On May 7, 3:58 pm, "danmcle...@yahoo.com" <danmcle...@yahoo.com>
wrote:
> On May 7, 3:47 pm, "danmcle...@yahoo.com" <danmcle...@yahoo.com>
> wrote:
>
>
>
> > On May 7, 3:31 pm, "danmcle...@yahoo.com" <danmcle...@yahoo.com>
> > wrote:
>
> > > I am using the array module to instantiate many arrays in my
> > > application. It seems like there is a memory leak in there somewhere.
> > > Can anyone confim this and let me know what, if anything, I can do
> > > about it? I am using Fedora Core 5 Linux:
>
> > > import commands
> > > import array
> > > import itertools
> > > import sys
>
> > > from itertools import repeat
>
> > > print '*** before ***'
> > > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > > for i in range(100):
> > > a = array.array('I', repeat(0, int(2E6)))
> > > del a
> > > print '*** after ***'
> > > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > > Output:
> > > *** before ***
> > > MemFree: 1459772 kB
> > > *** after ***
> > > MemFree: 1457688 kB
>
> > I hate to reply to my own thread but I wanted to update it. I tried
> > the same code using ctypes arrays and see no memory leak:
>
> > import commands
> > import array
> > import itertools
> > import sys
> > import ctypes
>
> > from itertools import repeat
> > from ctypes import *
>
> > print '*** before ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> > for i in range(100):
> > a = ARRAY(c_uint, int(2E6))
> > del a
> > print '*** after ***'
> > print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> > *** before ***
> > MemFree: 1416364 kB
> > *** after ***
> > MemFree: 1416364 kB
>
> The above code was not correct. I actually do see a memory leak when
> using ctypes arrays also. What is going on?
>
> import commands
> import array
> import itertools
> import sys
> import ctypes
>
> from itertools import repeat
> from ctypes import *
>
> print '*** before ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
> for i in range(100):
> a = ARRAY(c_uint, int(2E6))()
> del a
> print '*** after ***'
> print commands.getoutput('cat /proc/meminfo').split('\n')[1]
>
> Output
> *** before ***
> MemFree: 1564096 kB
> *** after ***
> MemFree: 1556884 kB
Maybe the problem is with the way I was looking at free memory. I
changed my code to look at virtual memory allocated to the process in
question and I do not see any appreciable before/after difference.
import commands
import array
import itertools
import sys
import os
from itertools import repeat
deltas = []
print '*** before ***'
s = commands.getoutput('cat /proc/%d/status' % os.getpid()).split('\n')
[12]
print s
for i in range(100):
a = array.array('I', repeat(0, int(2E6)))
del a
print '*** after ***'
s = commands.getoutput('cat /proc/%d/status' % os.getpid()).split('\n')
[12]
print s
Output:
*** before ***
VmSize: 5952 kB
*** after ***
VmSize: 5956 kB
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