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[CK_TILE] Add host-side Pack-GQA optimization for FMHA forward (#6533) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [CK_TILE] Add host-side Pack-GQA optimization for FMHA forward ## Motivation Host-side Pack-GQA optimization for CK-Tile FMHA forward. Reshapes Q tensor from `[b, nhead_q, seqlen_q, d]` to `[b, nhead_kv, nhead_ratio * seqlen_q, d]` by adjusting strides, so grouped Q-heads sharing the same KV data are processed in a single tile. Zero kernel changes — runner-only. Phase 1: non-causal attention with GQA ratio packing. Phase 2: extends to dropout and split-kv paths, fixes stride edge cases. ## Technical Details Modified files (2): - `example/ck_tile/01_fmha/example_fmha_fwd.cpp` — Pack-GQA flag plumbing - `example/ck_tile/01_fmha/fmha_fwd_runner.hpp` — Q tensor reshape logic, stride adjustment for GQA ratio packing New files (1): - `example/ck_tile/01_fmha/test_pack_gqa_phase2.sh` — 53 test cases covering non-causal, dropout, split-kv, various GQA ratios ## Dependencies None — this PR is standalone. ## Test Plan - GPU validation on MI300X (gfx942, ROCm 6.4.1): - Command: `./build/bin/tile_example_fmha_fwd -b=2 -h=32 -h_k=8 -s=2048 -d=128 -prec=bf16 -mode=group -v=1 -warmup=1 -repeat=3` - GPU validation on MI350X (gfx950, ROCm 7.0), 53 parameterized test cases: - Command (GQA 4:1): `./build/bin/tile_example_fmha_fwd -b=2 -h=32 -h_k=8 -s=2048 -d=128 -prec=bf16 -mode=group -v=1 -warmup=1 -repeat=3` - Command (GQA 8:1): `./build/bin/tile_example_fmha_fwd -b=2 -h=64 -h_k=8 -s=2048 -d=128 -prec=bf16 -mode=group -v=1 -warmup=1 -repeat=3` - Command (decode): `./build/bin/tile_example_fmha_fwd -b=64 -h=32 -h_k=8 -s=1 -s_k=4096 -d=128 -prec=bf16 -mode=group -v=1 -warmup=1 -repeat=3` ## Test Result Benchmark results (MI350X, gfx950, ROCm 7.0): | Config | Without Pack | With Pack | Improvement | |--------|-------------|-----------|-------------| | GQA 4:1 prefill b=2 h=32 hk=8 s=2048 d=128 bf16 | 690.05 TFlops (0.199 ms) | 695.61 TFlops (0.198 ms) | +0.8% | | GQA 8:1 prefill b=2 h=64 hk=8 s=2048 d=128 bf16 | 706.25 TFlops (0.389 ms) | 729.35 TFlops (0.377 ms) | +3.3% | | GQA 8:1 decode b=64 h=32 hk=4 s_k=4096 d=128 bf16 | 305.20 GB/s (1.763 ms) | 1813.41 GB/s (0.297 ms) | **+5.9x** | | LLaMA-70B decode b=32 h=64 hk=8 s_k=4096 d=128 bf16 | 591.70 GB/s (0.909 ms) | 1820.65 GB/s (0.295 ms) | **+3.1x** | | MHA ratio=1 b=2 h=8 s=4096 d=128 bf16 | 695.16 TFlops | 702.72 TFlops | no regression | Benchmark results (MI300X, gfx942, ROCm 6.4.1): No regression on MI300X. Pack-GQA is a runner-only optimization (zero kernel changes), performance impact is within noise on MI300X. | Config | TFlops / GB/s | Time (ms) | Delta vs baseline | |--------|-------------|-----------|-------------------| | MHA bf16 b=2 h=8 s=4096 d=128 | 336.52 TFlops | 0.408 | -1.7% | | GQA 4:1 bf16 b=2 h=32 hk=8 s=2048 d=128 | 322.52 TFlops | 0.426 | -0.7% | | GQA 8:1 bf16 b=2 h=64 hk=8 s=2048 d=128 | 349.85 TFlops | 0.786 | +0.5% | | LLaMA-70B prefill b=1 h=64 hk=8 s=4096 d=128 bf16 | 381.29 TFlops | 1.442 | +1.2% | | Decode b=64 h=32 hk=8 s_k=4096 d=128 bf16 | 697.32 GB/s | 1.541 | +0.8% | All validation tests pass (`valid:y`) on both MI300X and MI350X. Additional validation: - 53 parameterized test cases pass (23 phase 1 + 30 phase 2) - GQA ratios tested: 1:1, 2:1, 4:1, 8:1, 32:1 - No regression on MHA (ratio=1) workloads - fp16 and bf16 validated
CK Tile Testing Guide
This document describes the test organization and available test targets for CK Tile operations.
