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.
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*************************************************************************
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* Copyright (c) 2017-2020, 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_COLLECTIVES_H_
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#define NCCL_COLLECTIVES_H_
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#define FUNC_INDEX_P2P 0
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#define FUNC_INDEX(func, redop, ncclType, al, pr) (1+(((((func)*ncclNumOps + (redop))*ncclNumTypes) + (ncclType))*NCCL_NUM_ALGORITHMS+(al))*NCCL_NUM_PROTOCOLS+(pr))
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#define NCCL_FUNC_NAME(func, algo, proto, redop, type) \
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ncclFunction_##func##_##algo##_##proto##_##redop##_##type
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#define NCCL_KERN_NAME(func, algo, proto, redop, type) \
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ncclKernel_##func##_##algo##_##proto##_##redop##_##type
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#define NCCL_IMPL_NAME(func, algo, proto) \
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nccl##func##algo##proto
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/* Declare all collective operations */
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#define DECL5(func, algo, proto, redop, type) \
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extern __device__ void NCCL_FUNC_NAME(func, algo, proto, redop, type)(struct ncclWorkElem* args); \
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extern __global__ void NCCL_KERN_NAME(func, algo, proto, redop, type)(struct ncclWorkElem c); \
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#define DECL4(func, algo, redop, type) \
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DECL5(func, algo, SIMPLE, redop, type) \
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DECL5(func, algo, LL, redop, type) \
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DECL5(func, algo, LL128, redop, type)
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#define DECL3(func, redop, type) \
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DECL4(func, RING, redop, type) \
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DECL4(func, TREE, redop, type) \
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DECL4(func, COLLNET, redop, type)
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#define DECL2(func, redop) \
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DECL3(func, redop, int8_t) \
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DECL3(func, redop, uint8_t) \
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DECL3(func, redop, int32_t) \
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DECL3(func, redop, uint32_t) \
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DECL3(func, redop, int64_t) \
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DECL3(func, redop, uint64_t) \
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DECL3(func, redop, half) \
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DECL3(func, redop, float) \
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DECL3(func, redop, double)
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#define DECL(func) \
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DECL2(func, Sum) \
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DECL2(func, Prod) \
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DECL2(func, Min) \
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DECL2(func, Max)
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#define DECL_ALL \
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DECL2(Broadcast, Sum) \
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DECL(Reduce) \
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DECL2(AllGather, Sum) \
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DECL(ReduceScatter) \
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DECL(AllReduce) \
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DECL5(SendRecv, RING, SIMPLE, Sum, int8_t) \
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DECL_ALL
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// CHUNKSIZE must be a multiple of SLICESIZE
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#define ALLREDUCE_SLICESTEPS (NCCL_STEPS/4)
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#define ALLREDUCE_CHUNKSTEPS (NCCL_STEPS/2)
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#define ALLGATHER_SLICESTEPS (NCCL_STEPS/4)
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#define ALLGATHER_CHUNKSTEPS (NCCL_STEPS/2)
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#define REDUCESCATTER_SLICESTEPS (NCCL_STEPS/4)
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#define REDUCESCATTER_CHUNKSTEPS (NCCL_STEPS/2)
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#define BROADCAST_SLICESTEPS 1
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#define BROADCAST_CHUNKSTEPS 1
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#define REDUCE_SLICESTEPS 1
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#define REDUCE_CHUNKSTEPS 1
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#define SENDRECV_SLICEFACTOR 4
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#endif
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