Add prefetching kernel as new fallback for cub::DeviceTransform
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bernhardmgruber
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bernhardmgruber
commented
Sep 10, 2024
🟩 CI finished in 9h 50m: Pass: 100%/259 | Total: 1d 10h | Avg: 8m 02s | Max: 51m 35s | Hits: 99%/24441
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| Project | |
|---|---|
| CCCL Infrastructure | |
| libcu++ | |
| +/- | CUB |
| Thrust | |
| CUDA Experimental | |
| pycuda | |
| CUDA C Core Library |
Modifications in project or dependencies?
| Project | |
|---|---|
| CCCL Infrastructure | |
| libcu++ | |
| +/- | CUB |
| +/- | Thrust |
| CUDA Experimental | |
| +/- | pycuda |
| +/- | CUDA C Core Library |
🏃 Runner counts (total jobs: 259)
| # | Runner |
|---|---|
| 186 | linux-amd64-cpu16 |
| 42 | linux-amd64-gpu-v100-latest-1 |
| 16 | linux-arm64-cpu16 |
| 15 | windows-amd64-cpu16 |
ahendriksen
reviewed
Sep 16, 2024
| } \ | ||
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| if (tile_stride == tile_size) |
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Question: does the split between full_tile and partial tiles make a big difference in run time?
I expect that the difference shouldn't be too big, as the partial tile version only adds one comparison and predicates the rest of the computation.
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That is a good question! I followed existing practice here, but I see your point. I will evaluate!
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Here is a benchmark on H200:
Babelstream on H200 two code paths (baseline) vs. single code path
# mul
## [0] NVIDIA H200
| T{ct} | OffsetT{ct} | Elements{io} | Ref Time | Ref Noise | Cmp Time | Cmp Noise | Diff | %Diff | Status |
|---------|---------------|----------------|------------|-------------|------------|-------------|-----------|---------|----------|
| I8 | I32 | 2^16 | 3.964 us | 3.53% | 3.948 us | 2.92% | -0.016 us | -0.41% | PASS |
| I8 | I32 | 2^20 | 10.199 us | 1.88% | 10.266 us | 1.87% | 0.067 us | 0.65% | PASS |
| I8 | I32 | 2^24 | 22.588 us | 1.08% | 22.788 us | 1.11% | 0.200 us | 0.89% | PASS |
| I8 | I32 | 2^28 | 236.103 us | 0.15% | 238.034 us | 0.14% | 1.931 us | 0.82% | FAIL |
| I8 | I64 | 2^16 | 4.094 us | 3.64% | 4.114 us | 3.47% | 0.021 us | 0.51% | PASS |
| I8 | I64 | 2^20 | 10.245 us | 1.56% | 10.260 us | 1.47% | 0.015 us | 0.15% | PASS |
| I8 | I64 | 2^24 | 22.733 us | 1.09% | 22.792 us | 1.14% | 0.059 us | 0.26% | PASS |
| I8 | I64 | 2^28 | 237.687 us | 0.13% | 237.323 us | 0.14% | -0.363 us | -0.15% | FAIL |
| I16 | I32 | 2^16 | 4.133 us | 2.97% | 4.168 us | 2.64% | 0.035 us | 0.84% | PASS |
| I16 | I32 | 2^20 | 7.748 us | 2.16% | 7.838 us | 2.33% | 0.089 us | 1.15% | PASS |
