pmodels/mpich

Issues somebody may already be working on are listed last. List everything by date

• ch4/ofi: AM header overwritten when a pipelined send is issued deferred (SIGSEGV in RMA)

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 2/5 1-3 hours Newbie friendliness 60/100

  pmodels/mpich#8074 · Opened Oct 30, 2026

  Maintainers usually reply within 1 day

• MPI_Ibcast with tsp_scatterv_{ring,recexch}_allgatherv fails with a non-contiguous datatype at 5 ranks

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 55/100

  pmodels/mpich#8070 · Opened Oct 28, 2026

  Maintainers usually reply within 1 day

• circ_graph bcast/ibcast segfaults with CIRC_GRAPH_CHUNK_SIZE=0 and a non-contiguous datatype

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 3/5 1-2 days Newbie friendliness 68/100

  pmodels/mpich#8069 · Opened Oct 28, 2026

  Maintainers usually reply within 1 day

• Steeper slow-down with GPU-aware MPI with strong scaling tests

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  pmodels/mpich#8066 · 1 comment · Opened Oct 28, 2026

  Maintainers usually reply within 1 day

• CH4 MPIX_Comm_revoke support

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#8062 · 1 comment · Opened Oct 28, 2026

  Maintainers usually reply within 1 day

• Difficulty using debuggers for process failure tests

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 35/100

  pmodels/mpich#8060 · 2 comments · Opened Oct 28, 2026

  Maintainers usually reply within 1 day

• MPICH 5.0.2 with internal PMI client doesn't use group barriers when server offers PMI-1.2

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 3/5 1-2 days Newbie friendliness 48/100

  pmodels/mpich#8056 · 1 comment · Opened Oct 27, 2026

  Maintainers usually reply within 1 day

• romio/ad_lustre: collective write cost per piece grows with the number of contiguous pieces

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#8051 · Opened Oct 25, 2026

  Maintainers usually reply within 1 day

• MPI_Gatherv and MPI_Gatherv_init fail at 512 nodes x 96 ppn

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

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

  pmodels/mpich#8036 · Opened Oct 17, 2026

  Maintainers usually reply within 1 day

• yaksa ZE backend : does not progress while a user kernel is resident on the GPU

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

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

  pmodels/mpich#8033 · 1 comment · Opened Oct 16, 2026

  Maintainers usually reply within 1 day

• jenkins: bcast_comm_world_only 10 in `ch4/ucx` - `asan`

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 1-2 days Newbie friendliness 45/100

  pmodels/mpich#8031 · Opened Oct 16, 2026

  Maintainers usually reply within 1 day

• ch3:tcp: coll/uoplong 11 occasionally hangs in osx Jenkins tests (ENOBUFS from writev treated as fatal)

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  pmodels/mpich#8029 · 2 comments · Opened Oct 16, 2026

  Maintainers usually reply within 1 day

• MPICH behavior changed when MPI_Comm_rank called *before* MPI_Init() - Aurora

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 4/5 3-5 days Newbie friendliness 18/100

  pmodels/mpich#8014 · 11 comments · Opened Oct 13, 2026

  Maintainers usually reply within 1 day

• Fatal error in internal_Allreduce

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

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

  pmodels/mpich#7983 · 4 comments · Opened Sep 24, 2026

  Maintainers usually reply within 1 day

• `mpi.h` does not define `MPI_Fint` by default — is this intended and what should packages do?

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#7973 · 2 comments · Opened Sep 16, 2026

  Maintainers usually reply within 1 day

• MPI_File_write_all / read_all collective buffering does not scale for 4D block-decomposed subarray views (Lustre): 6x slower than a user-level MPI_Alltoallv + POSIX transposition

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#7935 · 5 comments · Opened Aug 13, 2026

  Maintainers usually reply within 1 day

• Fortran 2008 strided subarrays are passed with the wrong layout

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#7932 · Opened Aug 11, 2026

  Maintainers usually reply within 1 day

• MPICH Fortran test `greqf` uses `extrastate` wrong

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#7922 · 8 comments · Opened Aug 4, 2026

  Maintainers usually reply within 1 day

• A common abstraction layer for MPI

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#7920 · 5 comments · Opened Aug 3, 2026

  Maintainers usually reply within 1 day

• Feature request: Adding a CVAR to better support oversubscription

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 35/100

  pmodels/mpich#7894 · Opened Jul 22, 2026

  Maintainers usually reply within 1 day

• MPI_Session fail when running concurently with a MPI program

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7852 · 2 comments · Opened Jun 24, 2026

  Maintainers usually reply within 1 day

• MPI_Comm_connect/accept for singleton init processes broken in MPICH v5.0.1

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  pmodels/mpich#7805 · 2 comments · Opened May 12, 2026

  Maintainers usually reply within 1 day

• Getting GPU IPC to work with HIP/ROCm

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7779 · 7 comments · Opened Apr 21, 2026

  Maintainers usually reply within 1 day

• RC tarballs and shared library versioning

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7765 · 2 comments · Opened Apr 8, 2026

  Maintainers usually reply within 1 day

• abi: MPICH does not provide the Fortran ABI library and compile wrapper

  May be free again @hzhou claimed this 212 days ago, and no pull request is open. Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  pmodels/mpich#7759 · 5 comments · 1 assignee · Opened Apr 1, 2026

