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bug#14756: threads - par-map - multicore issue
From: |
Andy Wingo |
Subject: |
bug#14756: threads - par-map - multicore issue |
Date: |
Tue, 21 Jun 2016 08:51:09 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
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 <address@hidden> 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
>
> ;; --
>
> address@hidden:~ 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
- bug#14756: threads - par-map - multicore issue,
Andy Wingo <=