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This commit is contained in:
Chenggang Zhao 2025-05-07 10:13:19 +08:00
parent 5272d40aaf
commit 159ba93ab3
1 changed files with 9 additions and 18 deletions
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25
deep_gemm/jit_kernels/gemm.py
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@ -72,13 +72,9 @@ def get_best_configs(m: int, n: int, k: int, num_groups: int, num_sms: int,
block_ms = (get_m_alignment_for_contiguous_layout(), )
block_ns = tuple(range(16, 129, 8)) + (144, 160, )
def fix_wave_saturate(x): return num_sms if x == 0 else x
def get_num_waves(bm, bn): return (ceil_div(
ceil_div(m, bm) * ceil_div(n, bn) * num_groups, num_sms) if bm else None)
def get_last_wave_util(bm, bn): return fix_wave_saturate(
(ceil_div(m, bm) * ceil_div(n, bn) * num_groups) % num_sms)
fix_wave_saturate = lambda x: num_sms if x == 0 else x
get_num_waves = lambda bm, bn: (ceil_div(ceil_div(m, bm) * ceil_div(n, bn) * num_groups, num_sms) if bm else None)
get_last_wave_util = lambda bm, bn: fix_wave_saturate((ceil_div(m, bm) * ceil_div(n, bn) * num_groups) % num_sms)
# Decide block sizes by waves
best_block_m, best_block_n = None, None
@ -86,8 +82,7 @@ def get_best_configs(m: int, n: int, k: int, num_groups: int, num_sms: int,
# NOTES: the block sizes cannot be too large, so at least one dim less than 128
for block_n in filter(lambda bn: block_m <= 128 or bn <= 128, block_ns):
success = False
num_waves, best_num_waves = get_num_waves(
block_m, block_n), get_num_waves(best_block_m, best_block_n)
num_waves, best_num_waves = get_num_waves(block_m, block_n), get_num_waves(best_block_m, best_block_n)
if best_block_m is None or best_block_n is None:
success = True
elif num_waves < best_num_waves:
@ -104,8 +99,7 @@ def get_best_configs(m: int, n: int, k: int, num_groups: int, num_sms: int,
success |= block_n == best_block_n and block_m < best_block_m
# Case 3: different for both `block_m` and `block_n`, `block_n` larger is better
success |= block_m != best_block_m and block_n > best_block_n
best_block_m, best_block_n = (block_m, block_n) if success else (
best_block_m, best_block_n)
best_block_m, best_block_n = (block_m, block_n) if success else (best_block_m, best_block_n)
assert best_block_m is not None and best_block_n is not None
# Always pick the longest one
@ -116,8 +110,7 @@ def get_best_configs(m: int, n: int, k: int, num_groups: int, num_sms: int,
# Unrolling both stages and `num_former_iters` will cause large code size
stage_candidates = (4, 3)
for num_stages in stage_candidates:
best_smem_config = get_smem_config(
num_stages, k, best_block_m, best_block_n)
best_smem_config = get_smem_config(num_stages, k, best_block_m, best_block_n)
if best_smem_config[0] <= sm90_capacity:
best_num_stages = num_stages
break
@ -141,10 +134,8 @@ def get_best_configs(m: int, n: int, k: int, num_groups: int, num_sms: int,
# Recompute the minimal number of SMs required
# NOTES: less L2 cache usage and less GPU frequency drop
num_waves = get_num_waves(best_block_m, best_block_n)
num_min_sms = ceil_div(ceil_div(m, best_block_m) *
ceil_div(n, best_block_n) * num_groups, num_waves)
num_min_sms = ceil_div(
num_min_sms, best_tma_multicast_config[0]) * best_tma_multicast_config[0]
num_min_sms = ceil_div(ceil_div(m, best_block_m) * ceil_div(n, best_block_n) * num_groups, num_waves)
num_min_sms = ceil_div(num_min_sms, best_tma_multicast_config[0]) * best_tma_multicast_config[0]
assert num_min_sms <= num_sms
return num_min_sms, best_block_m, best_block_n, best_num_stages, best_tma_multicast_config, best_smem_config