| I16 | I32 | 2^24 | 25.688 us | 1.48% | 25.959 us | 1.46% | 0.271 us | 1.05% | PASS |
| I16 | I32 | 2^28 | 299.739 us | 0.12% | 303.418 us | 0.10% | 3.679 us | 1.23% | FAIL |
| I16 | I64 | 2^16 | 4.191 us | 2.98% | 4.198 us | 3.03% | 0.007 us | 0.16% | PASS |
| I16 | I64 | 2^20 | 7.925 us | 2.11% | 7.921 us | 2.21% | -0.004 us | -0.05% | PASS |
| I16 | I64 | 2^24 | 25.890 us | 1.39% | 25.933 us | 1.48% | 0.043 us | 0.17% | PASS |
| I16 | I64 | 2^28 | 300.617 us | 0.12% | 301.334 us | 0.10% | 0.717 us | 0.24% | FAIL |
| F32 | I32 | 2^16 | 4.108 us | 3.51% | 4.207 us | 3.29% | 0.100 us | 2.43% | PASS |
| F32 | I32 | 2^20 | 7.212 us | 2.63% | 7.398 us | 2.94% | 0.186 us | 2.58% | PASS |
| F32 | I32 | 2^24 | 38.193 us | 1.75% | 38.389 us | 1.59% | 0.196 us | 0.51% | PASS |
| F32 | I32 | 2^28 | 520.746 us | 0.15% | 522.979 us | 0.16% | 2.233 us | 0.43% | FAIL |
| F32 | I64 | 2^16 | 4.228 us | 4.57% | 4.325 us | 3.97% | 0.097 us | 2.29% | PASS |
| F32 | I64 | 2^20 | 7.264 us | 2.86% | 7.429 us | 2.98% | 0.165 us | 2.28% | PASS |
| F32 | I64 | 2^24 | 38.171 us | 1.62% | 38.409 us | 1.61% | 0.239 us | 0.63% | PASS |
| F32 | I64 | 2^28 | 521.283 us | 0.15% | 522.771 us | 0.16% | 1.488 us | 0.29% | FAIL |
| F64 | I32 | 2^16 | 4.387 us | 4.15% | 4.480 us | 3.78% | 0.093 us | 2.12% | PASS |
| F64 | I32 | 2^20 | 9.059 us | 2.89% | 9.198 us | 2.65% | 0.139 us | 1.54% | PASS |
| F64 | I32 | 2^24 | 67.603 us | 1.08% | 67.765 us | 1.06% | 0.161 us | 0.24% | PASS |
| F64 | I32 | 2^28 | 1.008 ms | 0.05% | 1.009 ms | 0.06% | 0.501 us | 0.05% | PASS |
| F64 | I64 | 2^16 | 4.516 us | 4.02% | 4.647 us | 5.02% | 0.130 us | 2.89% | PASS |
| F64 | I64 | 2^20 | 9.079 us | 2.79% | 9.217 us | 2.35% | 0.138 us | 1.52% | PASS |
| F64 | I64 | 2^24 | 67.634 us | 1.10% | 67.780 us | 1.07% | 0.147 us | 0.22% | PASS |
| F64 | I64 | 2^28 | 1.009 ms | 0.06% | 1.009 ms | 0.06% | 0.578 us | 0.06% | FAIL |
| I128 | I32 | 2^16 | 4.790 us | 4.22% | 4.934 us | 5.32% | 0.144 us | 3.00% | PASS |
| I128 | I32 | 2^20 | 12.903 us | 2.26% | 13.029 us | 2.36% | 0.126 us | 0.98% | PASS |
| I128 | I32 | 2^24 | 130.827 us | 0.64% | 130.909 us | 0.66% | 0.082 us | 0.06% | PASS |
| I128 | I32 | 2^28 | 2.030 ms | 0.14% | 2.031 ms | 0.14% | 0.725 us | 0.04% | PASS |
| I128 | I64 | 2^16 | 4.789 us | 3.89% | 4.788 us | 3.42% | -0.001 us | -0.01% | PASS |
| I128 | I64 | 2^20 | 12.949 us | 2.35% | 13.150 us | 3.15% | 0.200 us | 1.55% | PASS |
| I128 | I64 | 2^24 | 131.666 us | 0.73% | 131.626 us | 0.74% | -0.040 us | -0.03% | PASS |
| I128 | I64 | 2^28 | 2.032 ms | 0.41% | 2.033 ms | 0.41% | 0.144 us | 0.01% | PASS |
# add
## [0] NVIDIA H200
| T{ct} | OffsetT{ct} | Elements{io} | Ref Time | Ref Noise | Cmp Time | Cmp Noise | Diff | %Diff | Status |
