" (type: string, default: "nvshmem_bootstrap_pmi2.so.3") Absolute path to or name of the PMI-2 bootstrap plugin file. NVSHMEM will search for the plugin based on linux linker priorities. See man dlopen NVSHMEM_BOOTSTRAP_PMIX_PLUGIN "nvshmem_bootstrap_pmix.so.3" (type: string, default: "nvshmem_bootstrap_pmix.so.3") Absolute path to or name of the PMIx bootstrap plugin file. NVSHMEM will search for the plugin based on linux linker priorities. See man dlopen NVSHMEM_BOOTSTRAP_UID_PLUGIN "nvshmem_bootstrap_uid.so.3" (type: string, default: "nvshmem_bootstrap_uid.so.3") Absolute path to or name of the UID bootstrap plugin file. NVSHMEM will search for the plugin based on linux linker priorities. See man dlopen Additional options: NVSHMEM_CUDA_PATH "" (type: string, default: "") Path to directory containing libcuda.so (for use when not in default location) NVSHMEM_DEBUG_ATTACH_DELAY 0 (type: int, default: 0) Delay (in seconds) during the first call to NVSHMEM_INIT to allow for attaching a debuggger (Default 0) NVSHMEM_DEBUG_FILE "" (type: string, default: "") Debugging output filename, may contain %h for hostname and %p for pid NVSHMEM_MAX_TEAMS 32 (type: long, default: 32) Maximum number of simultaneous teams allowed NVSHMEM_MAX_MEMORY_PER_GPU 137438953472 (type: size, default: 137438953472) Maximum memory per GPU NVSHMEM_DISABLE_CUDA_VMM false (type: bool, default: false) Disable use of CUDA VMM for P2P memory mapping. By default, CUDA VMM is enabled on x86 and disabled on P9. CUDA VMM feature in NVSHMEM requires CUDA RT version and CUDA Driver version to be greater than or equal to 11.3. NVSHMEM_DISABLE_P2P false (type: bool, default: false) Disable P2P connectivity of GPUs even when available NVSHMEM_IGNORE_CUDA_MPS_ACTIVE_THREAD_PERCENTAGE false (type: bool, default: false) When doing Multi-Process Per GPU (MPG) run, full API support is available only if sum of CUDA_MPS_ACTIVE_THREAD_PERCENTAGE of processes running on a GPU is <= 100%. Through this variable, user can request NVSHMEM runtime to ignore the active thread percentage and allow full MPG support. Users enable it at their own risk as NVSHMEM might deadlock. NVSHMEM_CUMEM_GRANULARITY 536870912 (type: size, default: 536870912) Granularity for cuMemAlloc/cuMemCreate NVSHMEM_PROXY_REQUEST_BATCH_MAX 32 (type: int, default: 32) Maxmum number of requests that the proxy thread processes in a single iteration of the progress loop. Collectives options: NVSHMEM_DISABLE_NCCL false (type: bool, default: false) Disable use of NCCL for collective operations NVSHMEM_BARRIER_DISSEM_KVAL 2 (type: int, default: 2) Radix of the dissemination algorithm used for barriers NVSHMEM_BARRIER_TG_DISSEM_KVAL 2 (type: int, default: 2) Radix of the dissemination algorithm used for thread group barriers NVSHMEM_FCOLLECT_LL_THRESHOLD 2048 (type: size, default: 2048) Message size threshold up to which fcollect LL algo will be used NVSHMEM_REDUCE_SCRATCH_SIZE 524288 (type: size, default: 524288) Amount of symmetric heap memory (minimum 16B, multiple of 8B) reserved by runtime for every team to implement reduce and reducescatter collectives NVSHMEM_BCAST_ALGO 0 (type: int, default: 0) Broadcast algorithm to be used. * 0 - use default algorithm selection strategy NVSHMEM_REDMAXLOC_ALGO 1 (type: int, default: 1) Reduction algorithm to be used for MAXLOC operation. * 1 - default, flag alltoall algorithm * 2 - flat reduce + flat bcast * 3 - topo-aware two-level reduce + topo-aware bcast Transport options: NVSHMEM_REMOTE_TRANSPORT "ibrc" (type: string, default: "ibrc") Selected transport for remote operations: ibrc, ucx, libfabric, ibdevx, none NVSHMEM_ENABLE_NIC_PE_MAPPING true (type: bool, default: false) When not set or set to 0, a PE is assigned the NIC on the node that is closest to it by distance. When set to 1, NVSHMEM either assigns NICs to PEs on a round-robin basis or uses NVSHMEM_HCA_PE_MAPPING or NVSHMEM_HCA_LIST when they are specified. NVSHMEM_DISABLE_LOCAL_ONLY_PROXY false (type: bool, default: false) When running on an NVLink-only configuaration (No-IB, No-UCX), completely disable the proxy thread. This will disable device side global exit and device side wait timeout polling (enabled by NVSHMEM_TIMEOUT_DEVICE_POLLING build-time variable) because these are processed by the proxy thread. NVSHMEM_IB_ENABLE_IBGDA false (type: bool, default: false) Set to enable GPU-initiated communication transport. Hidden options: NVSHMEM_INFO_HIDDEN true (type: bool, default: false) Print hidden environment variable options at startup NVSHMEM_DISABLE_NVLS_SHARING true (type: bool, default: true) Disable NVLS SHARP resource sharing for user-defined teams NVSHMEM_HEAP_KIND "DEVICE" (type: string, default: "DEVICE") Specify the memory kind used by the NVSHMEM symmetric heap. Allowed values: VIDMEM, SYSMEM NVSHMEM_ENABLE_RAIL_OPT false (type: bool, default: false) Enable Rail Optimization when heap is in SYSMEM NVSHMEM_BOOTSTRAP_TWO_STAGE false (type: bool, default: false) Ignore CUDA device setting during initialization,forcing two-stage initialization NVSHMEM_DEBUG_SUBSYS "" (type: string, default: "") Comma separated list of debugging message sources. Prefix with '^' to exclude. Values: INIT, COLL, P2P, PROXY, TRANSPORT, MEM, BOOTSTRAP, TOPO, UTIL, ALL NVSHMEM_ENABLE_ERROR_CHECKS false (type: bool, default: false) Enable error checks NVSHMEM_DISABLE_MNNVL false (type: bool, default: false) Disable MNNVL connectivity for GPUs even when available NVSHMEM_CUMEM_HANDLE_TYPE "FILE_DESCRIPTOR" (type: string, default: "FILE_DESCRIPTOR") Handle type for cuMemCreate. Supported are - FABRIC or FILE_DESCRIPTOR NVSHMEM_BYPASS_ACCESSIBILITY_CHECK false (type: bool, default: false) Bypass peer GPU accessbility checks NVSHMEM_FCOLLECT_NTHREADS 512 (type: int, default: 512) Sets number of threads per block for fcollect collective. By default, if no env is set, default value is min(max_occupancy per CTA, msg size per PE). If env is specified, value overrides the default irrespective of max occupancy per CTA NVSHMEM_REDUCESCATTER_NTHREADS 512 (type: int, default: 512) Sets number of threads per block for reducescatter collective. By default, if no env is set, default value is min(max_occupancy per CTA, msg size per PE). If env is specified, value overrides the default irrespective of max occupancy per CTA NVSHMEM_MAX_CTAS 1 (type: int, default: 1) Sets number of blocks per grid for host onstream collective. By default, if no env is set, default value to 1 CTA If env is specified, value overrides the default value NVSHMEM_REDUCE_RECEXCH_KVAL 2 (type: int, default: 2) Radix of the recursive exchange reduction algorithm NVSHMEM_FCOLLECT_LL128_THRESHOLD 0 (type: size, default: 