Recommendation for parallelism with nested for loops?
no at spam.net
Fri Aug 19 15:15:40 UTC 2022
On Friday, 19 August 2022 at 02:02:57 UTC, Adam D Ruppe wrote:
> Even if they aren't equal, you'll get decent benefit from
> parallel on the outer one alone, but not as good since the work
> won't be balanced.
Unless there's some kind of blocking going on in D's
implementation, if the number of passes on the outer loop is
large enough relative to the number of cores, applying parallel
to the outer loop is the best you can do - uneven amounts of work
on the inner loop will get spread out across cores. There are
always counterexamples, but the ratio of passes to cores needs to
be pretty low for further optimizations to have any chance to
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