|---------|---------------|----------------|------------|-------------|------------|-------------|-----------|---------|----------|
| I8 | I32 | 2^16 | 3.972 us | 2.69% | 4.055 us | 2.47% | 0.083 us | 2.09% | PASS |
| I8 | I32 | 2^20 | 7.763 us | 2.59% | 7.943 us | 2.18% | 0.179 us | 2.31% | FAIL |
| I8 | I32 | 2^24 | 26.937 us | 1.10% | 27.457 us | 1.05% | 0.521 us | 1.93% | FAIL |
| I8 | I32 | 2^28 | 300.779 us | 0.17% | 308.288 us | 0.16% | 7.509 us | 2.50% | FAIL |
| I8 | I64 | 2^16 | 4.136 us | 2.88% | 4.202 us | 2.87% | 0.066 us | 1.60% | PASS |
| I8 | I64 | 2^20 | 7.790 us | 2.26% | 7.934 us | 2.29% | 0.144 us | 1.84% | PASS |
| I8 | I64 | 2^24 | 27.023 us | 1.10% | 27.256 us | 1.10% | 0.234 us | 0.86% | PASS |
| I8 | I64 | 2^28 | 301.382 us | 0.11% | 308.000 us | 0.13% | 6.618 us | 2.20% | FAIL |
| I16 | I32 | 2^16 | 4.219 us | 2.79% | 4.305 us | 3.10% | 0.086 us | 2.03% | PASS |
| I16 | I32 | 2^20 | 7.193 us | 2.82% | 7.305 us | 2.80% | 0.112 us | 1.55% | PASS |
| I16 | I32 | 2^24 | 34.167 us | 1.71% | 34.630 us | 1.67% | 0.463 us | 1.36% | PASS |
| I16 | I32 | 2^28 | 444.715 us | 0.16% | 451.323 us | 0.15% | 6.607 us | 1.49% | FAIL |
| I16 | I64 | 2^16 | 4.242 us | 3.31% | 4.331 us | 3.11% | 0.090 us | 2.12% | PASS |
| I16 | I64 | 2^20 | 7.192 us | 2.76% | 7.344 us | 2.73% | 0.152 us | 2.12% | PASS |
| I16 | I64 | 2^24 | 34.275 us | 1.78% | 34.495 us | 1.73% | 0.220 us | 0.64% | PASS |
| I16 | I64 | 2^28 | 445.632 us | 0.15% | 449.233 us | 0.16% | 3.601 us | 0.81% | FAIL |
| F32 | I32 | 2^16 | 4.365 us | 2.98% | 4.601 us | 3.67% | 0.236 us | 5.40% | FAIL |
| F32 | I32 | 2^20 | 8.399 us | 2.74% | 8.559 us | 2.39% | 0.160 us | 1.90% | PASS |
| F32 | I32 | 2^24 | 54.969 us | 1.37% | 54.921 us | 1.37% | -0.048 us | -0.09% | PASS |
| F32 | I32 | 2^28 | 785.761 us | 0.09% | 789.161 us | 0.09% | 3.400 us | 0.43% | FAIL |
| F32 | I64 | 2^16 | 4.429 us | 4.19% | 4.704 us | 4.52% | 0.275 us | 6.21% | FAIL |
| F32 | I64 | 2^20 | 8.373 us | 2.40% | 8.546 us | 2.48% | 0.173 us | 2.07% | PASS |
| F32 | I64 | 2^24 | 55.000 us | 1.37% | 55.306 us | 1.37% | 0.307 us | 0.56% | PASS |
| F32 | I64 | 2^28 | 786.775 us | 0.08% | 790.047 us | 0.08% | 3.272 us | 0.42% | FAIL |
| F64 | I32 | 2^16 | 4.706 us | 3.67% | 4.801 us | 4.52% | 0.095 us | 2.01% | PASS |
| F64 | I32 | 2^20 | 11.428 us | 3.41% | 11.495 us | 2.49% | 0.066 us | 0.58% | PASS |
| F64 | I32 | 2^24 | 100.121 us | 0.39% | 100.326 us | 0.39% | 0.205 us | 0.20% | PASS |
| F64 | I32 | 2^28 | 1.508 ms | 0.05% | 1.509 ms | 0.05% | 0.855 us | 0.06% | FAIL |
| F64 | I64 | 2^16 | 4.804 us | 4.27% | 4.931 us | 4.97% | 0.126 us | 2.63% | PASS |
| F64 | I64 | 2^20 | 11.316 us | 2.47% | 11.444 us | 2.55% | 0.128 us | 1.13% | PASS |
| F64 | I64 | 2^24 | 100.004 us | 0.41% | 100.244 us | 0.39% | 0.240 us | 0.24% | PASS |