0) Message size threshold up to which the fcollect LL128 algo will be used. LL128 will be used only when FCOLLECT_LL_THRESHOLD < size NVSHMEM_FCOLLECT_NVLS_THRESHOLD 16777216 (type: size, default: 16777216) Message size threshold up to which fcollect NVLS algo will be used NVSHMEM_REDUCESCATTER_NVLS_THRESHOLD 16777216 (type: size, default: 16777216) Message size threshold up to which reducescatter NVLS algo will be used NVSHMEM_BCAST_TREE_KVAL 2 (type: int, default: 2) Radix of the broadcast tree algorithm NVSHMEM_FCOLLECT_ALGO 0 (type: int, default: 0) Fcollect algorithm to be used. * 0 - use default algorithm selection strategy NVSHMEM_REDUCE_ALGO 0 (type: int, default: 0) Allreduce algorithm to be used. * 0/1 - use default algorithm selection strategy NVSHMEM_REDUCE_NVLS_THRESHOLD 2048 (type: int, default: 2048) Message size threshold up to which allreduce one-shot algo will be used NVSHMEM_REDUCESCATTER_ALGO 0 (type: int, default: 0) Reduce Scatter algorithm to be used. * 0 - use default algorithm selection strategy NVSHMEM_ASSERT_ATOMICS_SYNC false (type: bool, default: false) Bypass flush on wait_until at target NVSHMEM_BYPASS_FLUSH false (type: bool, default: false) Bypass flush in proxy when enforcing consistency NVTX options: NVSHMEM_NVTX "off" (type: string, default: "off") Set to enable NVTX instrumentation. Accepts a comma separated list of instrumentation groups. By default the NVTX instrumentation is disabled. init : library setup alloc : memory management launch : kernel launch routines coll : collective communications wait : blocking point-to-point synchronization wait_on_stream : point-to-point synchronization (on stream) test : non-blocking point-to-point synchronization memorder : memory ordering (quiet, fence) quiet_on_stream : nvshmemx_quiet_on_stream atomic_fetch : fetching atomic memory operations atomic_set : non-fetchong atomic memory operations rma_blocking : blocking remote memory access operations rma_nonblocking : non-blocking remote memory access operations proxy : activity of the proxy thread common : init,alloc,launch,coll,memorder,wait,atomic_fetch,rma_blocking,proxy all : all groups off : disable all NVTX instrumentation ```

bsakaguchi commented

2026-10-26 09:55:09 +00:00

Author

Owner

@cong543 commented on GitHub (Jun 4, 2025):

@yuan-luo ，May I ask if you have solved this problem? I encountered a similar problem

NVSHMEM_BOOTSTRAP_UID_SOCK_IFNAME=ens19f0 MASTER_ADDR=172.16.1.134 WORLD_SIZE=2 RANK=0 python DeepEP/tests/test_low_latency.py
Allocating buffer size: 2115.111296 MB ...
[rank 0] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.67 us, min_t=790.27 us, max_t=946.85 us
[rank 6] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.48 us, min_t=784.70 us, max_t=946.30 us
[rank 7] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.54 us, min_t=784.58 us, max_t=946.40 us
[rank 3] Dispatch + combine bandwidth: 23.78 GB/s, avg_t=927.20 us, min_t=791.84 us, max_t=945.63 us
[rank 5] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.46 us, min_t=791.14 us, max_t=944.67 us
[rank 2] Dispatch + combine bandwidth: 23.78 GB/s, avg_t=927.33 us, min_t=789.38 us, max_t=949.34 us
[rank 1] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.61 us, min_t=784.67 us, max_t=946.27 us
[rank 4] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.67 us, min_t=794.78 us, max_t=945.12 us
