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Re: Extremely high overhead of 'par-map'


From: Mark H Weaver
Subject: Re: Extremely high overhead of 'par-map'
Date: Fri, 29 Mar 2013 19:18:04 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Hi Noah,

Noah Lavine <address@hidden> writes:
> Oh, sorry to email twice so soon, but I have an idea for making
> par-map usable in more cases: add a keyword argument called
> "block-size". Its value should be a positive integer, and the meaning
> is to have each thread do block-size iterations.

IMO, we should avoid adding anything like this.  It would be hard for
callers to know what value to pass.  I think it should be possible to
make 'par-map' act sensibly and efficiently without this kind of help.

> I tried to benchmark it, but got a segmentation fault. I think we
> have plenty of work to do here. :-)

Ouch.  Can you please file a bug report with the full details?

    Regards,
      Mark



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