GNU bug report logs - #12789
threads - proc-map - multicore issue

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: David Pirotte <david <at> altosw.be>
To: bug-guile <at> gnu.org
Subject: threads - proc-map - multicore issue
Date: Fri, 2 Nov 2012 22:07:27 -0200

Hello,

in the following example, the cores, 4 in my case, are used for a couple of seconds,
then at some point only one core is used:

guile -c '(begin (use-modules (ice-9 threads)) (par-map 1+ (iota 400000)))'

Cheers,
David

Message #10 received at 12789-done <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: David Pirotte <david <at> altosw.be>
Cc: 12789-done <at> debbugs.gnu.org
Subject: Re: bug#12789: threads - proc-map - multicore issue
Date: Sat, 03 Nov 2012 22:06:50 +0100

Hi David,

David Pirotte <david <at> altosw.be> skribis:

> in the following example, the cores, 4 in my case, are used for a couple of seconds,
> then at some point only one core is used:
>
> guile -c '(begin (use-modules (ice-9 threads)) (par-map 1+ (iota 400000)))'

I fixed it just after we discussed it on IRC, in commit 134c95f of
stable-2.0.

Thanks again for the report!

Ludo’.

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