| F64 | I64 | 2^28 | 1.509 ms | 0.05% | 1.509 ms | 0.06% | 0.658 us | 0.04% | PASS |
| I128 | I32 | 2^16 | 5.227 us | 4.38% | 5.329 us | 4.78% | 0.102 us | 1.95% | PASS |
| I128 | I32 | 2^20 | 17.633 us | 2.22% | 17.680 us | 2.28% | 0.047 us | 0.27% | PASS |
| I128 | I32 | 2^24 | 194.202 us | 0.29% | 194.335 us | 0.29% | 0.133 us | 0.07% | PASS |
| I128 | I32 | 2^28 | 3.008 ms | 0.09% | 3.009 ms | 0.09% | 1.169 us | 0.04% | PASS |
| I128 | I64 | 2^16 | 5.164 us | 3.50% | 5.179 us | 3.29% | 0.014 us | 0.28% | PASS |
| I128 | I64 | 2^20 | 17.804 us | 2.52% | 17.788 us | 2.36% | -0.016 us | -0.09% | PASS |
| I128 | I64 | 2^24 | 195.061 us | 0.36% | 195.180 us | 0.38% | 0.119 us | 0.06% | PASS |
| I128 | I64 | 2^28 | 3.010 ms | 0.23% | 3.009 ms | 0.21% | -0.449 us | -0.01% | PASS |
# triad
## [0] NVIDIA H200
| T{ct} | OffsetT{ct} | Elements{io} | Ref Time | Ref Noise | Cmp Time | Cmp Noise | Diff | %Diff | Status |
|---------|---------------|----------------|------------|-------------|------------|-------------|-----------|---------|----------|
| I8 | I32 | 2^16 | 4.246 us | 3.71% | 4.226 us | 3.63% | -0.019 us | -0.45% | PASS |
| I8 | I32 | 2^20 | 7.839 us | 2.64% | 7.915 us | 2.36% | 0.075 us | 0.96% | PASS |
| I8 | I32 | 2^24 | 26.018 us | 1.33% | 26.417 us | 1.25% | 0.399 us | 1.53% | FAIL |
| I8 | I32 | 2^28 | 286.034 us | 0.15% | 294.496 us | 0.13% | 8.461 us | 2.96% | FAIL |
| I8 | I64 | 2^16 | 4.264 us | 3.84% | 4.301 us | 3.56% | 0.038 us | 0.88% | PASS |
| I8 | I64 | 2^20 | 7.958 us | 3.06% | 8.046 us | 3.02% | 0.088 us | 1.10% | PASS |
| I8 | I64 | 2^24 | 25.732 us | 1.25% | 25.935 us | 1.30% | 0.202 us | 0.79% | PASS |
| I8 | I64 | 2^28 | 314.272 us | 0.12% | 316.872 us | 0.21% | 2.600 us | 0.83% | FAIL |
| I16 | I32 | 2^16 | 4.327 us | 2.76% | 4.331 us | 3.10% | 0.004 us | 0.09% | PASS |
| I16 | I32 | 2^20 | 7.305 us | 2.79% | 7.410 us | 2.68% | 0.105 us | 1.44% | PASS |
| I16 | I32 | 2^24 | 34.765 us | 1.67% | 34.117 us | 1.75% | -0.647 us | -1.86% | FAIL |
| I16 | I32 | 2^28 | 425.006 us | 0.17% | 430.051 us | 0.17% | 5.045 us | 1.19% | FAIL |
| I16 | I64 | 2^16 | 4.373 us | 3.45% | 4.388 us | 3.47% | 0.015 us | 0.34% | PASS |
| I16 | I64 | 2^20 | 7.401 us | 3.11% | 7.397 us | 2.74% | -0.003 us | -0.04% | PASS |
| I16 | I64 | 2^24 | 33.826 us | 1.79% | 33.999 us | 1.75% | 0.174 us | 0.51% | PASS |
| I16 | I64 | 2^28 | 425.722 us | 0.17% | 428.301 us | 0.16% | 2.579 us | 0.61% | FAIL |
| F32 | I32 | 2^16 | 4.458 us | 3.71% | 4.407 us | 3.56% | -0.051 us | -1.14% | PASS |
| F32 | I32 | 2^20 | 8.391 us | 2.70% | 8.450 us | 2.82% | 0.059 us | 0.71% | PASS |
| F32 | I32 | 2^24 | 55.046 us | 1.33% | 55.285 us | 1.34% | 0.239 us | 0.43% | PASS |
| F32 | I32 | 2^28 | 773.132 us | 0.12% | 775.959 us | 0.11% | 2.828 us | 0.37% | FAIL |
