You can try running the garbage collector after each savefig. ("import
gc" and then call "gc.collect()"). If you are using a GUI backend, you
may want to try using the "raw" Agg backend instead -- there are fewer
moving parts that way.
There have been a number of memory leaks that have been fixed since
0.90.1. You may want to try 0.91 or a SVN checkout to see if that fixes
your problem.
There is additional information about memory leaks in the FAQ. I don't
know if any are relevant to your particular situation:
http://matplotlib.sourceforge.net/faq.html#LEAKS
If none of the above helps, please send a complete but short script that
reproduces the error (basing it on memleak_gui.py or memleak_hawaii.py
is even more helpful), and one of the developers can look into it.
Cheers,
Mike
Jordan Atlas wrote:
> Hi all,
>
> I've noticed that when I save my figures using savefig the memory is
> not immediately released. For example, in pseudocode,
>
> times = get_times()
> for var_id in var_list:
> Plotting.figure()
> var_values = get_values(var_id)
> pylab.plot(times, values)
> Plotting.savefig(var+'.png', dpi=150)
> Plotting.close()
>
> This pseudo code loops over a list of variables, gets their values, and
> saves a plot for each one. The variable list has hundreds of items. If
> I run the code like this, the memory usage grows very quickly until
> python crashes. If I comment out the savefig line, or shorten the list
> of variables, the code completes without error.
>
> Can anyone suggest how I might write this differently so that I can
> process the long list of variables and save the figures? Is there any
> way to force the program to release memory once the figures are saved?
>
> I'm using matplotlib 0.90.1 and python 2.4 on windows XP.
>
> Thank you,
>
> --Jordan Atlas
>
>
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Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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