Fusion of Communication Operations#
In some cases, it may be beneficial to postpone execution of communication operations and execute them all together as a single operation in a batch mode. This can reduce operation setup overhead and improve interconnect saturation.
oneCCL provides several knobs to enable and control such optimization:
The fusion is enabled by CCL_FUSION.
The advanced configuration is controlled by:
For now, this functionality is supported for
allreduce operations only.