Nusrat Islam
fdf75fd2c1
This PR tunes the number of threadblocks used for larger (>1MB) message sizes.
27 строки
1.1 KiB
Diff
27 строки
1.1 KiB
Diff
diff --git a/apps/nccl/src/allreduce.hpp b/apps/nccl/src/allreduce.hpp
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index 7a2cd4a..a14dfbc 100644
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--- a/apps/nccl/src/allreduce.hpp
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+++ b/apps/nccl/src/allreduce.hpp
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@@ -850,7 +850,7 @@ cudaError_t allreduce(T* buff, T* scratch, T* resultBuff, mscclpp::DeviceHandle<
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flag++);
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#endif
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} else {
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- int nBlocks = 5*(nRanksPerNode - 1);
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+ int nBlocks = 8 * (nRanksPerNode - 1);
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int nThreadsPerBlock = 512;
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if (hieAllred && worldSize >= 8) {
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nBlocks = 20;
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diff --git a/apps/nccl/src/common.hpp b/apps/nccl/src/common.hpp
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index ca2c272..a6056ea 100644
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--- a/apps/nccl/src/common.hpp
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+++ b/apps/nccl/src/common.hpp
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@@ -17,7 +17,7 @@ constexpr int NRANKS1_PER_NODE = 4;
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constexpr int NRANKS_PER_NODE = 8;
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constexpr int NPEERS = 7;
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-constexpr int SCRATCH_SIZE = 2 * 1024 * 1024 * 70; // double buffer * 35 thread-blocks * 8 ranks * 256KB = 70MB
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+constexpr int SCRATCH_SIZE = 2 * 1024 * 1024 * 112; // double buffer * 56 thread-blocks * 8 ranks * 256KB = 112MB
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__device__ mscclpp::DeviceSyncer deviceSyncer;
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