[debbugs-tracker] bug#26616: closed (guile-2.2 par-for-each hangs for large lists)

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Your message dated Sat, 22 Apr 2017 22:29:51 -0500
with message-id <address@hidden>
and subject line close
has caused the debbugs.gnu.org bug report #26616,
regarding guile-2.2 par-for-each hangs for large lists
to be marked as done.

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26616: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=26616
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--- Begin Message --- Subject: guile-2.2 par-for-each hangs for large lists Date: Sat, 22 Apr 2017 19:32:39 -0500

The following spins, burning about 250% cpu time, for large lists; it works fine for smaller lists.   This is for a recent version of guile from git: 

guile -v
guile (GNU Guile) 2.1.5.19-7e9395

will retry with newer guile shortly.

On fresh guile:

(use-modules (srfi srfi-1))
(define al (list-tabulate 100000 values))
(define foo 0)
(par-for-each (lambda (x) (set! foo (+ x foo))) al)

^CERROR: In procedure scm-error:
ERROR: User interrupt

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(guile-user) [1]> ,bt
In ice-9/threads.scm:
   289:22  5 (loop _)
In ice-9/futures.scm:
   265:11  4 (touch #<future 55e1984d3400 started #<procedure 55e198659f60 a…>)
   243:14  3 (work)
In unknown file:
           2 (wait-condition-variable #t)
While executing meta-command:
ERROR: In procedure cdr: Wrong type argument in position 1 (expecting pair): ()
scheme@(guile-user) [1]>

The above is after interrupting after an hour or so of accumulated CPU time.

Again, shorter lists (e.g. 10K long) work fine. My production lists are about 400K to 2M in size.

--linas

--- End Message ---

--- Begin Message --- Subject: close Date: Sat, 22 Apr 2017 22:29:51 -0500

Per last message, close.

--- End Message ---