Re: [Matplotlib-users] Memory leak in Agg backend?

[Jesper L. <jes...@gm...>]

I forgot to mention that it seems like the issue is related to the
Figure object (and not any foreign language extensions?). When a
fig.clf() is added before the call to report_memory the memory usage
is constant. Since I am reusing the Figure instance this is a problem
for me. But maybe I just need to figure out what to delete from the
Figure instance - or should it be unchanged for the case I presented?

Best regards,
Jesper

2009/4/15 Michael Droettboom <md...@st...>:
> I am not able to reproduce this leak here with 0.98.6svn from today on
> RHEL4.  What platform are you on?
>
> (See attached massif profile -- the memory usage is flat...)
>
> Mike
>
> Jesper Larsen wrote:
>>
>> Hi matplotlib developers and users,
>>
>> I have had some problems with a memory leak in a long running
>> matplotlib based web application that I have developed
>> (www.worldwildweather.com). I believe the problem is due to a memory
>> leak in the Agg backend but I am not sure. Below is a script which for
>> me results in a consistently increasing amount of  memory usage. I am
>> using mpl version 0.98.6svn. The problem does not occur when the
>> savefig command is commented out. And it does not occur when "cs =
>> ax.contourf(z)" and "ax.cla()" are moved outside the loop (before and
>> after respectively).
>>
>> Best regards,
>> Jesper
>>
>> import os, gc
>> import numpy as npy
>> import matplotlib as mpl
>> from matplotlib.figure import Figure
>> from matplotlib.backends.backend_agg import FigureCanvasAgg as
>> FigureCanvas
>>
>> def report_memory():
>>    """Report memory."""
>>    gc.collect()
>>    pid = os.getpid()
>>    a2 = os.popen('ps -p %d -o rss,vsz,%%mem' % pid).readlines()
>>    return int(a2[1].split()[1])
>>
>> fig = Figure(dpi=100)
>> ax = fig.add_axes([0.1, 0.1, 0.8, 0.8])
>> FigureCanvas(fig)
>>
>> n = 1000
>> z = npy.zeros((n,n))
>> for i in range(2000):
>>    cs = ax.contourf(z)
>>    fig.savefig('test.png')
>>    ax.cla()
>>    print report_memory(), i
>>
>> I have not pasted in all of the output but just the first and last 25
>> lines:
>> 53356 0
>> 53360 1
>> 53360 2
>> 53360 3
>> 53360 4
>> 53360 5
>> 53360 6
>> 53360 7
>> 53360 8
>> 53360 9
>> 53360 10
>> 53360 11
>> 53360 12
>> 53360 13
>> 53360 14
>> 53360 15
>> 53360 16
>> 53360 17
>> 53356 18
>> 53360 19
>> 53360 20
>> 53360 21
>> 53360 22
>> 53360 23
>> 53356 24
>> ...
>> 57552 1975
>> 57552 1976
>> 57552 1977
>> 57552 1978
>> 57552 1979
>> 57552 1980
>> 57552 1981
>> 57552 1982
>> 57552 1983
>> 57552 1984
>> 57552 1985
>> 57552 1986
>> 57552 1987
>> 57552 1988
>> 57552 1989
>> 57552 1990
>> 57552 1991
>> 57552 1992
>> 57552 1993
>> 57552 1994
>> 57552 1995
>> 57552 1996
>> 57552 1997
>> 57552 1998
>> 57552 1999
>>
>>
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>
> --
> Michael Droettboom
> Science Software Branch
> Operations and Engineering Division
> Space Telescope Science Institute
> Operated by AURA for NASA
>
>