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Why nccl ring all reduce stream duration doesn't scales with theoretical (N-1)/N?
#1282
opened May 11, 2024 by
CraneQinghe
Why is allgather's busbw a little worse than allreduce/reducescatter for the same nccl environment variables
#1281
opened May 10, 2024 by
pkuleo
Seeking for some explanations on the meaning of terminology in nvtx.h
#1280
opened May 8, 2024 by
ZhiyiHu1999
Can ranks use different group patterns when calling P2P communication?
#1279
opened May 8, 2024 by
constroy
HGX 2-node test with different NIC topologies different network card names hangs, no results
#1277
opened May 8, 2024 by
superLiben
[BUG] NCCL2.20.5 meets "Message truncated : received 1024 bytes instead of 256" error while 2.18.5 not
#1273
opened Apr 30, 2024 by
shh2000
Only ~783GByte/s out of theoretical 900GB/s HGX H100 SXM Nvlink4
#1264
opened Apr 24, 2024 by
OrenLeung
Can two AllReduce operations run in parallel using different non-blocking cudaStreams?
#1262
opened Apr 23, 2024 by
lidoo233
When NCCL timeout happens, can the timeout rank print which ranks are not joining the collective?
#1260
opened Apr 22, 2024 by
bigning
all-reduce latency is lower with 2 nodes, 2 GPUs each vs. 2 nodes, 1 GPU each
#1250
opened Apr 13, 2024 by
nelson-liu
Question: "NCCL needs all GPUs of a host to be part of a collective in other to reliably use NVLinks"?
#1248
opened Apr 8, 2024 by
mkarrmann
2 node 16 H20 GPU allreduce performance is not as expected with NVL sharp
#1244
opened Apr 1, 2024 by
vickkylu
Theoretical time of collectives when reduction in network enabled
#1242
opened Apr 1, 2024 by
yupatrick22
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