On 4/23/07, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
>
> I'm producing series of plots (spectograms) in a program loop using imshow
> and saving each plot to .png. Even though I close() each plot after each
> savefig(...), the memory does not appear to be freed up, and the memory
> useage goes up and up as the program runs (and stalls the computer as it
> thrashes the page file).
>
> This is the essence of the code:
>
> for i in range(..):
> pylab.imshow(logPSDs[i]...)
> pylab.colorbar()
> pylab.savefig(plotName[i])
> pylab.close()
The following code does not appear to leak:
import matplotlib
matplotlib.use('Agg')
from matplotlib.cbook import report_memory
import matplotlib.numerix as nx
import pylab
for i in range(100):
print i, report_memory(i)
fig = pylab.figure(1)
X = nx.mlab.rand(100,100)
pylab.imshow(X)
pylab.colorbar()
pylab.savefig('_test%d'%i)
pylab.close(1)
Are you running your program in a GUI? Eric points out there are some
leaks in the GUI canvases which we have not succeeded in tracking
down. If you only want image generation, you can use an image backend
w/o leaks. The one thing to be careful of is to make sure you are not
overplotting multiple images onto the same Axes, eg by clearing the
figure or axes if you are reusing it.
JDH
>
> Is there anything that I should be doing to stop this memory "wastage"?
> (The plots themselves are fantastic!)
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