Overview
CK Tile tests are organized with multiple levels of granularity to support different development workflows:
- Global test labels - Run tests across all operations
- Operation-specific umbrella targets - Run all tests for a specific operation
- Individual test executables - Run specific tests
Global Test Labels
These targets run tests across all CK operations (not just CK Tile):
ninja smoke
Run fast smoke tests (tests that complete within ~30 seconds on gfx90a).
ninja smoke
ninja regression
Run slower, more comprehensive regression tests.
ninja regression
ninja check
Run ALL available tests in the entire codebase.
ninja check
Operation-Specific Umbrella Targets
These targets allow you to run all tests for a specific CK Tile operation. This is useful when making changes to a particular operation and wanting to validate all related tests without running the entire test suite.
GEMM Operations
ck_tile_gemm_tests
Run all basic GEMM pipeline tests (memory, compute variants, persistent, etc.)
ninja ck_tile_gemm_tests
Test executables included:
test_ck_tile_gemm_pipeline_memtest_ck_tile_gemm_pipeline_compv3test_ck_tile_gemm_pipeline_compv4test_ck_tile_gemm_pipeline_persistenttest_ck_tile_gemm_pipeline_compv6test_ck_tile_gemm_pipeline_comp_async(gfx95 only)test_ck_tile_gemm_pipeline_*_wmmavariants (gfx11/gfx12 only)
ck_tile_gemm_block_scale_tests
Run all GEMM tests with block-scale quantization (AQuant, BQuant, ABQuant, etc.)
ninja ck_tile_gemm_block_scale_tests
Test executables included: 29 test executables covering:
- AQuant tests (memory pipelines, base layouts, prefill, preshuffle, transpose)
- ABQuant tests (base, padding, preshuffle)
- BQuant tests (1D/2D variants, transpose)
- BQuant with PreshuffleB (decode/prefill, 1D/2D)
- BQuant with PreshuffleQuant (decode/prefill, 1D/2D)
- RowColQuant and TensorQuant tests
ck_tile_gemm_streamk_tests
Run all GEMM StreamK tests (tile partitioner, reduction, smoke, extended)
ninja ck_tile_gemm_streamk_tests
Test executables included:
test_ck_tile_streamk_tile_partitionertest_ck_tile_streamk_reductiontest_ck_tile_streamk_smoketest_ck_tile_streamk_extended
ck_tile_grouped_gemm_quant_tests
Run all grouped GEMM quantization tests
ninja ck_tile_grouped_gemm_quant_tests
Test executables included:
test_ck_tile_grouped_gemm_quant_rowcoltest_ck_tile_grouped_gemm_quant_tensortest_ck_tile_grouped_gemm_quant_aquanttest_ck_tile_grouped_gemm_quant_bquanttest_ck_tile_grouped_gemm_quant_bquant_preshuffleb
Other Operations
ck_tile_fmha_tests
Run all FMHA (Flash Multi-Head Attention) tests
ninja ck_tile_fmha_tests
Test executables included: Forward and backward tests for fp16, bf16, fp8bf16, fp32
ck_tile_reduce_tests
Run all reduce operation tests
ninja ck_tile_reduce_tests
Test executables included:
test_ck_tile_reduce2dtest_ck_tile_multi_reduce2d_threadwisetest_ck_tile_multi_reduce2d_multiblock
Individual Test Executables
You can also build and run individual test executables:
Build a specific test
ninja test_ck_tile_gemm_pipeline_mem
Run a specific test directly
./build/bin/test_ck_tile_gemm_pipeline_mem
Run a specific test through ctest
ctest -R test_ck_tile_gemm_pipeline_mem --output-on-failure