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

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ID 772609
Date 6/30/2025
Public
Document Table of Contents
Document Table of Contents x
oneAPI Collective Communications Library (oneCCL)
oneAPI Collective Communications Library (oneCCL) x
Release Notes Introduction Install oneCCL from Source Build a 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
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
Initialization oneCCL Concepts Communication Operations
oneCCL Concepts x
Communicator Context Device Event Key-value Store Stream
Communication Operations x
Datatypes Collective Operations Operation Attributes Point-To-Point Operations
Collective Operations x
Operation Attributes Allgather Allgatherv Allreduce Alltoall Alltoallv Barrier Broadcast Group calls Reduce ReduceScatter
oneAPI Collective Communications Library (oneCCL)

Collective Operations

Level Two Title