  Maintainers usually reply within 1 day

• Single MPI all_reduce 50x slower than oneccl

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 5/5 Over a week Newbie friendliness 15/100

  pmodels/mpich#7752 · Opened Mar 20, 2026

  Maintainers usually reply within 1 day

• ULFM on Polaris with CUDA at 128 nodes

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7744 · Opened Mar 9, 2026

  Maintainers usually reply within 1 day

• Poor shared memory performance with small message sizes on Frontier

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7723 · 2 comments · Opened Feb 11, 2026

  Maintainers usually reply within 1 day

• MPI_Comm_spawn performance regression on Mac ARM

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  pmodels/mpich#7707 · 3 comments · Opened Jan 21, 2026

  Maintainers usually reply within 1 day

• Cannot built MPICH with flang and with shared libraries

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 15/100

  pmodels/mpich#7698 · 2 comments · Opened Dec 28, 2025

  Maintainers usually reply within 1 day

• test/mpi/rma: is win_shared_put_flush_load synchronization before checking data correct?

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#7697 · 5 comments · Opened Dec 19, 2025

  Maintainers usually reply within 1 day

• unable to find mpich.a file - mpich-4.2.0

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 3/5 1-2 days Newbie friendliness 15/100

  pmodels/mpich#7692 · 1 comment · Opened Dec 11, 2025

  Maintainers usually reply within 1 day

• [MPIX Stream] workq-based MPIX P2P Stream test failure

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 15/100

  pmodels/mpich#7670 · Opened Nov 12, 2025

  Maintainers usually reply within 1 day

• jenkins: ch3:sock + yaksa test failures

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

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

  pmodels/mpich#7635 · Opened Oct 20, 2025

  Maintainers usually reply within 1 day

• mpl/ze: fast_memcpy crash due to mmap in implicit mode

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7619 · 9 comments · Opened Oct 6, 2025

  Maintainers usually reply within 1 day

• Have valgrind suppression files installed

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 3/5 1-2 days Newbie friendliness 25/100

  pmodels/mpich#7616 · 5 comments · Opened Oct 3, 2025

  Maintainers usually reply within 1 day

• [MPIX Stream] CUDA event compatible completion semantics

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 10/100

  pmodels/mpich#7612 · 1 comment · Opened Oct 1, 2025

  Maintainers usually reply within 1 day

• osu_gather significant slowdown from 8b to 1024b

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

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

  pmodels/mpich#7604 · 5 comments · Opened Sep 30, 2025

  Maintainers usually reply within 1 day

• osu_gather/osu_scatter show large variance at 32 nodes 96 ppn

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 5/5 Over a week Newbie friendliness 15/100

  pmodels/mpich#7603 · 3 comments · Opened Sep 30, 2025

  Maintainers usually reply within 1 day

• osu_alltoall very slow at 128 nodes 96 ppn

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 5/5 Over a week Newbie friendliness 8/100

  pmodels/mpich#7601 · 13 comments · Opened Sep 29, 2025

  Maintainers usually reply within 1 day

• Current embedded libfabric version fails to build on i386 on newer GCC versions

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 15/100

  pmodels/mpich#7599 · 1 comment · Opened Sep 26, 2025

  Maintainers usually reply within 1 day

• Alltoallv hanging at 64 nodes / 96 ppn on Aurora with newer MPICH

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  aurora

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7593 · 14 comments · Opened Sep 24, 2025

  Maintainers usually reply within 1 day

• CH4 performance worse than CH3 in 2-process ping-pong benchmark

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7591 · 3 comments · Opened Sep 24, 2025

  Maintainers usually reply within 1 day

• MPI_Init_thread multi explicit allocated VCIs Hang with PyTorch

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7574 · Opened Sep 17, 2025

  Maintainers usually reply within 1 day

• Collective test failures with UCX-ROCm build

  May be free again @yfguo claimed this 409 days ago, and no pull request is open. Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  pmodels/mpich#7572 · 3 comments · 1 assignee · Opened Sep 16, 2025

  Maintainers usually reply within 1 day

• Building with NAG+gcc pulls in unsupported -pthread flag

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  pmodels/mpich#7552 · 7 comments · Opened Aug 29, 2025

  Maintainers usually reply within 1 day

• romio collective buffering should pick better aggregators by default

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel
  romio

  Difficulty 5/5 Over a week Newbie friendliness 15/100

  pmodels/mpich#7531 · Opened Aug 5, 2025

  Maintainers usually reply within 1 day

• MPIX_Stream posix_progress.h Assertion Triggered

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 4/5 3-5 days Newbie friendliness 12/100

  pmodels/mpich#7492 · 6 comments · Opened Jun 30, 2025

  Maintainers usually reply within 1 day

• hcoll: Document status of support

  Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  pmodels/mpich#7475 · Opened Jun 24, 2025

  Maintainers usually reply within 1 day

• Improve error reporting from internal libraries

  May be free again @raffenet claimed this 494 days ago, and no pull request is open. Open

  ⋯Report a problem with this issue

  • Is something wrong?

  • Already taken
  • Not beginner-friendly
  • Stale or invalid
  • Something else…
  • Send Cancel

  pmodels/mpich#7469 · 1 assignee · Opened Jun 23, 2025

  Maintainers usually reply within 1 day