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CHANGELOG.md

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Change Log for RCCL

Full documentation for RCCL is available at https://rccl.readthedocs.io

(Unreleased) RCCL-2.12.10

Added

  • Compatibility with NCCL 2.12.10
  • Packages for test and benchmark executables on all supported OSes using CPack.
  • Adding custom signal handler - opt-in with RCCL_ENABLE_SIGNALHANDLER=1
    • Additional details provided if Binary File Descriptor library (BFD) is pre-installed

Removed

  • Removed experimental clique-based kernels

RCCL-2.11.4 for ROCm 5.1.0

Added

  • Compatibility with NCCL 2.11.4

Known issues

  • Managed memory is not currently supported for clique-based kernels

RCCL-2.10.3 for ROCm 5.0.0

Added

  • Compatibility with NCCL 2.10.3

Known issues

  • Managed memory is not currently supported for clique-based kernels

RCCL-2.9.9 for ROCm 4.5.0

Changed

  • Packaging split into a runtime package called rccl and a development package called rccl-devel. The development package depends on runtime. The runtime package suggests the development package for all supported OSes except CentOS 7 to aid in the transition. The suggests feature in packaging is introduced as a deprecated feature and will be removed in a future rocm release.

Added

  • Compatibility with NCCL 2.9.9

Known issues

  • Managed memory is not currently supported for clique-based kernels

[RCCL-2.8.4 for ROCm 4.3.0]

Added

  • Ability to select the number of channels to use for clique-based all reduce (RCCL_CLIQUE_ALLREDUCE_NCHANNELS). This can be adjusted to tune for performance when computation kernels are being executed in parallel.

Optimizations

  • Additional tuning for clique-based kernel AllReduce performance (still requires opt in with RCCL_ENABLE_CLIQUE=1)
  • Modification of default values for number of channels / byte limits for clique-based all reduce based on device architecture

Changed

  • Replaced RCCL_FORCE_ENABLE_CLIQUE to RCCL_CLIQUE_IGNORE_TOPO
  • Clique-based kernels can now be enabled on topologies where all active GPUs are XGMI-connected
  • Topologies not normally supported by clique-based kernels require RCCL_CLIQUE_IGNORE_TOPO=1

Fixed

  • Install script '-r' flag invoked alone no longer incorrectly deletes any existing builds.

Known issues

  • Managed memory is not currently supported for clique-based kernels

[RCCL-2.8.4 for ROCm 4.2.0]

Added

  • Compatibility with NCCL 2.8.4

Optimizations

  • Additional tuning for clique-based kernels
  • Enabling GPU direct RDMA read from GPU
  • Fixing potential memory leak issue when re-creating multiple communicators within same process
  • Improved topology detection

Known issues

  • None

[RCCL-2.7.8 for ROCm 4.1.0]

Added

  • Experimental support for clique-based kernels (opt in with RCCL_ENABLE_CLIQUE=1)
  • Clique-based kernels may offer better performance for smaller input sizes
  • Clique-based kernels are currently only enabled for AllReduce under a certain byte limit (controlled via RCCL_CLIQUE_ALLREDUCE_BYTE_LIMIT)

Optimizations

  • Performance improvements for Rome-based systems

Known issues

  • Clique-based kernels are currently experimental and have not been fully tested on all topologies. By default, clique-based kernels are disabled if the detected topology is not supported (override with RCCL_FORCE_ENABLE_CLIQUE)
  • Clique-based kernels may hang if there are differences between environment variables set across ranks.
  • Clique-based kernels may fail if the input / output device pointers are not the base device pointers returned by hipMalloc.

[RCCL-2.7.8 for ROCm 3.9.0]

Added

  • Adding support for alltoallv RCCL kernel

Optimizations

  • Modifications to topology based on XGMI links

Known issues

  • None

[RCCL-2.7.6 for ROCm 3.8.0]

Added

  • Support for static library builds

Known issues

  • None

[RCCL-2.7.6 for ROCm 3.7.0]

Added

  • Updated to RCCL API version of 2.7.6
  • Added gather, scatter and all-to-all collectives

[RCCL-2.7.0 for ROCm 3.6.0]

Added

  • Updated to RCCL API version of 2.6.4

[RCCL-2.7.0 for ROCm 3.5.0]

Added

  • Compatibility with NCCL 2.6
  • Network interface improvements with API v3

Optimizations

  • Fixing issues and built time improvements for hip-clang
  • Network topology detection
  • Improved CPU type detection
  • Infiniband adaptive routing support

Changed

  • Switched to hip-clang as default compiler

Deprecated

  • Deprecated hcc build