[rank 0] Dispatch bandwidth: 38.82 GB/s, avg_t=193.48 us | Combine bandwidth: 43.14 GB/s, avg_t=336.98 us
[rank 6] Dispatch bandwidth: 39.91 GB/s, avg_t=188.19 us | Combine bandwidth: 42.89 GB/s, avg_t=338.92 us
[rank 3] Dispatch bandwidth: 39.87 GB/s, avg_t=188.42 us | Combine bandwidth: 42.96 GB/s, avg_t=338.36 us
[rank 5] Dispatch bandwidth: 39.38 GB/s, avg_t=190.77 us | Combine bandwidth: 43.29 GB/s, avg_t=335.82 us
[rank 4] Dispatch bandwidth: 39.14 GB/s, avg_t=191.90 us | Combine bandwidth: 43.23 GB/s, avg_t=336.27 us
[rank 1] Dispatch bandwidth: 39.16 GB/s, avg_t=191.80 us | Combine bandwidth: 43.12 GB/s, avg_t=337.12 us
[rank 7] Dispatch bandwidth: 39.87 GB/s, avg_t=188.41 us | Combine bandwidth: 43.00 GB/s, avg_t=338.03 us
[rank 2] Dispatch bandwidth: 39.68 GB/s, avg_t=189.30 us | Combine bandwidth: 42.86 GB/s, avg_t=339.20 us
[rank 7] Dispatch send/recv time: 35.53 us | Combine send/recv time: 40.60 us
[rank 1] Dispatch send/recv time: 39.25 us | Combine send/recv time: 40.27 us
[rank 2] Dispatch send/recv time: 36.21 us | Combine send/recv time: 41.88 us
[rank 4] Dispatch send/recv time: 35.42 us | Combine send/recv time: 41.97 us
[rank 6] Dispatch send/recv time: 34.60 us | Combine send/recv time: 40.50 us
[rank 3] Dispatch send/recv time: 36.04 us | Combine send/recv time: 41.72 us
[rank 0] Dispatch send/recv time: 38.82 us | Combine send/recv time: 40.93 us
[rank 5] Dispatch send/recv time: 35.33 us | Combine send/recv time: 40.70 us
[h20ln1:208  :0:208] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55cff010a)
[h20ln1:205  :0:205] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x561bbbd70)
[h20ln1:209  :0:209] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55f575575)
[h20ln1:210  :0:210] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x5623a6133)
[h20ln1:206  :0:206] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x5556227d8)
[h20ln1:207  :0:207] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55e0b0c75)
[h20ln1:203  :0:203] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55c7b7acb)
[h20ln1:204  :0:204] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55e823eb6)
==== backtrace (tid:    203) ====
 0 0x0000000000042520 __sigaction()  ???:0
 1 0x000000000001a0d6 ibv_dereg_mr()  ???:0
 2 0x000000000000cddc nvshmemt_ibrc_finalize()  :0
 3 0x0000000000220912 nvshmemi_transport_finalize()  ???:0
 4 0x00000000000b4859 nvshmemid_hostlib_finalize()  ???:0
 5 0x00000000001b2e7f nvshmemi_finalize()  ???:0
 6 0x0000000000055132 deep_ep::Buffer::~Buffer()  /sgl-workspace/DeepEP/csrc/deep_ep.cpp:106
 7 0x0000000000068e86 std::default_delete<deep_ep::Buffer>::operator()()  /usr/include/c++/11/bits/unique_ptr.h:85
 8 0x0000000000068e86 std::unique_ptr<deep_ep::Buffer, std::default_delete<deep_ep::Buffer> >::~unique_ptr()  /usr/include/c++/11/bits/unique_ptr.h:361
 9 0x0000000000068e86 pybind11::class_<deep_ep::Buffer>::dealloc()  /usr/local/lib/python3.10/dist-packages/torch/include/pybind11/pybind11.h:1926
10 0x0000000000516907 pybind11::detail::clear_instance()  :0
11 0x00000000005174d1 pybind11_object_dealloc()  :0
12 0x0000000000169b93 _Py_CheckFunctionResult()  ???:0
13 0x00000000001a2407 PyObject_DelItem()  ???:0
14 0x0000000000181370 PyMapping_Check()  ???:0
15 0x000000000018b6a3 _PyFunction_Vectorcall()  ???:0
