kuba roth <kuba.r...@gmail.com> writes:
> I've got more examples for OSX which clearly shows that as soon as the
> number of tasks exceeds number of cores pmap performance suffers. It
> seems to me like there is no blocking taking place on threads and all
> the tasks are started at the same time.
There’s a still-open bug with `pmap` and chunked seqs which sounds like
it may what you’re seeing:
http://dev.clojure.org/jira/browse/CLJ-862
You can get `pmap` to work mostly-reasonably by unchunking input seqs
first, although I’ve found it doesn’t work well for many problems anyway
(no control over level of parallelism, FIFO ordering, etc).
-Marshall
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