[Beowulf] Performance characterising a HPC application

Ashley Pittman ashley at quadrics.com
Wed Apr 4 09:13:13 EDT 2007


Patrick Geoffray wrote:
> I would bet that UPC could more efficiently leverage a strided or vector
> communication primitive instead of message aggregation. I don't know if
> GasNet provides one, I know ARMCI does.

GasNet does however get extra credit for having a asynchronous
collective, namely barrier.  Unfortunately when you read the spec it's
actually a special case asynchronous reduce which is almost impossible
to optimise anything like as well as barrier which is a shame.

Ashley,
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