Sylvain Jeaugey
920dbe5b35
Optimization for Tree allreduce on A100. Improve aggregation performance. Use shared buffers for inter-node send/recv. Add NVTX profiling hooks. Accelerate alltoall connections by merging communication for all channels. Add support for one hop communication through NVLink, for faster send/recv communication on cubemesh topologies like DGX-1. Improve alltoall scheduling to better balance intra/inter node communication. Increase send/recv parallelism by 8x, each warp sending or receiving to a different peer. Net: move to v4. Net: make flush operation asynchronous to accelerate alltoall. Net: define maximum number of requests. Fix hang when using LL128 protocol after 2^31 steps. Fix #379 : topology injection failing when using less GPUs than described in the XML. Fix #394 : protocol mismatch causing hangs or crashes when using one GPU per node.
14 строки
574 B
C
14 строки
574 B
C
/*************************************************************************
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* Copyright (c) 2015-2020, NVIDIA CORPORATION. All rights reserved.
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*
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* See LICENSE.txt for license information
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************************************************************************/
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#ifndef NCCL_TREES_H_
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#define NCCL_TREES_H_
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ncclResult_t ncclGetBtree(int nranks, int rank, int* u0, int* d1, int* d0, int* parentChildType);
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ncclResult_t ncclGetDtree(int nranks, int rank, int* u0, int* d0_0, int* d0_1, int* parentChildType0, int* u1, int* d1_0, int* d1_1, int* parentChildType1);
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#endif
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