Comments (4)
nluehr
commented on June 18, 2024
A couple of questions. What GPUs are you using, and is NCCL being used to communicate between multiple processes (e.g. MPI ranks), or from within a single OS process?
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DL-Practise
commented on June 18, 2024
i use m40. and between multiple processes (MPI ranks). thanks very much
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nluehr
commented on June 18, 2024
The extra memory footprints should be eliminated in the latest change set.
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DL-Practise
commented on June 18, 2024
thanks
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Related Issues (20)
- Report of increased memory overhead during cudagraph capture with nccl >= 2.19 HOT 4
- "torch.distributed.DistBackendError: NCCL error" when using multiple nodes for training a larger LLM HOT 4
- ValueError: bytes must be in range(0, 256) HOT 8
- AllReduce Root Always 0 HOT 2
- Why get poor performance when using different channels with samechannels = 0?
- ncclSystemError: System call (e.g. socket, malloc) or external library call failed or device error. HOT 4
- NCCL error in: /opt/pytorch/pytorch/torch/csrc/distributed/c10d/ProcessGroupNCCL.cpp:1287, invalid usage, NCCL version 2.17.1 ncclInvalidUsage: This usually reflects invalid usage of NCCL library. Last error: Duplicate GPU detected : rank 2 and rank 3 both on CUDA device e2000 HOT 1
- Theoretical time of collectives when reduction in network enabled
- Questions about the memory order HOT 1
- 2 node 16 H20 GPU allreduce performance is not as expected with NVL sharp HOT 3
- Question about the use of tree algorithm in DGX A100 HOT 2
- AllReduce info.proto returns 0 (LL protocol) despite both setting env variable to SIMPLE / Tuning.cc protoEnable array disabling LL/LL128 HOT 5
- torch.distributed.DistBackendError: NCCL error in: /root/pytorch/torch/csrc/distributed/c10d/ProcessGroupNCCL.cpp:1333, internal error HOT 2
- Question: "NCCL needs all GPUs of a host to be part of a collective in other to reliably use NVLinks"?
- reduceCopy minSrcs and maxSrcs HOT 2
- all-reduce latency is lower with 2 nodes, 2 GPUs each vs. 2 nodes, 1 GPU each
- Leak in FIFO queue HOT 7
- Is this description of NCCL_BUFFSIZE's role appropriate? HOT 4
- nccl error for driver 535.161.08 HOT 2
- Question on Multi-Machine Topology Connection in NCCL HOT 1
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