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2.8.3-1

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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.


[ROCm/rccl commit: 920dbe5b35]
This commit is contained in:
Sylvain Jeaugey
2020-09-04 14:35:05 -07:00
parent 0277094dd2
commit a8908b34ee
90 changed files with 11172 additions and 3209 deletions
Download Patch File Download Diff File Expand all files Collapse all files
projects/rccl/src/include/collectives.h
+42 -39
View File
@@ -8,55 +8,58 @@
#define NCCL_COLLECTIVES_H_
#define FUNC_INDEX_P2P 0
#define FUNC_INDEX(coll, redop, dtype, al, pr) (1+(((((coll)*ncclNumOps + (redop))*ncclNumTypes) + (dtype))*NCCL_NUM_ALGORITHMS+(al))*NCCL_NUM_PROTOCOLS+(pr))
#define FUNC_INDEX(func, redop, ncclType, al, pr) (1+(((((func)*ncclNumOps + (redop))*ncclNumTypes) + (ncclType))*NCCL_NUM_ALGORITHMS+(al))*NCCL_NUM_PROTOCOLS+(pr))
#define NCCL_COLL_NAME(coll, op, dtype) \
coll##_##op##_##dtype
#define NCCL_FUNC_NAME(func, algo, proto, redop, type) \
ncclFunction_##func##_##algo##_##proto##_##redop##_##type
#define NCCL_KERN_NAME(coll, op, dtype) \
coll##Kernel_##op##_##dtype
#define NCCL_KERN_NAME(func, algo, proto, redop, type) \
ncclKernel_##func##_##algo##_##proto##_##redop##_##type
#define NCCL_IMPL_NAME(func, algo, proto) \
nccl##func##algo##proto
/* Declare all collective operations */
#define DECL_COLL5(coll, op, dtype) \
extern __device__ void NCCL_COLL_NAME(coll, op, dtype)(struct CollectiveArgs* args); \
extern __global__ void NCCL_KERN_NAME(coll, op, dtype)(struct ncclColl c); \
#define DECL5(func, algo, proto, redop, type) \
extern __device__ void NCCL_FUNC_NAME(func, algo, proto, redop, type)(struct ncclWorkElem* args); \
extern __global__ void NCCL_KERN_NAME(func, algo, proto, redop, type)(struct ncclWorkElem c); \
#define DECL_COLL4(coll, op, dtype) \
DECL_COLL5(coll, op, dtype) \
DECL_COLL5(coll##LL, op, dtype) \
DECL_COLL5(coll##LL128, op, dtype)
#define DECL4(func, algo, redop, type) \
DECL5(func, algo, SIMPLE, redop, type) \
DECL5(func, algo, LL, redop, type) \
DECL5(func, algo, LL128, redop, type)
#define DECL_COLL3(coll, op, dtype) \
DECL_COLL4(coll##Ring, op, dtype) \
DECL_COLL4(coll##Tree, op, dtype) \
DECL_COLL4(coll##CollNet, op, dtype)
#define DECL3(func, redop, type) \
DECL4(func, RING, redop, type) \
DECL4(func, TREE, redop, type) \
DECL4(func, COLLNET, redop, type)
#define DECL_COLL2(coll, op) \
DECL_COLL3(coll, op, i8) \
DECL_COLL3(coll, op, u8) \
DECL_COLL3(coll, op, i32) \
DECL_COLL3(coll, op, u32) \
DECL_COLL3(coll, op, i64) \
DECL_COLL3(coll, op, u64) \
DECL_COLL3(coll, op, f16) \
DECL_COLL3(coll, op, f32) \
DECL_COLL3(coll, op, f64)
#define DECL2(func, redop) \
DECL3(func, redop, int8_t) \
DECL3(func, redop, uint8_t) \
DECL3(func, redop, int32_t) \
DECL3(func, redop, uint32_t) \
DECL3(func, redop, int64_t) \
DECL3(func, redop, uint64_t) \
DECL3(func, redop, half) \
DECL3(func, redop, float) \
DECL3(func, redop, double)
#define DECL_COLL(coll) \
DECL_COLL2(coll, sum) \
DECL_COLL2(coll, prod) \
DECL_COLL2(coll, min) \
DECL_COLL2(coll, max)
#define DECL(func) \
DECL2(func, Sum) \
DECL2(func, Prod) \
DECL2(func, Min) \
DECL2(func, Max)
#define DECL_ALL_COLLS \
DECL_COLL2(ncclBroadcast, copy) \
DECL_COLL(ncclReduce) \
DECL_COLL2(ncclAllGather, copy) \
DECL_COLL(ncclReduceScatter) \
DECL_COLL(ncclAllReduce) \
DECL_COLL5(ncclSendRecv,copy,i8) \
#define DECL_ALL \
DECL2(Broadcast, Sum) \
DECL(Reduce) \
DECL2(AllGather, Sum) \
DECL(ReduceScatter) \
DECL(AllReduce) \
DECL5(SendRecv, RING, SIMPLE, Sum, int8_t) \
DECL_ALL_COLLS
DECL_ALL
// CHUNKSIZE must be a multiple of SLICESIZE
#define ALLREDUCE_SLICESTEPS (NCCL_STEPS/4)