Programming Model#
Note
This document describes the legacy C++ API. Documentation for the new C API that closely follows the NVIDIA Collective Communications Library (NCCL)* API standard can be found here.
The existing C++ API will remain the default API for the 2021.17 release.
The programming model for oneCCL describes how to:
Set up distributed computations.
Perform collective communication operations (for example, ALLREDUCE, BROADCAST, ALLGATHER).
See also
See oneCCL specification that oneCCL is based on.
oneCCL supports a single rank/process per GPU device. The current implementation does not yet support a single process opening multiple devices.
Review the oneCCL generic workflow in the specification before getting started with the communication operations.
You can quickly get started with: