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[CK_TILE] Optimize fmha splitkv & splitkv combine kernels (#1577)

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* Use smaller width for lse_accum dist tensor

* Update pipeline comment

* Fix wrong distribution for lse_accum

* Remove duplicate dim in lse_accum dist encoding

* Decide fmha splitkv combine kernel kBlockSize by kM0

* Remove assumption of MPerThread=1

* Add log<4> & log<8> specialization

* Enlarge occupancy array

* Fix vector size for small tile

* Add support for kMaxSplits=8

* Re-format gemm.hpp

* Use 16x16x16 warp gemm for fwd_splitkv

* Centralize policy code changes

* Leave fp8/bf8 tile settings unchanged
This commit is contained in:
Po Yen Chen
2024-10-21 10:52:11 +08:00
committed by GitHub
parent a285d6f9b5
commit 95e722a3b3
6 changed files with 96 additions and 48 deletions
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30
example/ck_tile/01_fmha/codegen/ops/fmha_fwd_splitkv.py
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@@ -191,7 +191,9 @@ using trait_{F_idx} = fmha_fwd_splitkv_combine_traits_<{F_hdim}, {F_dtype}, {F_m
template<>
void fmha_fwd_splitkv_combine_oneshot_<trait_{F_idx}>(const ck_tile::stream_config& s, fmha_fwd_splitkv_args a)
{{
if (a.num_splits <= 16) {{
if (a.num_splits <= 8) {{
kernel_runner<3>::run(s, a);
}} else if (a.num_splits <= 16) {{
kernel_runner<4>::run(s, a);
}} else if (a.num_splits <= 32) {{
kernel_runner<5>::run(s, a);
@@ -239,7 +241,7 @@ float fmha_fwd_splitkv(fmha_fwd_splitkv_traits t, fmha_fwd_splitkv_args a, const
FMHA_FWD_SPLITKV_API_INNER_DISPATCH=""" {F_if}((t.is_group_mode == {F_mode}) && (t.is_v_rowmajor == {F_vlayout}) && ({F_mask_check}) && (t.bias_type == {F_bias_check}) && (t.has_lse == {F_lse}) && (t.do_fp8_static_quant == {F_squant}) &&
((a.block_table_ptr != nullptr) == {F_pagedkv}) && ({F_scheck}) && ({F_skcheck}) && ({F_dcheck}) && ({F_dvcheck})) {{
using traits_ = fmha_fwd_splitkv_traits_<{F_hdim}, {F_dtype}, {F_mode}, {F_bm0}, {F_bn0}, {F_bk0}, {F_bn1}, {F_bk1}, {F_bk0blen}, {F_vlayout}, {F_pipeline_enum}, {F_mask}, {F_bias}, {F_lse}, {F_squant}, {F_pagedkv}, {F_spad}, {F_skpad}, {F_dpad}, {F_dvpad}>;
using traits2_ = fmha_fwd_splitkv_combine_traits_<{F_hdim}, {F_dtype}, {F_mode}, {F_bm0}/2, {F_bn1}, {F_lse}, {F_squant}, {F_spad}, {F_dvpad}>;
using traits2_ = fmha_fwd_splitkv_combine_traits_<{F_hdim}, {F_dtype}, {F_mode}, {F_bm0}/2, {F_bn1}/2, {F_lse}, {F_squant}, {F_spad}, {F_dvpad}>;
return fmha_fwd_splitkv_<traits_, traits2_>(s, a);
}}
@@ -551,14 +553,14 @@ class FmhaFwdSplitKVCombineKernel:
def get_fmha_fwd_tile_dict_from_dtype(dtype : str) -> Optional[dict]:
if dtype == 'fp16' or dtype == 'bf16':
return {
'32' : FmhaFwdTileSize(128, 64, 16, 32, 32, 32, 2, 1, 1, 32, 32, 16, -1),
'64' : FmhaFwdTileSize(128, 64, 32, 64, 32, 64, 4, 1, 1, 32, 32, 16, -1),
'128' : FmhaFwdTileSize(128, 128, 32, 128, 32, 128, 4, 1, 1, 32, 32, 16, -1),
'256' : FmhaFwdTileSize(128, 128, 32, 256, 32, 256, 4, 1, 1, 32, 32, 16, -1),
'32' : FmhaFwdTileSize(32, 64, 16, 32, 32, 32, 2, 1, 1, 16, 16, 16, -1),
'64' : FmhaFwdTileSize(64, 64, 32, 64, 32, 64, 4, 1, 1, 16, 16, 16, -1),
'128' : FmhaFwdTileSize(64, 128, 32, 128, 32, 128, 4, 1, 1, 16, 16, 16, -1),
'256' : FmhaFwdTileSize(64, 128, 32, 256, 32, 256, 4, 1, 1, 16, 16, 16, -1),
}
elif dtype == 'fp8' or dtype == 'bf8':
return {
'64' : FmhaFwdTileSize(128, 64, 32, 64, 32, 64, 2, 1, 1, 32, 32, 32, -1),
'64' : FmhaFwdTileSize(128, 64, 32, 64, 32, 64, 2, 1, 1, 32, 32, 32, -1),
'128' : FmhaFwdTileSize(128, 128, 32, 128, 32, 128, 4, 1, 1, 32, 32, 32, -1),
'256' : FmhaFwdTileSize(128, 128, 32, 256, 32, 256, 4, 1, 1, 32, 32, 32, -1)
}
@@ -568,16 +570,16 @@ def get_fmha_fwd_tile_dict_from_dtype(dtype : str) -> Optional[dict]:
def get_fmha_fwd_splitkv_combine_tile_dict_from_dtype(dtype : str) -> Optional[dict]:
if dtype == 'fp16' or dtype == 'bf16':
return {
'32' : FmhaFwdSplitKVCombineTileSize(64, 32, -1),
'64' : FmhaFwdSplitKVCombineTileSize(64, 64, -1),
'128' : FmhaFwdSplitKVCombineTileSize(64, 128, -1),
'256' : FmhaFwdSplitKVCombineTileSize(64, 256, -1),
'32' : FmhaFwdSplitKVCombineTileSize(16, 16, -1),
'64' : FmhaFwdSplitKVCombineTileSize(32, 32, -1),
'128' : FmhaFwdSplitKVCombineTileSize(32, 64, -1),
'256' : FmhaFwdSplitKVCombineTileSize(32, 128, -1),
}
elif dtype == 'fp8' or dtype == 'bf8':
return {
'64' : FmhaFwdSplitKVCombineTileSize(64, 64, -1),
'128' : FmhaFwdSplitKVCombineTileSize(64, 128, -1),
'256' : FmhaFwdSplitKVCombineTileSize(64, 256, -1),
'64' : FmhaFwdSplitKVCombineTileSize(64, 32, -1),
'128' : FmhaFwdSplitKVCombineTileSize(64, 64, -1),
'256' : FmhaFwdSplitKVCombineTileSize(64, 128, -1),
}
else:
return None