| F32 | I64 | 2^16 | 4.484 us | 4.79% | 4.493 us | 4.85% | 0.009 us | 0.20% | PASS |
| F32 | I64 | 2^20 | 8.401 us | 2.66% | 8.494 us | 2.66% | 0.093 us | 1.11% | PASS |
| F32 | I64 | 2^24 | 55.101 us | 1.32% | 55.349 us | 1.32% | 0.248 us | 0.45% | PASS |
| F32 | I64 | 2^28 | 774.147 us | 0.12% | 776.581 us | 0.11% | 2.434 us | 0.31% | FAIL |
| F64 | I32 | 2^16 | 4.827 us | 3.95% | 4.810 us | 3.70% | -0.017 us | -0.35% | PASS |
| F64 | I32 | 2^20 | 11.340 us | 1.35% | 11.445 us | 2.54% | 0.105 us | 0.92% | PASS |
| F64 | I32 | 2^24 | 100.355 us | 0.43% | 100.262 us | 0.44% | -0.094 us | -0.09% | PASS |
| F64 | I32 | 2^28 | 1.509 ms | 0.05% | 1.509 ms | 0.06% | 0.636 us | 0.04% | PASS |
| F64 | I64 | 2^16 | 4.903 us | 5.42% | 4.947 us | 5.01% | 0.044 us | 0.90% | PASS |
| F64 | I64 | 2^20 | 11.371 us | 1.66% | 11.553 us | 3.20% | 0.182 us | 1.60% | PASS |
| F64 | I64 | 2^24 | 100.220 us | 0.43% | 100.266 us | 0.43% | 0.046 us | 0.05% | PASS |
| F64 | I64 | 2^28 | 1.509 ms | 0.06% | 1.509 ms | 0.06% | 0.494 us | 0.03% | PASS |
| I128 | I32 | 2^16 | 5.422 us | 4.90% | 5.422 us | 5.07% | 0.000 us | 0.00% | PASS |
| I128 | I32 | 2^20 | 17.905 us | 2.25% | 17.918 us | 2.14% | 0.013 us | 0.07% | PASS |
| I128 | I32 | 2^24 | 194.422 us | 0.30% | 194.603 us | 0.27% | 0.181 us | 0.09% | PASS |
| I128 | I32 | 2^28 | 3.007 ms | 0.09% | 3.010 ms | 0.09% | 2.715 us | 0.09% | FAIL |
| I128 | I64 | 2^16 | 5.202 us | 3.37% | 5.235 us | 4.08% | 0.032 us | 0.62% | PASS |
| I128 | I64 | 2^20 | 17.851 us | 2.39% | 17.837 us | 2.32% | -0.014 us | -0.08% | PASS |
| I128 | I64 | 2^24 | 194.996 us | 0.36% | 195.120 us | 0.34% | 0.124 us | 0.06% | PASS |
| I128 | I64 | 2^28 | 3.007 ms | 0.19% | 3.009 ms | 0.21% | 2.588 us | 0.09% | PASS |
# nstream
## [0] NVIDIA H200
| T{ct} | OffsetT{ct} | Elements{io} | OverwriteInput | Ref Time | Ref Noise | Cmp Time | Cmp Noise | Diff | %Diff | Status |
|---------|---------------|----------------|------------------|------------|-------------|------------|-------------|------------|---------|----------|
| I8 | I32 | 2^16 | 1 | 4.153 us | 3.08% | 4.072 us | 3.18% | -0.081 us | -1.95% | PASS |
| I8 | I32 | 2^20 | 1 | 7.199 us | 2.68% | 7.263 us | 2.30% | 0.065 us | 0.90% | PASS |
| I8 | I32 | 2^24 | 1 | 30.769 us | 1.27% | 31.748 us | 1.16% | 0.979 us | 3.18% | FAIL |
| I8 | I32 | 2^28 | 1 | 367.426 us | 0.15% | 387.490 us | 0.11% | 20.065 us | 5.46% | FAIL |
| I8 | I64 | 2^16 | 1 | 4.308 us | 2.83% | 4.194 us | 2.96% | -0.114 us | -2.64% | PASS |
| I8 | I64 | 2^20 | 1 | 7.247 us | 2.46% | 7.133 us | 2.63% | -0.114 us | -1.58% | PASS |
| I8 | I64 | 2^24 | 1 | 30.870 us | 1.22% | 30.982 us | 1.22% | 0.112 us | 0.36% | PASS |
| I8 | I64 | 2^28 | 1 | 369.782 us | 0.23% | 373.844 us | 0.13% | 4.062 us | 1.10% | FAIL |
