TL/UCP: use pipelining in SRA allreduce for CUDA #873
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What
Use pipelining in SRA knomial allreduce algorithm for inplace CUDA buffers
Why ?
Improves performance of large messaged. In case of inplace SRA needs scratch space and for large messages we have to always allocate it through cudaMalloc which is slow.
How ?
SRA allreduce is split into chunks of CUDA memory pool element size