Hi John -
I just wanted to add a little to this exchange. You were talking about your
custom distribution and you said:
> My implementation isn't quite as efficient as I'd like, though I'll see
> what kind of improvement some caching will bring...
You might be interested to try the --cache-remote option when compiling
(which should work with GASNet and FIFO tasking, and maybe with qthreads).
That will activate a runtime feature that caches remote data. This feature
might be able to improve your distribution's performance without a lot of
extra work - or give you an idea how much you can reduce communication with
privatization/manual caching in the distribution implementation. If you try
it - please let me know how it goes since this feature is still pretty new.
As another note, you mentioned a desire to check the load balance when
running on a single machine (vs on a cluster). In that situation, be sure
to carefully measure something that will be the same in a cluster run. In
particular, runtime is not a good thing to measure in this situation
because you'll probably be oversubscribing the single machine and each task
will slow down (because tasks/threads will be multiplexed to fewer
processors). However, things like # of array elements processed on each
locale or the communication counts are good things to measure that should
be the same when you execute on a real cluster.
If you'd like help with gathering communication counts - just ask.
Cheers,
-michael
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