Commits on Mar 12, 2020

1. Avoid more comm/compute overlap in ugni …

   In 12960 we eliminated comm/compute overlap for FMA operations when a
   task hadn't done ~100 FMA operations. Here we extend that to RDMA and
   chained FMA operations as well. This is motivated by aggregation work
   where we do on-stmts followed by large RDMA PUTs/GETs, but we really
   don't want too many tasks started at once since that increses memory
   presssure. This also adds an option to completely disable comm/compute
   overlap in ugni, but it's not enabled by default since it has a 2x
   performance hit for SSCA.

   

   ronawho committed Mar 12, 2020
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