1. use `fence+relaxed` to replace `release` for fifo. `fence+relax` is
more efficient on A100
2. Update the deviceSyncer. Previous one cannot handle threadBlock
number change correctly. Use three counters to solve this issue. Reset
previous counter before sync on current counter.
3. Introduce relaxedWait which can be used with relaxedSignal for case
doesn't need guarantee the memory visibility
For mscclpp, to use nvls we require the buffer is allocated by
mscclpp::GpuBuffer. Due to cupy doesn't support bfloat16 yet, we export
the raw buffer to dlpack format.
User can use this feature to create buffer with type supported by
pytorch
```python
buffer = RawGpuBuffer(1024 * 2) # 2 for bfloat16
dl_pack = buffer.to_dlpack(str(torch.bfloat16))
tensor = torch.utils.dlpack.from_dlpack(dl_pack)
```
`nop` instruction is only for synchronization within the same
threadblock. Cross threadblock synchronization is handled by `barrier`
instruction. So insert `nop` only if the dependency is within the same
threadblock.
Documentation update:
*
[`docs/design/mscclpp-dsl.md`](diffhunk://#diff-02a69290fb3e02b8a069bf915fbf5266cfc2ac51c6e9ff8b5b19df51ed909b22L114-R114):
Updated the link to the examples folder to reflect the correct path.
New example script:
*
[`python/examples/allgather_allpairs_multinodes_packets.py`](diffhunk://#diff-ab42c16ecca0680d55b60b82a6913138c5fba4069b9c4493fbe8c72217fe54bcR1-R76):
Added a new example script demonstrating the allgather all-pairs
algorithm across multiple nodes using packet communication.
IR module improvements:
*
[`python/mscclpp/language/ir.py`](diffhunk://#diff-b025796b03fbbd9b2ca9aee2569547efa7a56101743bc4aa05661be0b52aeec9L470-R472):
Refined the sorting criteria for GPU instance channels and thread block
channels to include the channel type, ensuring a more accurate order.
Debugging enhancements:
*
[`src/executor/executor.cc`](diffhunk://#diff-60f7806d111e5cc12ded06358b5d5b09b8521e3858f182d8be81ac05147c535dR439-R441):
Added a debug log to indicate the start of communication collective
execution with details about the execution plan and collective.
*
[`src/include/debug.h`](diffhunk://#diff-24e5fda55e3712277be4bb99b3c348294a77ebd3046bfe716b74bdb32cd203dfR89):
Introduced a new debug log subsystem identifier `MSCCLPP_EXECUTOR` for
logging executor-related information.
First step to merge msccl-tools into mscclpp repo. In this step will
move all msccl related code, pass the current tests and do some
necessary refactor.
Add `mscclpp.language` module
Add `_InstructionOptimizer` and `DagOptimizer` class to optimize the dag
Add `DagLower` to lower dag to intermediate representation
Add documents for mscclpp.language
Remove msccl related code
* Renamed and moved mem alloc functions into the `mscclpp::detail::`
namespace (now `mscclpp::detail::gpuCalloc*<T>()`)
* Deprecated constructor-calling mem alloc functions
(`mscclpp::makeShared*<T>()` and `mscclpp::makeUnique*<T>()`)
* Added a new `mscclpp::GpuBuffer<T>()` class that should be used in
general for allocating communication buffers
* Added a new `mscclpp.utils.GpuBuffer` Python class that inherits
`cupy.ndarray` and allocates using `mscclpp::gpuMemAlloc`
* Renamed `mscclpp::memcpyCuda*<T>()` functions into
`mscclpp::gpuMemcpy*<T>()` for name consistency
* A few fixes in NVLS memory allocation
* Tackled minor compiler warnings
* Renamed `ProxyChannel` -> `BaseProxyChannel` and `SimpleProxyChannel`
-> `ProxyChannel`. It makes the interface more consistent by defining
channels to be associated with a certain src/dst memory region:
`ProxyChannel` as "sema + src/dst + fifo" and `SmChannel` as "sema +
src/dst". BaseProxyChannel is not associated with any memory regions, as
"sema + fifo".
* `ProxyChannelDeviceHandle` now inherits from
`BaseProxyChannelDeviceHandle`, instead of having one as a member.
- Support mote datatype for multicast operation
- Add new OP MULTI_LOAD_REDUCE_STORE to support NVLS
- Modify allocSharedPhysicalCuda, which return std::shared_ptr<T>
instead of std::shared_ptr<PhysicalCudaMemory>
- Add Python support for allocSharedPhysicalCuda
Test passed for `allreduce_nvls.json`
- Add C++ executor test
- Fix executor bugs for packet operation
- Enhance executor_test.py
---------
Co-authored-by: Binyang Li <binyli@microsoft.com>
This is needed in use cases where SimpleProxyChannel does not suffice.
For example, when a single semaphore is to be used for multiple tensors
or when multiple semaphores should be associated with a tensor.