16 0x0000000000177cf3 _PyEval_EvalFrameDefault()  ???:0
17 0x000000000018b66c _PyFunction_Vectorcall()  ???:0
18 0x0000000000177cf3 _PyEval_EvalFrameDefault()  ???:0
19 0x000000000018b66c _PyFunction_Vectorcall()  ???:0
20 0x0000000000175a74 _PyEval_EvalFrameDefault()  ???:0
21 0x000000000018b66c _PyFunction_Vectorcall()  ???:0
22 0x0000000000175a74 _PyEval_EvalFrameDefault()  ???:0
23 0x000000000018b66c _PyFunction_Vectorcall()  ???:0
24 0x000000000017592f _PyEval_EvalFrameDefault()  ???:0
25 0x000000000018b66c _PyFunction_Vectorcall()  ???:0
26 0x0000000000176b43 _PyEval_EvalFrameDefault()  ???:0
27 0x0000000000259f56 PyEval_EvalCode()  ???:0
28 0x0000000000259e26 PyEval_EvalCode()  ???:0
29 0x0000000000280808 PyUnicode_Tailmatch()  ???:0
30 0x000000000027b00f PyInit__collections()  ???:0
31 0x0000000000274d91 PyRun_StringFlags()  ???:0
32 0x0000000000274c41 PyRun_SimpleStringFlags()  ???:0
33 0x0000000000273f70 Py_RunMain()  ???:0
34 0x000000000024de6d Py_BytesMain()  ???:0
35 0x0000000000029d90 __libc_init_first()  ???:0
36 0x0000000000029e40 __libc_start_main()  ???:0
37 0x000000000024dd65 _start()  ???:0

@cong543 commented on GitHub (Jun 4, 2025): @yuan-luo ，May I ask if you have solved this problem? I encountered a similar problem ``` NVSHMEM_BOOTSTRAP_UID_SOCK_IFNAME=ens19f0 MASTER_ADDR=172.16.1.134 WORLD_SIZE=2 RANK=0 python DeepEP/tests/test_low_latency.py Allocating buffer size: 2115.111296 MB ... [rank 0] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.67 us, min_t=790.27 us, max_t=946.85 us [rank 6] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.48 us, min_t=784.70 us, max_t=946.30 us [rank 7] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.54 us, min_t=784.58 us, max_t=946.40 us [rank 3] Dispatch + combine bandwidth: 23.78 GB/s, avg_t=927.20 us, min_t=791.84 us, max_t=945.63 us [rank 5] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.46 us, min_t=791.14 us, max_t=944.67 us [rank 2] Dispatch + combine bandwidth: 23.78 GB/s, avg_t=927.33 us, min_t=789.38 us, max_t=949.34 us [rank 1] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.61 us, min_t=784.67 us, max_t=946.27 us [rank 4] Dispatch + combine bandwidth: 23.77 GB/s, avg_t=927.67 us, min_t=794.78 us, max_t=945.12 us [rank 0] Dispatch bandwidth: 38.82 GB/s, avg_t=193.48 us | Combine bandwidth: 43.14 GB/s, avg_t=336.98 us [rank 6] Dispatch bandwidth: 39.91 GB/s, avg_t=188.19 us | Combine bandwidth: 42.89 GB/s, avg_t=338.92 us [rank 3] Dispatch bandwidth: 39.87 GB/s, avg_t=188.42 us | Combine bandwidth: 42.96 GB/s, avg_t=338.36 us [rank 5] Dispatch bandwidth: 39.38 GB/s, avg_t=190.77 us | Combine bandwidth: 43.29 GB/s, avg_t=335.82 us [rank 4] Dispatch bandwidth: 39.14 GB/s, avg_t=191.90 us | Combine bandwidth: 43.23 GB/s, avg_t=336.27 us [rank 1] Dispatch bandwidth: 39.16 GB/s, avg_t=191.80 us | Combine bandwidth: 43.12 GB/s, avg_t=337.12 us [rank 7] Dispatch bandwidth: 39.87 GB/s, avg_t=188.41 us | Combine bandwidth: 43.00 GB/s, avg_t=338.03 us [rank 2] Dispatch bandwidth: 39.68 GB/s, avg_t=189.30 us | Combine bandwidth: 42.86 GB/s, avg_t=339.20 us [rank 7] Dispatch send/recv time: 35.53 us | Combine send/recv time: 40.60 us [rank 1] Dispatch send/recv time: 39.25 us | Combine send/recv time: 40.27 us [rank 2] Dispatch send/recv time: 36.21 us | Combine send/recv time: 41.88 us [rank 4] Dispatch send/recv time: 35.42 