Collective Operations

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.

• Allgather
• Allgatherv
• Allreduce
• Alltoall
• Alltoallv
• Barrier
• Broadcast
• Group calls
• Reduce
• ReduceScatter

Operation Attributes

template<class coll_attribute_type, class... attr_val_type> coll_attribute_type CCL_API create_operation_attr (attr_val_type &&... avs)

Creates an attribute object that may be used to customize communication operation.

Returns:

an attribute object