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Changelog for RCCL

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

RCCL 2.21.5 for ROCm 6.3.1

Added

Changed

  • Enhanced user documentation

Resolved issues

  • Corrected user help strings in install.sh

RCCL 2.21.5 for ROCm 6.3.0

Added

  • MSCCL++ integration for AllReduce and AllGather on gfx942
  • Performance collection to rccl_replayer
  • Tuner Plugin example for MI300
  • Tuning table for large number of nodes
  • Support for amdclang++
  • Allow NIC ID remapping using NCCL_RINGS_REMAP environment variable

Changed

  • Compatibility with NCCL 2.21.5
  • Increased channel count for MI300X multi-node
  • Enabled MSCCL for single-process multi-threaded contexts
  • Enabled gfx12
  • Enabled CPX mode for MI300X
  • Enabled tracing with rocprof
  • Improved version reporting
  • Enabled GDRDMA for Linux kernel 6.4.0+

Resolved issues

  • Fixed model matching with PXN enable

RCCL 2.20.5 for ROCm 6.2.1

Fixed

  • GDR support flag now set with DMABUF

Known issues

  • On systems running Linux kernel 6.8.0, such as Ubuntu 24.04, Direct Memory Access (DMA) transfers between the GPU and NIC are disabled and impacts multi-node RCCL performance.
    • This issue was reproduced with RCCL 2.20.5 (ROCm 6.2.0 and 6.2.1) on systems with Broadcom Thor-2 NICs and affects other systems with RoCE networks using Linux 6.8.0 or newer.
    • Older RCCL versions are also impacted.
    • This issue will be addressed in a future ROCm release.

RCCL 2.20.5 for ROCm 6.2.0

Changed

  • Compatibility with NCCL 2.20.5
  • Compatibility with NCCL 2.19.4
  • Performance tuning for some collective operations on MI300
  • Enabled NVTX code in RCCL
  • Replaced rccl_bfloat16 with hip_bfloat16
  • NPKit updates:
    • Removed warm-up iteration removal by default, need to opt in now
    • Doubled the size of buffers to accommodate for more channels
  • Modified rings to be rail-optimized topology friendly
  • Replaced ROCmSoftwarePlatform links with ROCm links

Added

  • Support for fp8 and rccl_bfloat8
  • Support for using HIP contiguous memory
  • Implemented ROC-TX for host-side profiling
  • Enabled static build
  • Added new rome model
  • Added fp16 and fp8 cases to unit tests
  • New unit test for main kernel stack size
  • New -n option for topo_expl to override # of nodes
  • Improved debug messages of memory allocations

Fixed

  • Bug when configuring RCCL for only LL128 protocol
  • Scratch memory allocation after API change for MSCCL

RCCL 2.18.6 for ROCm 6.1.0

Changed

  • Compatibility with NCCL 2.18.6

RCCL 2.18.3 for ROCm 6.0.0

Changed

  • Compatibility with NCCL 2.18.3

RCCL 2.17.1-1 for ROCm 5.7.0

Changed

  • Compatibility with NCCL 2.17.1-1
  • Performance tuning for some collective operations

Added

  • Minor improvements to MSCCL codepath
  • NCCL_NCHANNELS_PER_PEER support
  • Improved compilation performance
  • Support for gfx94x

Fixed

  • Potential race-condition during ncclSocketClose()

RCCL 2.16.2 for ROCm 5.6.0

Changed

  • Compatibility with NCCL 2.16.2

Fixed

  • Remove workaround and use indirect function call

RCCL 2.15.5 for ROCm 5.5.0

Changed

  • Compatibility with NCCL 2.15.5
  • Unit test executable renamed to rccl-UnitTests

Added

  • HW-topology aware binary tree implementation
  • Experimental support for MSCCL
  • New unit tests for hipGraph support
  • NPKit integration

Fixed

  • rocm-smi ID conversion
  • Support for HIP_VISIBLE_DEVICES for unit tests
  • Support for p2p transfers to non (HIP) visible devices

Removed

RCCL-2.13.4 for ROCm 5.4.0

Changed

  • Compatibility with NCCL 2.13.4
  • Improvements to RCCL when running with hipGraphs
  • RCCL_ENABLE_HIPGRAPH environment variable is no longer necessary to enable hipGraph support
  • Minor latency improvements

Fixed

  • Resolved potential memory access error due to asynchronous memset

RCCL-2.12.10 for ROCm 5.3.0

Changed

  • Improvements to LL128 algorithms

Added

RCCL-2.12.10 for ROCm 5.2.3

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
  • Adding support for reusing ports in NET/IB channels
    • Opt-in with NCCL_IB_SOCK_CLIENT_PORT_REUSE=1 and NCCL_IB_SOCK_SERVER_PORT_REUSE=1
    • When "Call to bind failed : Address already in use" error happens in large-scale AlltoAll (e.g., >=64 MI200 nodes), users are suggested to opt-in either one or both of the options to resolve the massive port usage issue
    • Avoid using NCCL_IB_SOCK_SERVER_PORT_REUSE when NCCL_NCHANNELS_PER_NET_PEER is tuned >1

Removed

  • Removed experimental clique-based kernels

RCCL-2.11.4 for ROCm 5.2.0

Changed

  • Unit testing framework rework
  • Minor bug fixes

Known issues

  • Managed memory is not currently supported for 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