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Re: [Matplotlib-users] how to free resources
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From: Stano P. <sta...@gm...> - 2009-03-20 20:13:34
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Now it works like charm. Thank you for quick answer.
Stano.
On Fri, Mar 20, 2009 at 7:10 PM, Eric Firing <ef...@ha...> wrote:
> Stano Paška wrote:
>>
>> Hi,
>> I am using matplotlib first time and I am wonder how to free resources
>>
>> I have this script
>>
>> # coding: utf-8
>>
>> import matplotlib
>> matplotlib.use('Agg')
>>
>> import pylab
>>
>> class Graph:
>>
>> def __init__(self):
>> # sirka stlpcov
>> self.width = 0.5
>> self.font = {'fontname':'Tahoma', 'fontsize':10}
>>
>> def setTitle(self, title):
>> """Nastavi nadpis grafu
>> """
>> self.title = title
>>
>> def setXLabel(self, label):
>> self.x_label = label
>>
>> def setYLabel(self, label):
>> self.y_label = label
>>
>> def setYValues(self, values):
>> """Nastavi y-ove hodnoty
>> """
>> self.y_values = values
>> # vypocitame lave spodne rohy stlpcov
>> self.x_values = [x + self.width / 2 for x in
>> range(len(self.y_values))]
>> # vypocitame stred stlpcov (znacky na x-ovej osi)
>> self.x_ticks = [x + self.width for x in range(len(self.y_values))]
>>
>> def setXTickLabels(self, labels):
>> """Nastavi popisky pre ciarky na x-ovej osi
>> """
>> self.x_ticksLabels = labels
>>
>> def makeGraph(self):
>> self.fig = pylab.figure()
>> self.fig.set_dpi(72)
>> self.fig.set_figheight(3)
>> self.fig.set_figwidth(5)
>>
>> self.fig.subplots_adjust(bottom=0.15)
>>
>> self.ax = self.fig.add_subplot(111)
>>
>> self.ax.bar(left=self.x_values, height=self.y_values,
>> width=self.width, color='#f00000')
>> self.ax.set_xticks(self.x_ticks)
>> self.ax.set_xticklabels(self.x_ticksLabels)
>>
>> self.ax.set_xlabel(self.x_label, **self.font)
>> self.ax.set_ylabel(self.y_label, **self.font)
>> self.ax.set_title(self.title, **self.font)
>>
>> def saveGraph(self, path):
>> self.fig.savefig(path, format='png')
>>
>> def __del__(self):
>> self.fig.delaxes(self.ax)
>> del self.fig
>> del self.ax
>>
>> if __name__ == '__main__':
>> import random
>> import gc
>> for i in range(5000):
>> g = Graph()
>> g.setTitle(u'Spotreba za rok 2008 podľa ATC skupín')
>> g.setXLabel(u'ATC skupiny')
>> g.setYLabel(u'Spotreba v EUR')
>> g.setYValues([random.randint(0, x) for x in range(20)])
>> g.setXTickLabels([chr(random.randint(65, 90)) for x in range(20)])
>> g.makeGraph()
>> g.saveGraph('grafy/' + str(i) + '.png')
>> del g
>> print gc.get_count()
>> gc.collect()
>> print gc.get_count()
>>
>> When I used TkAgg, it crashes after 190 images (Fail to create pixmap
>> with Tk_GetPixmap in ImgPhotoInstanceSetSize. tried to delete photo
>> image when instances still exist).
>> When I switch to WX, it crashes after 400 images.
>> And Agg crashes when pagefile reaches 1.5x ram (cca 2000 images).
>>
>> It is possible somehow free resources in matplotlib?
>
> You need to close the figure. Try putting
> pylab.close(self.fig) at the start of your __del__ method. In fact, I doubt
> you need to explicitly del anything in that method--you just need to close
> the figure so that pylab will release its references related to that figure.
>
> There may be more things you need to change, but closing the figure is
> certainly going to be a big one.
>
> Eric
>
>>
>> I use python 2.5.4, wx 2.8.9.2, numpy 1.3.0b1 on win XP
>>
>> Thanks for answers.
>>
>> Stano.
>>
>>
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>
>
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