From: Andy Wingo <wingo@pobox.com>
To: ludo@gnu.org
Cc: 14756@debbugs.gnu.org
Subject: bug#14756: threads - par-map - multicore issue
Date: Tue, 21 Jun 2016 08:51:09 +0200 [thread overview]
Message-ID: <87lh1z592a.fsf@pobox.com> (raw)
In-Reply-To: <20130630150054.07f19f35@capac> (David Pirotte's message of "Sun, 30 Jun 2013 15:00:54 -0300")
I see this, but I'm not quite sure what's going on. What I do see is
that par-map of 1+ on a list is horribly slow, both on 2.0 and master.
Ludovic do you know what's going on here?
Andy
On Sun 30 Jun 2013 20:00, David Pirotte <david@altosw.be> writes:
> Hello,
>
> guile --version
> guile (GNU Guile) 2.0.9.20-10454
>
> It seems that the par-map not using all cores problem has some how been reintroduced?
>
> guile -c '(begin (use-modules (ice-9 threads)) (par-map 1+ (iota 400000)))'
>
> only uses 1 core [it seems it uses some other [maybe all, i can't tell] a couple of
> milliseconds, then drops to 1 core only.
>
> Thanks,
> David
>
> ;; --
>
> david@idefix:~ 16 $ guile -c '(begin
>> (use-modules (ice-9 threads))
>> (par-map 1+ (iota 400))
>> (display (current-processor-count)) (display "\n")
>> (display (length (@@ (ice-9 futures) %workers))) (display "\n"))'
> 12
> 11
next prev parent reply other threads:[~2016-06-21 6:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-30 18:00 bug#14756: threads - par-map - multicore issue David Pirotte
2016-06-21 6:51 ` Andy Wingo [this message]
2016-06-21 8:33 ` Ludovic Courtès
2017-02-28 9:53 ` Andy Wingo
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