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[Bug]: ncclAllReduce deadlocks on 2x RTX 5880 Ada (PCIe PHB topology, no NVLink)

Status: Open.

#2079 In NVIDIA/nccl;

· zeryx opened on Mar 30, 2026

[RFE]: Finer control over CTA count, QPS_PER_CONNECTION etc per communication protocol

enhancement

Status: Open.

#2078 In NVIDIA/nccl;

· ngoyal2707 opened on Mar 30, 2026

NCCL 2.29.7: NVLS multicast slot exhaustion causes fatal error instead of graceful fallback

Status: Open.

#2077 In NVIDIA/nccl;

· subinz1 opened on Mar 30, 2026

[Issue]: torch.distributed.DistBackendError: NCCL error in: /opt/conda/conda-bld/pytorch_1729647429097/work/torch/csrc/distributed/c10d/NCCLUtils.hpp:317, remote process exited or there was a network error, NCCL version 2.21.5

Status: Open.

#2076 In NVIDIA/nccl;

· lorsonblair opened on Mar 29, 2026

[Question]: A question about nccl_ep

Status: Open.

#2074 In NVIDIA/nccl;

· Sailing2TheMoon opened on Mar 27, 2026

[Question]: is the ring algorithm in cclSymkRun_AllGather_RailRing_LsaSTMC good enough？

question

Status: Open.

#2073 In NVIDIA/nccl;

· strongwind312 opened on Mar 27, 2026

[RFE]: nvls/symmetric multimem algorithm optimization

enhancement

Status: Open.

#2072 In NVIDIA/nccl;

· visualxu opened on Mar 26, 2026

[Question]: When the NIC delivers a completion to the CPU, Is there possibility the pcie wr tlp still in pcie switch, and might be later than gdrcopy's read?

question

Status: Open.

#2071 In NVIDIA/nccl;

· jams99 opened on Mar 26, 2026

[Question]: why use (1<<30)/1.e6 as GBps when symmetric pick kernel int func queryModel_lsa

question

Status: Open.

#2069 In NVIDIA/nccl;

· wanggeng09825 opened on Mar 26, 2026

[Question]: is "Symmetric Memory Support for Network" supported now ?

question

Status: Open.

#2065 In NVIDIA/nccl;

· strongwind312 opened on Mar 24, 2026

[Question]: Applying NCCL EP to vLLM

question

Status: Open.

#2063 In NVIDIA/nccl;

· llsj14 opened on Mar 23, 2026

[Issue]: Potential BUG: Memory Visibility and Race Condition in bootstrapNetInit (Identified by RustCC)

Status: Open.

#2062 In NVIDIA/nccl;

· yunquleonliu opened on Mar 22, 2026