# Change Log for RCCL

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