Comments (2)
NCCL1 is no longer being actively maintained. I suggest you try using the NCCL2 binary packages available from https://developer.nvidia.com/nccl
Using these will deliver much better performance and compatibility with the latest GPUs from Nvidia.
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Closing old issues. Please open another one if you are still seeing issues.
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Related Issues (20)
- AlltoAllGetBw is incorrect when used with multiple nodes HOT 1
- Although it is an InfiniBand environment, it seems that the average Bandwidth is not as good as expected. HOT 4
- Test NCCL failure common.cu:954 'unhandled cuda error" when test on >2 GPUs HOT 4
- Nsight Profiling: one ncclAllReduce takes too long
- misc/ibvwrap.cc:187 NCCL WARN Call to ibv_modify_qp failed with error Network is unreachable HOT 3
- how can i run nccl-test use max bandwidth
- NCCL alltoall_perf hangs via PXN HOT 1
- misc/socket.cc:441 NCCL WARN socketFinalizeAccept: wrong type 4 != 3 HOT 6
- hypercube out-of-bound errors with single-proc + `gpus-per-thread=4`, not with multi-proc + `gpus-per-thread=1` HOT 1
- nccl-tests result is only a half of ib_write_bw
- NCCL Test Does not work with GID 3 or GID 1, but it works fine for GID 0
- NCCL Test hang when the number of nodes goes beyond 18, and CPU usage is very high HOT 2
- all_reduce_perf between NVLINK connected H100 PCIe GPUs lower than A100 SXM4 GPUs
- undefined reference to ncclRedOpDestroy HOT 2
- busbw exceeds network bandwidth (2 nodes, 16 gpus, 100Gbps intel NIC, no NVSwitch) - what algorithm is used? HOT 5
- How to explain Bus Bandwidth in Allreduce Operation?
- How is the maximum number of bytes for all_reduce operation calculated? HOT 3
- Interaction between NCCL_IB_SL and NCCL_IB_ADAPTIVE_ROUTING
- Multi node test hang phenomenon HOT 2
- Performance lack of NCCL Test HOT 5
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