pytorch/gloo

View on GitHub

Collective communications library with various primitives for multi-machine training.

Stars: 1.5k
Forks: 368
Open beginner issues: 0
Indexed issues: 69
Avg merge: 19h 32m
Merged PRs (30d): 3

Dominant language: C++
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

Open All

69 open issues indexed

SIGABRT inside gloo::transport::tcp::Address::fromPeerName(int) Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

pytorch/gloo#514 · Opened Jun 26, 2026
TCP transport: include rank information in send/recv timeout error messages Open

pytorch/gloo#511 · 1 comment · 1 assignee · Opened Jun 18, 2026
Undefined GLOO_USE_ROCM error together with HIP Open

pytorch/gloo#506 · 7 comments · 1 assignee · Opened May 26, 2026
Gloo won't compile on Alpine Linux, and how to fix it. Open

Difficulty 1/5 Under an hour Newbie friendliness 85/100

pytorch/gloo#501 · Opened Apr 11, 2026
BUG: SHM support does not compile on Arm64 Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

pytorch/gloo#486 · Opened Feb 4, 2026
[BUG] Does ibverbs transport support transferring large volumes of data？ Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pytorch/gloo#474 · 1 comment · Opened Dec 5, 2025
TCP Backend for "All Gather" experiences lower bandwidth for WORLD_SIZE=2 Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

pytorch/gloo#471 · Opened Oct 18, 2025
hi， I want to know the performance benchmark about gloo with nccl Open

Difficulty 5/5 Over a week Newbie friendliness 18/100

pytorch/gloo#464 · 2 comments · Opened Aug 29, 2025
[RFC] Async Gloo APIs Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pytorch/gloo#463 · 3 comments · 1 reaction · Opened Aug 20, 2025
Disabling Gloo logging regarding ranks Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pytorch/gloo#462 · 1 comment · 1 reaction · Opened Aug 12, 2025
[RFC] Intra-node shared memory (SHM) optimizations for communication operators on CPUs Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#455 · 6 comments · Opened Jul 11, 2025
Bfloat16 datatype not support in gloo. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#454 · Opened Jul 7, 2025
[Question] Is it safe to statically link multiple copies of gloo in a program ? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pytorch/gloo#453 · Opened Jul 2, 2025
Connection timeout in custom test using UnboundBuffer with TCP_LAZY transport Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#444 · Opened May 16, 2025
Bug Report: BarrierNewTest fails with TCP_LAZY transport after using additional context Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pytorch/gloo#443 · Opened May 16, 2025
Trying to understand why IBVerbs transport performs badly Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#436 · Opened May 6, 2025
remove Buffer in favor of UnboundBuffer Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#432 · 1 comment · Opened Apr 25, 2025
Conflicting comments and enforcement conditions in transport/tcp/buffer.cc Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

pytorch/gloo#421 · 1 reaction · Opened Mar 17, 2025
How to specify ai_family explicitly Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pytorch/gloo#399 · 1 comment · Opened Dec 4, 2024
Communication error between Win11 and Ubantu using gloo Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

pytorch/gloo#386 · 1 comment · Opened Jul 26, 2024
[Question] Gloo with Libfabric Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#385 · 1 comment · Opened Jul 1, 2024
[question] Why there is no support for communicating between Linux and Macos Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#383 · Opened Apr 30, 2024
Enable easier configuration of installation paths Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pytorch/gloo#369 · Opened Sep 29, 2023
reduce_scatter on MacOS issue Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#365 · Opened Jul 10, 2023
Support building with OpenSSL 3.x Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pytorch/gloo#358 · 2 comments · Opened May 8, 2023
PR #346 is incorrect Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pytorch/gloo#350 · Opened Jan 24, 2023
Support send/recv on the same rank Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#344 · Opened Oct 20, 2022
__caddr_t was rejected by the POSIX standard. Open

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

pytorch/gloo#341 · 1 comment · Opened Sep 28, 2022
RDMA_FORK_ SAFE Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#340 · Opened Sep 9, 2022
Problem with the performance of All_to_All communication Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pytorch/gloo#335 · 3 comments · Opened Aug 9, 2022
Message exchange failure when perform alltoallv (cpus) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#334 · Opened Jul 19, 2022
What's the biggest number of machines do we support in one group? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pytorch/gloo#327 · 1 comment · Opened Apr 20, 2022
Non-blocking collectives Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pytorch/gloo#321 · Opened Mar 17, 2022
NCCL debug with benchmark_cuda Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pytorch/gloo#317 · 1 comment · Opened Feb 9, 2022
Gloo in Pytorch for GPU tensor collective communication Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#312 · Opened Oct 14, 2021
Errors with multiple async send and receive Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pytorch/gloo#308 · Opened May 17, 2021
Compile USE_IBVERBS & work with RoCEv2 Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#304 · Opened Mar 24, 2021
output of reduce_scatter is incorrect Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pytorch/gloo#303 · 1 comment · Opened Mar 23, 2021
Does Gloo currently support multiple network NICs? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pytorch/gloo#301 · 1 comment · 1 reaction · Opened Mar 18, 2021
Cannot set NVCC FLAGS by environment variable Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pytorch/gloo#298 · 1 comment · Opened Feb 28, 2021
"No means for rendezvous" error with gloo benchmark Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pytorch/gloo#270 · 1 comment · Opened Dec 6, 2020
"address family mismatch" on init_process_group Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

pytorch/gloo#268 · 1 comment · 2 reactions · Opened Oct 1, 2020
Resolve aligned_allocator in gloo/test/allreduce_test.cc does not work on Windows platform Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

pytorch/gloo#266 · Opened Sep 10, 2020
Change unsigned long to unsigned long long in gloo/cuda_allreduce_ring_chunked.cc and gloo/allreduce_ring_chunked.h Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pytorch/gloo#265 · Opened Sep 10, 2020
macOS support? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pytorch/gloo#262 · Opened Jul 28, 2020
libuv backend not ready for use? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#257 · 1 comment · Opened May 19, 2020
Is there any plan to support running on Windows? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pytorch/gloo#255 · 1 comment · 1 reaction · Opened May 16, 2020
APT Package Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#254 · Opened May 7, 2020
Question about gloo's networking performance on 40Gbps NIC Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pytorch/gloo#248 · Opened Feb 29, 2020
I am able to reproduce #147 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pytorch/gloo#247 · 2 comments · Opened Feb 19, 2020

pytorch/gloo

Get new issues in your inbox