[gambit-list] Too many open files with process

Mikael mikael.rcv at gmail.com
Fri Sep 9 17:16:18 EDT 2011


(While making a real solution to the problem, and as a part of debugging,
run ##gc right at the end of each do-process . Does it have any effect?)

2011/9/9 Adam King <akingcoder at gmail.com>

> I need to descend a directory structure with ~5000 files in it and run an
> external process on each to gether information on each file.  However, after
> running over about 250 files, I get a "Too many open files" error.  250 is
> probably OSX default max open file limit - but I don't understand why the
> 'with-input-from-process' doesn't appear to be closing its file handle?  I
> also tried with 'open-input-process' and 'open-process' and manually calling
> 'close-input-port' but didn't help.  Here's a small script that shows the
> exact same prob:
>
> (define (test-fn)
>
>   (define (do-process)
>     (with-input-from-process (list path: "pwd") read-all))
>
>   (let loop [(count 2000)]
>     (if (> count 0)
>         (begin
>           (do-process)
>           (loop (- count 1)))
>         (println "Done"))))
>
>
> (test-fn)
>
> And the output:
>
> bigmac:iosTexConverter aking$ gsc -v
> v4.6.1 20110519175028 i386-apple-darwin10.8.0 "./configure
> /usr/local/Gambit-C/share/config.site /usr/local/Gambit-C/etc/config.site"
>
> bigmac:iosTexConverter aking$ gsi ./test.scm
> *** ERROR IN loop, "test.scm"@9.11 -- Too many open files
> (with-input-from-process '(path: "pwd") '#<procedure #2 read-all>)
> bigmac:iosTexConverter aking$
>
> Running latest from the Gambit git repo and OSX 10.6.8.  As far as I can
> tell, calling 'pwd' shouldn't be leaving around open file handles.  I also
> checked the process-status, and it was 0.  Any suggestions?
>
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