Hi,
I am having problems with a script. It runs a number of iterations and plots
and saves a number of plots on each iteration. After the plots have been saved
I issue the pyplot.close('all') command so despite many plots being created
only 4 should be open at any given time which should not cause any memory
problems. When I run the script however I see the RAM usage gradually growing
without bound and eventually causing the script to crash. Interestingly I have
found if I comment out the pyplot.ion() and pyplot.ioff() the problem
vanishes. So I do have a workaround but it would still be good to have this
fixed.
My OS is Windows XP Service Pack 3
Python 2.6
Matplotlib 1.3.1
The code below is a stripped down version of my script which still exhibits the
problem. Interestingly if I set the number of iterations such that it won't run
out of memory before the script completes then one final call to
pyplot.close('all') will release all the memory. It almost looks like there is
some sort of 'race condition' between the close('all') at the end of one
iteration and the plot commands in the next iteration which create new figures.
In the taskbar Windows shows the number of windows associated with each
application => while this script runs I expect to see between 1 and 5 windows
(interpreter + 1->4 figures), however as the script progresses and the memory
usage grows Windows lists a growing number of windows associated with Python
(multiple instances of figure1/2/3/4).
OisÃn.
# -*- coding: utf-8 -*-
import sys
import time
import numpy as np
from matplotlib import pyplot
import os
# Main script body
try:
for gain in range(1,20,2):
for PortToTest in range(8):
dirname = '.\crash'
runname = '\P' + str(PortToTest) + str(gain) + \
'_' + time.strftime('d%dh%Hm%Ms%S')
dirname = dirname + runname
os.mkdir(dirname)
os.system('copy ' + sys.argv[0] + ' ' + dirname )
nIts = 50
echoPlotDec = 10
ResidN = np.random.rand(4,100)
MaxSl = np.random.rand(4,100)
MaxOld = np.random.rand(4,100)
MaxNew = np.random.rand(4,100)
EchoA = np.random.rand(100,160)
pyplot.ion()
pyplot.figure()
pyplot.plot(np.transpose(ResidN),'.-')
pyplot.savefig(dirname + '\\results.png',format='png')
pyplot.figure()
pyplot.plot(np.transpose(EchoA[0:nIts-1:echoPlotDec,:]),'.-')
pyplot.plot(np.transpose(EchoA[nIts:2*nIts-1:echoPlotDec,:]),'*-')
pyplot.savefig(dirname + '\\CoefsA.png',format='png')
pyplot.figure()
pyplot.plot(np.transpose(MaxOld),'.-')
pyplot.plot(np.transpose(MaxNew),'*-')
pyplot.savefig(dirname + '\\MaxAbsA.png',format='png')
pyplot.figure()
pyplot.plot(np.transpose(MaxSl),'.-')
pyplot.savefig(dirname + '\\MaxAbsSl.png',format='png')
pyplot.close('all')
except RuntimeError, msg:
print 'Exception occurred in main script body'
print >>sys.stderr, msg
raise
finally:
print "Test done"
# Display plots
pyplot.ioff()
------------------------------------------------------------------------------
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