python loop increases its memory usage rapidly -


i have python script runs loop. within loop, function dodebuginfo called, once per loop iteration. function prints pictures hard disk using matplotlib, export kml file , other calculations, , returns nothing.

i'm having problem python, each run, function dodebuginfo eats more , more ram. guess variable increasing it's size on each loop.

i added following lines before , after call: 

print '=== before: ' + str(resource.getrusage(resource.rusage_self).ru_maxrss / 1000) dodebuginfo(inputs) print '=== after: ' + str(resource.getrusage(resource.rusage_self).ru_maxrss / 1000)

the output is:

=== before: 71598.08 === after: 170237.952 === before: 170237.952 === after: 255696.896 === before: 255696.896 === after: 341409.792

as can see, before call program has memory footprint, , after call increases, stays stable until before next call.

why this? since dodebuginfo(inputs) function returns nothing, how can variables stay on memory? there need clear variables @ end of function?

edit: dodebuginfo imports functions:

def plot_line(x,y,kind,lab_x,lab_y,filename):     fig = plt.figure(figsize=(11,6),dpi=300)     ax = fig.add_subplot(111)     ax.grid(true,which='both')     #print 'plotting'     if type(x[0]) datetime.datetime:         #print 'datetime detected'         ax.plot_date(matplotlib.dates.date2num(x),y,kind)         ax.fmt_xdata = dateformatter('%h')         ax.autoscale_view()         fig.autofmt_xdate()     else:            #print 'no datetime'         ax.plot(x,y,kind)     xlabel = ax.set_xlabel(lab_x)     ax.set_ylabel(lab_y)     fig.savefig(filename,bbox_extra_artists=[xlabel], bbox_inches='tight')  def plot_hist(x,nbins,lab_x,lab_y,filename):     fig = plt.figure(figsize=(11,6),dpi=300)     ax = fig.add_subplot(111)     ax.grid(true,which='both')     ax.hist(x,nbins)     xlabel = ax.set_xlabel(lab_x)     ax.set_ylabel(lab_y)     fig.savefig(filename,bbox_extra_artists=[xlabel], bbox_inches='tight')

and plots 10 figures disk using like: 

plot_line(index,alt,'-','drive index','altitude in m',output_dir + 'name.png')

if comment lines use plot_line problem not happen, leak should on lines of code.

thanks

the problem relies on many figures being created , never closed. somehow python keeps them alive.

i added line 

plt.close()

to each of plot functions plot_line , plot_hist , problem gone.


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