Issues

• Classic UCX SMP: exit hangs after "End of program" when sends are still in flight (decided: leave unfixed)

  BugclassicUCXwontfix
  charmplusplus/charm#4008 · Filter by author lvkale opened on Sep 24, 2026

• Message forwarding to migrated elements has no hop cap; the send-back-home limit has never been enabled

  charmplusplus/charm#3997 · Filter by author lvkale opened on Sep 19, 2026

• Revisit the 64-bit object id design: bit allocation, index-to-id mapping, and when an array is compressible

  charmplusplus/charm#3994 · Filter by author lvkale opened on Sep 18, 2026
  5

• CI: ucx-linux-x86_64_openpmix fails intermittently in ConverseInit with "ucp_ep_create failed: Invalid parameter" (3 times in 3 days)

  charmplusplus/charm#3993 · Filter by author lvkale opened on Sep 18, 2026

• Zerocopy post API: posting a buffer smaller than the source is allowed but unreported; larger is unchecked on the host path. Decide the contract.

  charmplusplus/charm#3989 · Filter by author lvkale opened on Sep 17, 2026
  1

• tests/util and tests/ampi do not build on reconverse; make -C tests test cannot pass on this line

  charmplusplus/charm#3988 · Filter by author lvkale opened on Sep 17, 2026

• macOS CI: intermittent startup hang in lcrun -n 2 ./megatest +pe 4 (reconverse-darwin-arm64, 2-process step)

  charmplusplus/charm#3987 · Filter by author lvkale opened on Sep 17, 2026
  1

• CUDA build: host zerocopy acks routed to the device handler (setNcpyOpInfo declared with 24 parameters, defined with 25)

  charmplusplus/charm#3983 · Filter by author lvkale opened on Sep 16, 2026
  2

  

• Device zerocopy post API: the regular entry method receives the sender's device pointer, not the posted buffer (RDMA path)

  charmplusplus/charm#3981 · Filter by author lvkale opened on Sep 16, 2026

• zerocopy_with_qd: intermittent early quiescence in the two-process run on reconverse (macOS CI, 1 of ~10)

  charmplusplus/charm#3978 · Filter by author lvkale opened on Sep 14, 2026

• GPU load balancing: improve accuracy of device loads for a mix of kernels; idle-time-based incremental balancing

  charmplusplus/charm#3976 · Filter by author lvkale opened on Sep 13, 2026

• hapi_memory_daemon: EOF path spins at 1 kHz for the life of the run; EINTR path spins unthrottled

  charmplusplus/charm#3973 · Filter by author lvkale opened on Sep 10, 2026

• GPU helper threads inherit a PE's single-core affinity mask under +pemap, costing 22-63% of GPU iteration time

  charmplusplus/charm#3972 · Filter by author lvkale opened on Sep 10, 2026

• src/arch/common/*.sh file directly references compiler, always getting system version-

  charmplusplus/charm#3971 · Filter by author erichkeane opened on Sep 9, 2026
  2

• Persistent device messaging (CkDevicePersistent) aborts for inter-node transfers

  charmplusplus/charm#3970 · Filter by author lvkale opened on Sep 9, 2026
  1

• Device zerocopy: user documentation and diagnostics owed

  charmplusplus/charm#3967 · Filter by author lvkale opened on Sep 3, 2026
  

• Device zerocopy source callbacks: no way to tell which buffer completed, and no per-send completion

  charmplusplus/charm#3966 · Filter by author lvkale opened on Sep 3, 2026
  1

• Host zerocopy path: bundle deregistration acks instead of one NcpyOperationInfo message per buffer

  charmplusplus/charm#3964 · Filter by author lvkale opened on Sep 2, 2026

• Device zerocopy examples repack send buffers with nothing guaranteeing the neighbour's get has finished reading them

  charmplusplus/charm#3963 · Filter by author lvkale opened on Sep 2, 2026
  

• Device zerocopy (nocopydevice / CkDeviceBuffer) registers the GPU buffer per message on both ends and never deregisters; long GPU-direct runs die with ENOSPC

  charmplusplus/charm#3960 · Filter by author lvkale opened on Sep 1, 2026
  4

• GPU D2D: sender blocks on hapiStreamSynchronize in the intra-process path

  charmplusplus/charm#3957 · Filter by author lvkale opened on Aug 31, 2026

• One tree for both runtimes: classic arches to be served by main + reconverse glue, not by resurrecting classic in the branch

  charmplusplus/charm#3941 · Filter by author lvkale opened on Aug 25, 2026
  2

• ARM64 with Infiniband is not supported

  charmplusplus/charm#3935 · Filter by author HanatoK opened on Jul 31, 2026

• trace-summary: .sum idle/utilization and .sumd per-EP times disagree in +sumDetail traces

  charmplusplus/charm#3934 · Filter by author lvkale opened on Jul 29, 2026

• Projections: .sts provenance is incomplete (PROJECTIONS_ID empty; COMMANDLINE misses pre-snapshot args; no app version / job id / environment)

  charmplusplus/charm#3933 · Filter by author lvkale opened on Jul 27, 2026