Re: [Matplotlib-users] Memory leak when using pyplot.ion() ?

[Michael D. <md...@st...>]

I haven't had a chance to look into where the memory is actually 
leaking, ion/ioff are intended for interactive use, and here you are 
saving a large number of plots to files.  Why do you need ion at all?

Mike

On 10/14/2013 08:51 AM, OCuanachain, Oisin (Oisin) wrote:
>
> 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 in 
> case I forget about it in future and loose another weekend's work.
>
> My OS is Windows XP Service Pack 3
>
> Python 2.6
>
> Matplotlib 1.0.1
>
> The code below is a stripped down version of my script which still 
> exhibits the problem.
>
> Oisín.
>
> # -*- 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'
>
>         f = open(dirname + '\\results.m','w')
>
>         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
>
>         # Decimate  data for plotting if many iterations are run
>
>         if(nIts>10):
>
>           echoPlotDec = 10
>
>         else:
>
>           echoPlotDec = 1
>
>         ResidN   = np.zeros((4,2*nIts))
>
>         MaxSl    = np.zeros((4,2*nIts))
>
>         MaxOld   = np.zeros((4,2*nIts))
>
>         MaxNew   = np.zeros((4,2*nIts))
>
>         EchoA    = np.zeros((2*nIts,160))
>
>         for kk in range(2*nIts):
>
>             ResidN[0,kk] = np.random.rand(1,1)
>
>             ResidN[1,kk] = np.random.rand(1,1)
>
>             ResidN[2,kk] = np.random.rand(1,1)
>
>             ResidN[3,kk] = np.random.rand(1,1)
>
>             MaxSl[0,kk] = np.random.rand(1,1)
>
>             MaxSl[1,kk] = np.random.rand(1,1)
>
>             MaxSl[2,kk] = np.random.rand(1,1)
>
>             MaxSl[3,kk] = np.random.rand(1,1)
>
>             MaxOld[0,kk] = np.random.rand(1,1)
>
>             MaxOld[1,kk] = np.random.rand(1,1)
>
>             MaxOld[2,kk] = np.random.rand(1,1)
>
>             MaxOld[3,kk] = np.random.rand(1,1)
>
>             MaxNew[0,kk] = np.random.rand(1,1)
>
>             MaxNew[1,kk] = np.random.rand(1,1)
>
>             MaxNew[2,kk] = np.random.rand(1,1)
>
>             MaxNew[3,kk] = np.random.rand(1,1)
>
>             EchoA[kk,:] = np.random.rand(1,160)
>
>         f.close()
>
>         pyplot.ion()
>
>         pyplot.figure()
>
>         pyplot.hold(True)
>
>         LegendTexts = ("A","B","C","D")
>
>         pyplot.title("R (" + runname +")")
>
> pyplot.xlabel("Index")
>
> pyplot.ylabel("Noise (dB)")
>
>         pyplot.grid(True)
>
>         pyplot.hold(True)
>
> pyplot.plot(np.transpose(ResidN),'.-')
>
> pyplot.legend(LegendTexts,loc=1)
>
>         pyplot.axis([0, 2*nIts, -33, -25])
>
> pyplot.savefig(dirname + '\\results.emf',format='emf')
>
>         pyplot.figure()
>
>         pyplot.hold(True)
>
>         pyplot.title("Coefs")
>
> pyplot.xlabel("Coef Index")
>
> pyplot.ylabel("Coef Value")
>
>         pyplot.grid(True)
>
>         pyplot.hold(True)
>
> pyplot.plot(np.transpose(EchoA[0:nIts-1:echoPlotDec,:]),'.-')
>
> pyplot.plot(np.transpose(EchoA[nIts:2*nIts-1:echoPlotDec,:]),'*-')
>
>         pyplot.axis([0, 160, -0.5, 2])
>
> pyplot.savefig(dirname + '\\CoefsA.emf',format='emf')
>
>         pyplot.figure()
>
>         pyplot.hold(True)
>
>         pyplot.title("MaxAbs, Old = '.', New = '*' ")
>
> pyplot.xlabel("Iteration")
>
> pyplot.ylabel("o/p (LSBs)")
>
>         pyplot.grid(True)
>
>         pyplot.hold(True)
>
> pyplot.plot(np.transpose(MaxOld),'.-')
>
> pyplot.plot(np.transpose(MaxNew),'*-')
>
>         pyplot.axis([0, 2*nIts, 32, 128])
>
> pyplot.savefig(dirname + '\\MaxAbsA.emf',format='emf')
>
>         pyplot.figure()
>
>         pyplot.hold(True)
>
>         pyplot.title("MaxAbs")
>
> pyplot.xlabel("Iteration")
>
> pyplot.ylabel("(LSBs)")
>
>         pyplot.grid(True)
>
>         pyplot.hold(True)
>
> pyplot.plot(np.transpose(MaxSl),'.-')
>
>         pyplot.axis([0, 2*nIts, 0, 64])
>
> pyplot.savefig(dirname + '\\MaxAbsSl.emf',format='emf')
>
>         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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