us | Combine send/recv time: 41.97 us [rank 6] Dispatch send/recv time: 34.60 us | Combine send/recv time: 40.50 us [rank 3] Dispatch send/recv time: 36.04 us | Combine send/recv time: 41.72 us [rank 0] Dispatch send/recv time: 38.82 us | Combine send/recv time: 40.93 us [rank 5] Dispatch send/recv time: 35.33 us | Combine send/recv time: 40.70 us [h20ln1:208 :0:208] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55cff010a) [h20ln1:205 :0:205] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x561bbbd70) [h20ln1:209 :0:209] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55f575575) [h20ln1:210 :0:210] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x5623a6133) [h20ln1:206 :0:206] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x5556227d8) [h20ln1:207 :0:207] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55e0b0c75) [h20ln1:203 :0:203] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55c7b7acb) [h20ln1:204 :0:204] Caught signal 11 (Segmentation fault: invalid permissions for mapped object at address 0x55e823eb6) ==== backtrace (tid: 203) ==== 0 0x0000000000042520 __sigaction() ???:0 1 0x000000000001a0d6 ibv_dereg_mr() ???:0 2 0x000000000000cddc nvshmemt_ibrc_finalize() :0 3 0x0000000000220912 nvshmemi_transport_finalize() ???:0 4 0x00000000000b4859 nvshmemid_hostlib_finalize() ???:0 5 0x00000000001b2e7f nvshmemi_finalize() ???:0 6 0x0000000000055132 deep_ep::Buffer::~Buffer() /sgl-workspace/DeepEP/csrc/deep_ep.cpp:106 7 0x0000000000068e86 std::default_delete<deep_ep::Buffer>::operator()() /usr/include/c++/11/bits/unique_ptr.h:85 8 0x0000000000068e86 std::unique_ptr<deep_ep::Buffer, std::default_delete<deep_ep::Buffer> >::~unique_ptr() /usr/include/c++/11/bits/unique_ptr.h:361 9 0x0000000000068e86 pybind11::class_<deep_ep::Buffer>::dealloc() /usr/local/lib/python3.10/dist-packages/torch/include/pybind11/pybind11.h:1926 10 0x0000000000516907 pybind11::detail::clear_instance() :0 11 0x00000000005174d1 pybind11_object_dealloc() :0 12 0x0000000000169b93 _Py_CheckFunctionResult() ???:0 13 0x00000000001a2407 PyObject_DelItem() ???:0 14 0x0000000000181370 PyMapping_Check() ???:0 15 0x000000000018b6a3 _PyFunction_Vectorcall() ???:0 16 0x0000000000177cf3 _PyEval_EvalFrameDefault() ???:0 17 0x000000000018b66c _PyFunction_Vectorcall() ???:0 18 0x0000000000177cf3 _PyEval_EvalFrameDefault() ???:0 19 0x000000000018b66c _PyFunction_Vectorcall() ???:0 20 0x0000000000175a74 _PyEval_EvalFrameDefault() ???:0 21 0x000000000018b66c _PyFunction_Vectorcall() ???:0 22 0x0000000000175a74 _PyEval_EvalFrameDefault() ???:0 23 0x000000000018b66c _PyFunction_Vectorcall() ???:0 24 0x000000000017592f _PyEval_EvalFrameDefault() ???:0 25 0x000000000018b66c _PyFunction_Vectorcall() ???:0 26 0x0000000000176b43 _PyEval_EvalFrameDefault() ???:0 27 0x0000000000259f56 PyEval_EvalCode() ???:0 28 0x0000000000259e26 PyEval_EvalCode() ???:0 29 0x0000000000280808 PyUnicode_Tailmatch() ???:0 30 0x000000000027b00f PyInit__collections() ???:0 31 0x0000000000274d91 PyRun_StringFlags() ???:0 32 0x0000000000274c41 PyRun_SimpleStringFlags() ???:0 33 0x0000000000273f70 Py_RunMain() ???:0 34 0x000000000024de6d Py_BytesMain() ???:0 35 0x0000000000029d90 __libc_init_first() ???:0 36 0x0000000000029e40 __libc_start_main() ???:0 37 0x000000000024dd65 _start() ???:0 ```

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