| I16 | I32 | 2^16 | 1 | 4.440 us | 3.49% | 4.359 us | 2.92% | -0.081 us | -1.84% | PASS |
| I16 | I32 | 2^20 | 1 | 7.498 us | 2.97% | 7.485 us | 3.08% | -0.013 us | -0.18% | PASS |
| I16 | I32 | 2^24 | 1 | 42.648 us | 1.66% | 43.014 us | 1.60% | 0.367 us | 0.86% | PASS |
| I16 | I32 | 2^28 | 1 | 562.846 us | 0.13% | 572.306 us | 0.13% | 9.460 us | 1.68% | FAIL |
| I16 | I64 | 2^16 | 1 | 4.472 us | 3.73% | 4.376 us | 3.08% | -0.096 us | -2.14% | PASS |
| I16 | I64 | 2^20 | 1 | 7.528 us | 2.69% | 7.452 us | 3.06% | -0.077 us | -1.02% | PASS |
| I16 | I64 | 2^24 | 1 | 42.431 us | 1.67% | 42.550 us | 1.63% | 0.119 us | 0.28% | PASS |
| I16 | I64 | 2^28 | 1 | 560.706 us | 0.14% | 563.724 us | 0.09% | 3.018 us | 0.54% | FAIL |
| F32 | I32 | 2^16 | 1 | 4.452 us | 3.22% | 4.576 us | 3.21% | 0.124 us | 2.79% | PASS |
| F32 | I32 | 2^20 | 1 | 9.191 us | 2.85% | 9.327 us | 2.67% | 0.136 us | 1.48% | PASS |
| F32 | I32 | 2^24 | 1 | 70.198 us | 1.07% | 71.007 us | 1.02% | 0.809 us | 1.15% | FAIL |
| F32 | I32 | 2^28 | 1 | 1.021 ms | 0.21% | 1.036 ms | 0.19% | 15.479 us | 1.52% | FAIL |
| F32 | I64 | 2^16 | 1 | 4.519 us | 3.78% | 4.652 us | 4.58% | 0.133 us | 2.95% | PASS |
| F32 | I64 | 2^20 | 1 | 9.242 us | 2.80% | 9.355 us | 2.63% | 0.113 us | 1.22% | PASS |
| F32 | I64 | 2^24 | 1 | 70.674 us | 1.04% | 71.199 us | 1.02% | 0.524 us | 0.74% | PASS |
| F32 | I64 | 2^28 | 1 | 1.031 ms | 0.21% | 1.039 ms | 0.20% | 8.410 us | 0.82% | FAIL |
| F64 | I32 | 2^16 | 1 | 4.864 us | 4.07% | 5.022 us | 4.96% | 0.158 us | 3.25% | PASS |
| F64 | I32 | 2^20 | 1 | 13.639 us | 2.16% | 13.737 us | 1.61% | 0.098 us | 0.72% | PASS |
| F64 | I32 | 2^24 | 1 | 129.316 us | 0.65% | 133.768 us | 0.74% | 4.452 us | 3.44% | FAIL |
| F64 | I32 | 2^28 | 1 | 1.952 ms | 0.21% | 2.043 ms | 0.16% | 91.277 us | 4.68% | FAIL |
| F64 | I64 | 2^16 | 1 | 4.984 us | 4.54% | 5.129 us | 4.96% | 0.144 us | 2.90% | PASS |
| F64 | I64 | 2^20 | 1 | 13.639 us | 1.81% | 13.771 us | 1.87% | 0.132 us | 0.97% | PASS |
| F64 | I64 | 2^24 | 1 | 130.536 us | 0.64% | 133.817 us | 0.74% | 3.280 us | 2.51% | FAIL |
| F64 | I64 | 2^28 | 1 | 1.982 ms | 0.10% | 2.040 ms | 0.22% | 57.276 us | 2.89% | FAIL |
| I128 | I32 | 2^16 | 1 | 5.508 us | 4.58% | 5.697 us | 5.21% | 0.189 us | 3.43% | PASS |
| I128 | I32 | 2^20 | 1 | 21.720 us | 2.16% | 21.817 us | 2.20% | 0.097 us | 0.45% | PASS |
| I128 | I32 | 2^24 | 1 | 251.228 us | 0.40% | 258.446 us | 0.41% | 7.218 us | 2.87% | FAIL |
| I128 | I32 | 2^28 | 1 | 3.907 ms | 0.09% | 4.042 ms | 0.08% | 135.477 us | 3.47% | FAIL |
| I128 | I64 | 2^16 | 1 | 5.471 us | 3.86% | 5.409 us | 3.47% | -0.063 us | -1.15% | PASS |
| I128 | I64 | 2^20 | 1 | 21.859 us | 2.20% | 21.719 us | 2.19% | -0.140 us | -0.64% | PASS |
| I128 | I64 | 2^24 | 1 | 260.256 us | 0.38% | 258.323 us | 0.43% | -1.933 us | -0.74% | FAIL |
