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perf(cake_dense_projection_det_gemm): plan the sm_103a 17408 -> 5120 and 12288 -> 4096 forwards with the row-half-release program at T-exact keys - #8737
This PR changes the Cake dense_projection_det_gemm package in flashinfer.experimental, the deterministic dense projection GEMM. Most programs in the package are BF16-operand GEMMs (forward, dgrad and wgrad), and one is an FP32 router GEMM. The package already ships the half-tail tall program with a column-grouped raster whose overlapped epilogue releases output by row half, built for sm_100a, sm_103a and sm_107a. This PR changes only the row rules. No kernel source or compiled library changes, and the package still has 275 compiled libraries. The PR plans this row-half-release program at 4 sm_103a row rules. Each rule applies at a single token count T. Two of these rules already exist and cover the 17408→5120 forward (BF16 output) at T 16231 and 16384. They used the overlapped half-tail program with the column-grouped raster in 12-column-tile groups. They now select the row-half-release program, still with 12-column-tile raster groups. This is the same rule that the sm_100a keys of this row already have. The two new rules cover the 12288→4096 forward (BF16 output) at T 16231 and 16384. They use 8-column-tile raster groups. Before this PR, that row used the overlapped half-tail program with 16-column-tile groups from the ragged rule. The rule count goes from 386 to 388 (sm_103a 108 → 110). The sm_100a and sm_107a rules are unchanged. The baseline is the previous Cake version of the package on main. On GB300 the 17408→5120 rows measure 1.010 at both T, and the 12288→4096 rows measure 1.014 and 1.013. On B300 the 17408→5120 rows measure 1.009 and 1.010, and the 12288→4096 rows measure 1.011 at both T. These are small gains of about 1 %, and no changed row is slower on either GPU. Every rule keeps the K split of the row's previous plan (whole K per output tile), so outputs on those rows are bitwise identical to main on both GPUs. All other rows of the 294-row shape list plan the same programs as main.
Speedup of this PR over the previous Cake version on main. GB300 (sm_103a, 152 SMs) and B300 (sm_103a, 148 SMs); only sm_103a rules change. CUDA 13.4, cold L2, BF16 output. Speedup = previous time / this PR time, and values above 1 mean this PR is faster.
GPU (arch, SMs)
layer (in→out)
op
out
T
previous µs
this PR µs
speedup
GB300 (sm_103a, 152)
17408→5120
forward
BF16
16231
1427.5
1413.8
1.010
GB300 (sm_103a, 152)
17408→5120
forward
BF16
16384
1430.1
1416.1
1.010
GB300 (sm_103a, 152)
12288→4096
forward
BF16
16231
823.9
813.0
1.014
GB300 (sm_103a, 152)
12288→4096
forward
BF16
16384
824.9
814.3
1.013
B300 (sm_103a, 148)
17408→5120
forward
BF16
16231
1576.6
1562.9
1.009
B300 (sm_103a, 148)
17408→5120
forward
BF16
16384
1578.9
1564.0
1.010
B300 (sm_103a, 148)
12288→4096
forward
BF16
16231
871.2
862.0
1.011
B300 (sm_103a, 148)
12288→4096
forward
BF16
16384
873.0
863.4
1.011
The package also ships FP32-output forms, weight-gradient (wgrad) programs and the FP32 router GEMM (run through BF16x3 emulation), on sm_100a, sm_103a and sm_107a.
Summary by CodeRabbit
Performance
Updated dense projection execution for selected workloads on sm_103a GPUs, including specific input and output dimensions at token counts of 16,231 and 16,384. These workloads now use a different execution strategy; results and supported configurations are unchanged.
…and 12288 -> 4096 forwards with the row-half-release program at T-exact keys
The row-half-release form of the half-tail tall program with the
column-grouped raster (dense_proj_det_gemm_kk_n256_m256_ht_cg_or_pro7,
the overlapped tall epilogue released by row half) ships for sm_100a,
sm_103a and sm_107a. This change plans it at four more sm_103a T-exact
keys:
- the 17408 -> 5120 forward at T 16231 / 16384 (2 keys, 12-column-tile
raster groups) moves from the column-chunk overlapped program to this
one, the rule of the sm_100a keys of the row;
- the 12288 -> 4096 forward at T 16231 / 16384 gains 2 keys
(8-column-tile raster groups) in place of the ragged rule's
overlapped half-tail program in 16-column-tile groups.
Each key keeps the per-tile K partitions of the row's plan without it
(whole K per output tile), so every output is bitwise equal to that
plan's; every other T, sm_100a and sm_107a are unchanged; no library
or source file changes; the rule count goes from 386 to 388.
