NCCL Release 2.10.3

This is the NCCL 2.10.3 release notes. For previous NCCL release notes, refer to the NCCL Archives.


NCCL 2.10.3 has been tested with the following:

Key Features and Enhancements

This NCCL release includes the following key features and enhancements.

  • Added ncclAvg operation

  • Added support for bfloat16 type

  • Added support for multiple IB queue pairs

  • Added WSL2 support (single GPU only)

  • Improved performance for aggregation

  • Improved performance for medium sizes

  • Improved network error reporting

  • Added NCCL_NET environment variable to use a specific network

  • Added auto-load of XML topology from default location

Fixed Issues

The following issues have been resolved in NCCL 2.10.3:
  • Fixed graph search on cubemesh topologies.

  • Fixed all-to-all affinity to improve latency.

  • Fixed hang in cubemesh NVB connections during initialization.