Closed
Description
SO : http://stackoverflow.com/questions/27295220/matplotlib-simple-case-memory-leak-with-pandas
Seems to be a leak memory bug with pandas.plot. It works well with plt.plot(df.index, df.test) (see below)
Simple case here :
import sys
import gc
import numpy as np
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import pandas as pd
pdindex = pd.date_range(start='01/01/2013', freq='15min', end='01/01/2019')
df = pd.DataFrame({'test':np.random.normal(0,1,len(pdindex))}, index=pdindex)
def memplot_plot(df, i):
df.test.plot()
plt.title('graph' + str(i))
plt.savefig(str(i) + '.png', dpi=144)
plt.close()
for i in range(1, 100):
print '*******************************'
print 'i : ' + str(i)
print len( gc.get_objects())
print sys.getsizeof(gc.get_objects())
memplot_plot(df, i)
gc.collect()
And the output is (memory error as of i=6):
*******************************
i : 1
74682
325680
*******************************
i : 2
290627
1190248
*******************************
i : 3
506420
2145012
*******************************
i : 4
721993
3054204
*******************************
i : 5
937566
3865524
*******************************
i : 6
1153139
4892352
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Anaconda\lib\site- packages\spyderlib\widgets\externalshell\sitecustomize.py", line 580, in runfile
execfile(filename, namespace)
File "C:/PERSO/script_backtesting.py", line 124, in <module>
memplot_plot(df, i)
File "C:/PERSO/script_backtesting.py", line 107, in memplot_plot
plt.savefig(str(i) + '.png', dpi=144)
File "C:\Anaconda\lib\site-packages\matplotlib\pyplot.py", line 576, in savefig
res = fig.savefig(*args, **kwargs)
File "C:\Anaconda\lib\site-packages\matplotlib\figure.py", line 1470, in savefig
self.canvas.print_figure(*args, **kwargs)
File "C:\Anaconda\lib\site-packages\matplotlib\backend_bases.py", line 2192, in print_figure
**kwargs)
File "C:\Anaconda\lib\site-packages\matplotlib\backends\backend_agg.py", line 513, in print_png
FigureCanvasAgg.draw(self)
File "C:\Anaconda\lib\site-packages\matplotlib\backends\backend_agg.py", line 461, in draw
self.figure.draw(self.renderer)
File "C:\Anaconda\lib\site-packages\matplotlib\artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Anaconda\lib\site-packages\matplotlib\figure.py", line 1079, in draw
func(*args)
File "C:\Anaconda\lib\site-packages\matplotlib\artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Anaconda\lib\site-packages\matplotlib\axes\_base.py", line 2092, in draw
a.draw(renderer)
File "C:\Anaconda\lib\site-packages\matplotlib\artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Anaconda\lib\site-packages\matplotlib\axis.py", line 1103, in draw
ticks_to_draw = self._update_ticks(renderer)
File "C:\Anaconda\lib\site-packages\matplotlib\axis.py", line 957, in _update_ticks
tick_tups = [t for t in self.iter_ticks()]
File "C:\Anaconda\lib\site-packages\matplotlib\axis.py", line 903, in iter_ticks
self.major.formatter.set_locs(majorLocs)
File "C:\Anaconda\lib\site-packages\pandas\tseries\converter.py", line 982, in set_locs
self._set_default_format(vmin, vmax)
File "C:\Anaconda\lib\site-packages\pandas\tseries\converter.py", line 966, in _set_default_format
format = np.compress(info['maj'], info)
File "C:\Anaconda\lib\site-packages\numpy\core\fromnumeric.py", line 1563, in compress
return compress(condition, axis, out)
MemoryError
Graph of the memory for the computer from launch the script to breack and to kill the console.
