Release Notes :: NVIDIA Deep Learning NCCL Documentation

Release Notes (PDF) - Last updated June 7, 2022 -

NCCL Release 2.9.6

This is the NCCL 2.9.6 release notes. For previous NCCL release notes, refer to the NCCL Archives.

Compatibility

NCCL 2.9.6 has been tested with the following:

Deep learning framework containers. Refer to the Support Matrix for the supported container version.
This NCCL release supports CUDA 10.1, CUDA 10.2, CUDA 11.0, and CUDA 11.3.

Key Features and Enhancements

This NCCL release includes the following key features and enhancements.

Added support for CUDA graphs
Improved performance for CollNet (SHARP)
Fuse PCI Gen4 switches showing a two-level hierarchy into a single level.
Improve NIC balancing for communicators using a single GPU per node.

Fixed Issues

The following issues have been resolved in NCCL 2.9.6:

Fixed bootstrap hang in case of reordered packets causing connections to be inverted.
Fix locking issue causing NCCL calls to block until previous operations were complete.