| I128 | I64 | 2^28 | 1 | 4.074 ms | 0.08% | 4.043 ms | 0.09% | -30.665 us | -0.75% | FAIL |
# Summary
- Total Matches: 160
- Pass (diff <= min_noise): 117
- Unknown (infinite noise): 0
- Failure (diff > min_noise): 43
While the change seems to not matter in most cases, I see a few regressions, especially on the large problem sizes and with nstream.
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This PR is ready from my point of view :) |
7 tasks
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miscco
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| } | ||
|
|
||
| // overload for any iterator that is not a pointer, do nothing | ||
| template <int, typename It, ::cuda::std::__enable_if_t<!::cuda::std::is_pointer<It>::value, int> = 0> |
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Suggestion: We could use cuda::std::contiguous_iterator in C++17 onwards.
Definitely something for a followup
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Added a note.
Comment on lines
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| auto determine_config = [&]() -> PoorExpected<prefetch_config> { | ||
| int max_occupancy = 0; | ||
| const auto error = CubDebug(MaxSmOccupancy(max_occupancy, CUB_DETAIL_TRANSFORM_KERNEL_PTR, block_dim, 0)); | ||
| if (error != cudaSuccess) | ||
| { | ||
| return error; | ||
| } | ||
| const auto sm_count = get_sm_count(); | ||
| if (!sm_count) | ||
| { | ||
| return sm_count.error; | ||
| } | ||
| return prefetch_config{max_occupancy, *sm_count}; | ||
| }; |
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Could this rather be a struct than a lambda, afaik the only thing that is needed is block_dim which is a static property
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Discusses offline. We could move the lambda outside the surrounding function, but determined it's more a style question than correctness. We then dediced to leave it as is to stay consistent with the way the ublkcp kernel configuration is written.
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This was referenced Oct 30, 2024
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The new prefetching kernel tunes it's number of elements per thread at runtime to reach an architecture-specific number of bytes in flight. It is based on work by @ahendriksen and adapted in the following ways:
cub::DeviceForfor problem sizes around 2^16 elements.The new prefetching kernel replaces the current fallback to
cub::DeviceForin the tuning policies (the fallback implementation is not yet removed. Will be done in a separate PR).Babelstream on H100 fallback_for vs prefetch
Performance requirements:
Average perf diff across all Babelstream kernels on 2^24+ problem sizes on H100
Fixes: #2363