Comments (1)
- We have an internal model which compares the performance of the different algorithms and (hopefully) chooses the best one.
- You're mixing up NCCL and MPI. The OMPI_ setting controls MPI and NCCL does not use MPI (even for inter-node communication). MPI is only used by the NCCL tests to spawn tasks and help with the CPU-CPU synchronization, but it's not required by NCCL, at all.
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Related Issues (20)
- alltoall_perf: each rank is only sending to half of the other ranks HOT 14
- stepbytes (increment size) argument does not support 1M notation HOT 1
- Test fail caused by ibvwrap.c:160 NCCL WARN Call to ibv_modify_qp failed with error Connection timed out. HOT 2
- has nvswitch, but uses 0 nvls channels HOT 3
- 2 Nodes nccl-test with mpi hangs HOT 1
- what is cu:990 error? how to solve this problem? HOT 5
- Test NCCL failure common.cu:997 'internal error HOT 9
- NCCL Tree allreduce test cannot reach the theoretical bus bandwidth on 2 nodes with 4 nics
- all_reduce_perf core dumped on 4 L20 HOT 21
- What's multi-allreduce ? HOT 1
- How do we comprehend the factor between algBw and busBw? HOT 5
- 2 Node Nccl Test don’t work HOT 7
- how to calculate the tree based allreduce ib bw?
- all_reduce algo factor for NVLink SHARP In network reductions
- AllReduce Bus Bandwidth decreases with larger network latency
- 2 Node Nccl Test don’t work for A100 HOT 4
- Test NCCL Hang HOT 2
- What does dma_buf do when gpuDirectRdma is disabled ? HOT 1
- NCCL_Algo=Tree HOT 1
- NCCL all-reduce test failure due to TL_SHM ERROR, This case was happened on containers on same server. HOT 2
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