Latency (us, previous plan -> this plan; cold L2, CUDA 13.4, median of
order-balanced passes; 0 slower passes on either board):
row GB300 (sm_103a) B300 (sm_103a)
17408 -> 5120 T16231 1427.5 -> 1413.8 1576.6 -> 1562.9
17408 -> 5120 T16384 1430.1 -> 1416.1 1578.9 -> 1564.0
12288 -> 4096 T16231 823.9 -> 813.0 871.2 -> 862.0
12288 -> 4096 T16384 824.9 -> 814.3 873.0 -> 863.4
Tests: the rule counts, the measured-rows table, and the GB T-exact
table (planner test: program, raster group, the K partitions of the
plan without the key, T +- 1 unchanged; device test: FP64 reference and
bitwise equality with the plan without the key).
@flashinfer-bot run tests/experimental/test_cake_dense_projection_det_gemm.py tests/experimental/test_cake_dense_projection_det_gemm_names.py tests/experimental/test_cake_dense_projection_gemm.py
The sm_103a T-exact forward rules for token counts 16231 and 16384 now select row-half-release programs for the specified shapes. The README and tests reflect the updated rules, program mappings, and raster groups.
The selected exact-shape rules use the row-half-release program with column-grouped raster widths of 12 or 8. The documentation and tests update the corresponding rules, expected mappings, and exact-key coverage.
flashinfer-ai/flashinfer#8719: This PR applies the row-half-release program to the corresponding sm_103a exact keys.
Suggested labels:run-ci
Merge Risk: Minimal · up to 8fd73
The updated rules retain the intended row-half-release program during normal planning. No actionable merge-blocking issue was identified; merge after normal checks pass.
Pre-merge checks: 3 · 2
Failed checks: 2 warnings
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The description gives a detailed and relevant summary, including affected rules, performance results, unchanged scope, and bitwise-output claims. However, it omits the required template sections for r…
Add the repository description template sections. Provide the related tracking issue, pre-commit results, test results, experimental-track checklist, intended hardware validation, and an experimental-tests fenced block containing the requir…
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Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 3 passed
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The title clearly identifies the package, affected sm_103a forward shapes, row-half-release program, and T-exact planning change.
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Add the repository description template sections. Provide the related tracking issue, pre-commit results, test results, experimental-track checklist, intended hardware validation, and an experimental-tests fenced block containing the required test target paths.
Full details: Docstring Coverage
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Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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This PR changes the Cake
dense_projection_det_gemmpackage inflashinfer.experimental, the deterministic dense projection GEMM. Most programs in the package are BF16-operand GEMMs (forward, dgrad and wgrad), and one is an FP32 router GEMM. The package already ships the half-tail tall program with a column-grouped raster whose overlapped epilogue releases output by row half, built forsm_100a,sm_103aandsm_107a. This PR changes only the row rules. No kernel source or compiled library changes, and the package still has 275 compiled libraries. The PR plans this row-half-release program at 4sm_103arow rules. Each rule applies at a single token count T. Two of these rules already exist and cover the 17408→5120 forward (BF16 output) at T 16231 and 16384. They used the overlapped half-tail program with the column-grouped raster in 12-column-tile groups. They now select the row-half-release program, still with 12-column-tile raster groups. This is the same rule that thesm_100akeys of this row already have. The two new rules cover the 12288→4096 forward (BF16 output) at T 16231 and 16384. They use 8-column-tile raster groups. Before this PR, that row used the overlapped half-tail program with 16-column-tile groups from the ragged rule. The rule count goes from 386 to 388 (sm_103a108 → 110). Thesm_100aandsm_107arules are unchanged. The baseline is the previous Cake version of the package on main. On GB300 the 17408→5120 rows measure 1.010 at both T, and the 12288→4096 rows measure 1.014 and 1.013. On B300 the 17408→5120 rows measure 1.009 and 1.010, and the 12288→4096 rows measure 1.011 at both T. These are small gains of about 1 %, and no changed row is slower on either GPU. Every rule keeps the K split of the row's previous plan (whole K per output tile), so outputs on those rows are bitwise identical to main on both GPUs. All other rows of the 294-row shape list plan the same programs as main.Speedup of this PR over the previous Cake version on main. GB300 (
sm_103a, 152 SMs) and B300 (sm_103a, 148 SMs); onlysm_103arules change. CUDA 13.4, cold L2, BF16 output. Speedup = previous time / this PR time, and values above 1 mean this PR is faster.The package also ships FP32-output forms, weight-gradient (wgrad) programs and the FP32 router GEMM (run through BF16x3 emulation), on
sm_100a,sm_103aandsm_107a.Summary by CodeRabbit