GNU bug report logs - #14756
threads - par-map - multicore issue

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From: David Pirotte <david <at> altosw.be>
To: 14756 <at> debbugs.gnu.org
Subject: bug#14756: threads - par-map - multicore issue
Date: Sun, 30 Jun 2013 15:00:54 -0300

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 <at> 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
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