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Issues list

4090 with P2P, alltoall is too low
#1603 opened Feb 12, 2025 by artetaout
2
[Question] On data path of alltoall/alltoallv
#1601 opened Feb 11, 2025 by GHGmc2
2
Why is only part of the NICs used during allreduce, and why are inter-node connections not on the same rail even when I explicitly specify using all NICs?
#1600 opened Feb 11, 2025 by FortPercent
2
Potential bug in group.cc
#1599 opened Feb 8, 2025 by songhexiang
1
why NCCL_MAX_NCHANNELS cannot limit ncclDevKernel_SendRecv grid size
#1598 opened Feb 8, 2025 by Graham1025
7
Is there a relationship between ncclTopoSearchNextGpuSort and followPath
#1596 opened Feb 7, 2025 by zhangdexin
Question about algorithms used for all-gathers and reduce-scatters
#1594 opened Feb 5, 2025 by siddharth9820
4
Design question: what is comm->planner.tmpCollWorkQueue used for?
#1592 opened Jan 30, 2025 by YconquestY
Error while attaching to shared memory segment
#1589 opened Jan 25, 2025 by cassanof
1
In the scenario with two H20 nodes, each equipped with 16 GPU cards and 4 InfiniBand (IB) network cards per node, the bus bandwidth is only reaching 65Gbps.
#1588 opened Jan 24, 2025 by PaggyZhang
2
Potential buffer overflow issue in xml reader
#1585 opened Jan 21, 2025 by fishautumn
Getting NVLS user buffer registration to work under PyTorch
#1584 opened Jan 20, 2025 by lw
1
what does device network offload mean?
#1582 opened Jan 20, 2025 by kkndyu
NCCL Ignores Specified SOCKET_IFNAME Configuration on Worker Nodes in Multi-Node Setup
#1581 opened Jan 18, 2025 by rachid2198
5
NCCL_SOCKET_IFNAME has no effect during pytorch distributed training with multiple NICs
#1580 opened Jan 18, 2025 by hanruijiang
10
Question about post recv
#1577 opened Jan 17, 2025 by lpoyster
BusBW of 2-node tree-based Allreduce exceeds the theoretical limit
#1576 opened Jan 16, 2025 by JK-Jiagn
[Q] How to build nvidia-nccl whl package?
#1575 opened Jan 15, 2025 by kehuanfeng
nccl connection abort(between kubernetes pods): WARN NET/IB: read failed in ncclIbRoceGetVersionNum: Invalid argument
#1573 opened Jan 10, 2025 by limu713
8
nccl_max_nchannels dynamically set in the program
#1572 opened Jan 9, 2025 by Rainlin007
2
net.cc recvProxyConnect p2p buff set
#1570 opened Jan 9, 2025 by GeofferyGeng
Potential group\collective life-time management issue in profiler plugin.
#1569 opened Jan 9, 2025 by wiryls
2
How does the GPU that initiates the nvswitch broadcast know that the nvswitch has completed the broadcast operation?
#1568 opened Jan 8, 2025 by pengqianqian
Running issue with Nvidia NIM for NCCL.
#1567 opened Jan 7, 2025 by innat-asj
4
group launch allreduce + allgather
#1566 opened Jan 7, 2025 by alpha-baby
1
ProTip! Updated in the last three days: updated:>2025-02-10.