Intel® oneAPI Collective Communications Library (oneCCL) Developer Guide and Reference

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ID 772609
Date 3/24/2025
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Document Table of Contents
Document Table of Contents x
Intel® oneAPI Collective Communications Library
Intel® oneAPI Collective Communications Library x
Release Notes Installation Guide Sample Application Use oneCCL package from CMake Programming Model General Configuration Advanced Configuration oneCCL API Environment Variables Notices and Disclaimers
Programming Model x
Host Communication Device Communication Limitations
General Configuration x
Execution of Communication Operations Transport Selection
Advanced Configuration x
Selection of Collective Algorithms Low-precision Datatypes Caching of Communication Operations Prioritization of Communication Operations Fusion of Communication Operations Enabling OFI/verbs/dmabuf Support
oneCCL API x
Generic workflow Error Handling Initialization oneCCL Concepts Communication Operations
oneCCL Concepts x
Communicator Context Device Event Key-value Store Stream
Communication Operations x
Datatypes Collective Operations Point-To-Point Operations
Collective Operations x
Allgather Allgatherv Allreduce Alltoall Alltoallv Barrier Broadcast Group calls Reduce ReduceScatter
Intel® oneAPI Collective Communications Library

oneCCL API

Level Two Title