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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]

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