Backport #461: Re: Hard question: Any ideas why this code leaks memory?

• Status: Closed
• Assignee: matz (Yukihiro Matsumoto)

[nobu (Nobuyoshi Nakada)]

=begin
Hi,

At Wed, 20 Aug 2008 04:46:24 +0900,
Sven C. Koehler wrote in [ruby-talk:311847]:

could someone help me understand why this code leaks memory? (I am using
ruby 1.8.6 (2007-12-03 patchlevel 113) [x86_64-linux].)

def rss_leaks
/^VmRSS:\s+(\d+)/m.match(File.open("/proc/#{$$}/status") {|f|
f.read })[1].to_i
end

Calling GC.start inbetween does not help, but when we rewrote rss_leaks
this way the leaks disappeared:

def rss_no_leaks()
d = File.open("/proc/#{$$}/status") {|f| f.read }
/^VmRSS:\s+(\d+)/m.match(d)[1].to_i
end

Seems a bug.

--
Nobu Nakada
=end

[rogerdpack (Roger Pack)]

=begin
You should try SVN HEAD and see if it's still there.
See also http://rubyforge.org/tracker/?func=detail&atid=1698&aid=15425&group_id=426
=end

[shyouhei (Shyouhei Urabe)]

• Assignee set to matz (Yukihiro Matsumoto)

=begin

=end

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Assigned
• ruby -v set to -

=begin

=end

[shyouhei (Shyouhei Urabe)]

• Category set to core
• Status changed from Assigned to Feedback

=begin
Can this still happen? I can't observe on my machine with
ruby 1.8.8dev (2010-09-24 revision 27061) [x86_64-linux].

irb(main):005:0> 100000.times { rss_leaks }; rss_leaks
=> 5616
irb(main):006:0> 100000.times { rss_leaks }; rss_leaks
=> 5616
irb(main):007:0> 100000.times { rss_leaks }; rss_leaks
=> 5616
irb(main):008:0> 100000.times { rss_leaks }; rss_leaks
=> 5616

=end

[jeremyevans0 (Jeremy Evans)]

• Tracker changed from Bug to Backport
• Project changed from Ruby 1.8 to Backport187
• Description updated (diff)
• Status changed from Feedback to Closed
• ruby -v deleted (-)