This document is relevant for: Inf2, Trn1, Trn2
Neuron Collectives Release Notes#
Neuron Collectives refers to a set of libraries used to support collective compute operations within the Neuron SDK. The collectives support is delivered via the aws-neuronx-collectives package and includes a pre-built version of the OFI plugin required for use of collectives with Elastic Fabric Adapter (EFA).
Neuron Collectives [2.26.43.0]#
Date: 06/24/2025
Bug fixes#
Fixed various memory leaks which occur during process cleanup
Neuron Collectives [2.25.65.0]#
Date: 05/19/2025
New in this release#
Added multinode collectives support for Trainium2 instances without EFA devices
Improvements#
Minor performance improvement to network proxy handshake
Bug fixes#
Fixed memory leak clearning up communication devices during
nrt_close
Neuron Collectives [2.24.59.0]#
Date: 04/03/2025
Improvements#
Improved interface between
libnccomandlibnrtresulting stability improvements
Neuron Collectives [2.23.135.0]#
Date: 01/14/2025
Improvements#
Aws-ofi-nccl: minor performance improvement
Neuron Collectives [2.23.133.0]#
Date: 12/20/2024
New in this release#
Added Trainium2 support
Improvements#
Improved startup times for large scale training jobs by up to 5 seconds
Enhanced error logging for bootstrap failures
Neuron Collectives [2.22.26.0]#
Date: 09/16/2024
New in this release:#
Added check to print out an error message on invalid
NEURON_RT_ROOT_COMM_IDconfigurations
Bug fixes#
Resolved an issue where the
libnccom.sofilename was versioned incorrectly aslibnccom.so.2.y.y. Will be correctly versioned aslibnccom.so.2.22.26in this release.
Neuron Collectives [2.21.46.0]#
Date: 07/03/2024
New in this release:#
Bootstrap changes to improve application startup latency for large-scale workloads
Logging improvements
Neuron Collectives [2.20.22.0]#
Date: 04/01/2024
New in this release:#
minor bug fixes and enhancements
Neuron Collectives [2.20.11.0]#
Date: 02/13/2024
Bug Fixes#
Require “libatomic” for rpm installs
Neuron Collectives [2.19.7.0]#
Date: 12/21/2023
New in this release#
Improve collectives barrier latency from 500us to 40us
Bug Fixes#
Fix bug where proxy thread blocks the runtime from adding ops leading to an execution hang
Neuron Collectives [2.18.18.0]#
Date: 10/26/2023
New in this release: * Bumpped compatibility version to 17 to align with struct change in the nec.h header
Neuron Collectives [2.17.9.0]#
Date: 9/14/2023
New in this release: * minor bug fixes and enhancements
Neuron Collectives [2.16.16.0]#
Date: 9/01/2023
New in this release: * minor bug fixes and enhancements
Neuron Collectives [2.16.8.0]#
Date: 8/28/2023
New in this release:
Improved error messages for unsupported topologies
Improved timeout error messages for bootstrapInit
Bug Fixes: * Fix bug where Linux kernel version check for SAFE_FORK env variable was incorrectly requiring SAFE_FORK to be set on kernel versions greater than 5
Neuron Collectives [2.15.16.0]#
Date: 8/09/2023
New in this release:
minor bug fixes and enhancements
Neuron Collectives [2.15.13.0]#
Date: 7/19/2023
New in this release:
AllReduce with All-to-all communication pattern enabled for 16 ranks on TRN1/TRN1N within the instance (intranode); choice of 16 ranks is limited to NeuronCores 0-15 or 16-31.
Bug Fixes:
Fix incorrect mask calculation for 16 ranks when using NeuronCores 16-31
Fix channels for 16 ranks to avoid failures in the runtime; restrict participating ranks to 0-15 or 16-31
Neuron Collectives [2.14.9.0]#
Date: 6/14/2023
New in this release
Added check for FI_EFA_FORK_SAFE environment variable; now forcing the flag to be set to 1 for multinode runs executing on Linux kernels older than 5.15.
Neuron Collectives [2.13.7.0]#
Date: 05/01/2023
New in this release
Added support for dma_buf - required for future EFA and Linux kernel updates.
Reduced benign reporting of timeouts. Previous implementations reported “Timeout waiting for incoming connection” too frequently (log spam).
Neuron Collectives [2.12.35.0]#
Date: 04/19/2023
Bug Fixes
Fixed support for SOCKET_IFNAME config that was affecting EKS users at scale on large training jobs.
Neuron Collectives [2.12.22.0]#
Date: 03/28/2023
New in this release
Added support for TRN1N.
Added support for 16 channels and 16 EFA devices, which is required for enabling EC2 TRN1N instances with Neuron.
Added support for hierarchical All-Reduce and Reduce-Scatter. These implementations are now used by default and provides up to 75% reduction in latency for 2MB buffers across 256 ranks.
Neuron Collectives [2.11.47.0]#
Date: 02/08/2023
New in this release
Added support for Inf2.
Neuron Collectives [2.10.20.0]#
Date: 10/10/2022
New in this release
Improved logging to appear similar in style to Neuron Runtime
Bug Fixes
Fixed memory registration to support 2GB+ sizes
Fixed association of network devices to channels (removes previous hard-coding).
Neuron Collectives [2.9.86.0]#
Date: 10/10/2022
New in this release
Added support for All-Reduce, Reduce-Scatter, All-Gather, and Send/Recv operations.
This document is relevant for: Inf2, Trn1, Trn2