From: Eric Mahurin <eric_mahurin@...>
Date: 2005-10-16T13:21:19+09:00
Subject: Re: Help! define_method leaking procs...

--- Yohanes Santoso <ysantoso-rubytalk@dessyku.is-a-geek.org>
wrote:

> Eric Mahurin <eric_mahurin@yahoo.com> writes:
> 
> > n=2**13;(1..n).each{|i|
> >
>
a=(1..i).to_a;self.class.send(:define_method,:"f#{i}"){i*i}};GC.start;
> >
>
IO.readlines("/proc/#{Process.pid}/status").grep(/VmSize/).display'
> > VmSize:   172028 kB
> 
> > ruby -e '
> > n=2**13;(1..n).each{|i|
> >
>
a=(1..i).to_a;self.class.send(:define_method,:"f#{i}"){i*i};a=nil};GC.start;
> >
>
IO.readlines("/proc/#{Process.pid}/status").grep(/VmSize/).display'
> > VmSize:    11504 kB
> 
> Stop right there. I want to remind people that you can't use
> VmSize as
> a leak indicator. In some OS, VmSize is an always increasing
> number. Memory allocated in a process is not returned to the
> OS until
> the process dies.

OK.  Pick another way to measure memory.  top shows the same
memory as above for me.  Or make n=2**15.  This brings my
machine (768MB) to its knees:

ruby -e 'n=2**15;(1..n).each{|i|
a=(1..i).to_a;self.class.send(:define_method,:"f#{i}"){i*i}};GC.start;
IO.readlines("/proc/#{Process.pid}/status").grep(/VmSize/).display'

I'd estimate it would use about 3GB.  And if you put an a=nil
after the define_method, you get this:

ruby -e 'n=2**15;(1..n).each{|i|
a=(1..i).to_a;self.class.send(:define_method,:"f#{i}"){i*i};a=nil};GC.start;
IO.readlines("/proc/#{Process.pid}/status").grep(/VmSize/).display'
VmSize:    31032 kB



	
		
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