[Beowulf] Performance characterising a HPC application

[Ashley Pittman]

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,