From: Daniel Berger <djberg96@...>
Date: 2005-02-05T06:30:14+09:00
Subject: Re: Too many open files - getcwd (Errno::EMFILE)

sera@fhwang.net wrote:
> So I'm working on my wonky FileSystem library, and right now it makes
a
> lot of calls to Dir.getwd. I find that if I use it enough -- right
now
> I'm integrating it into my main web site's unit tests, all 500 of
them
> -- then I get a traceback like this:
>
> /usr/local/lib/ruby/site_ruby/1.8/filesystem.rb:251:in
> `getwd'(TestArtbaseSubmissionPhaseChange): Too many open files -
getcwd
> (Errno::EMFILE)
>         from /usr/local/lib/ruby/site_ruby/1.8/filesystem.rb:251:in
> `absolute'
>         from /usr/local/lib/ruby/site_ruby/1.8/filesystem.rb:154:in
> `fill_path'
>         from ./test/ts_domain.rb:43:in `setup'
>         from /usr/bin/runtest.rb:23:in `run'
>         from /usr/bin/runtest.rb:33
>
> The ruby-talk archives lead me to believe that Errno::EMFILE is
thrown
> when you have too many open files lying around, hence the error,
> obviously. This is easy enough for me to work around, but I'm
curious:
> Why would Dir.getwd have this problem? Is it opening some files for
> some reason?

I cannot duplicate this on Solaris or Windows with 1.8.2:

irb(main):006:0> 10000.times{ Dir.getwd }
=> 10000
irb(main):007:0> 100000.times{ Dir.getwd }
=> 100000

There are no filehandles being opened in ruby_getcwd (in util.h) that I
can see, just some xmalloc/xrealloc, which is freed before you get the
result.

Very strange.

Regards,

Dan