Why it matters

MSCCL enables custom collectives. Understanding shapes advanced use.

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The architecture

XML algorithm definitions.

Chunk sizes + steps.

Runs via NCCL API.

MSCCL stackXML algorithmcustom collectiveMSCCL runtimeexecutes stepsNCCL APIcompatibleUseful for non-standard topologies; production use narrower than NCCL
MSCCL.
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How it works end to end

Custom all-to-all, all-gather variants.

Topology-specific optimizations.

Requires XML authoring.