[Matplotlib-users] Matplotlib eating memory

[Martin M. <mmo...@gm...>]

Hi,
  rendering some of my charts takes almost 50GB of RAM. I believe below is a stracktrace
of one such situation when it already took 15GB. Would somebody comments on what is
matplotlib doing at the very moment? Why the recursion?

  The charts had to have 262422 data points in a 2D scatter plot, each point has assigned
its own color. They are in batches so that there are 153 distinct colors but nevertheless,
I assigned to each data point a color value. There are 153 legend items also (one color
won't be used).

^CTraceback (most recent call last):
...
    _figure.savefig(filename, dpi=100)
  File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 1421, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/backend_bases.py", line 2220, in print_figure
    **kwargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 505, in print_png
    FigureCanvasAgg.draw(self)
  File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 451, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 1034, in draw
    func(*args)
  File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/axes.py", line 2086, in draw
    a.draw(renderer)
  File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/collections.py", line 718, in draw
    return Collection.draw(self, renderer)
  File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/collections.py", line 276, in draw
    offsets, transOffset, self.get_facecolor(), self.get_edgecolor(),
  File "/usr/lib64/python2.7/site-packages/matplotlib/collections.py", line 551, in get_edgecolor
    return self._edgecolors
KeyboardInterrupt
^CError in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/_pylab_helpers.py", line 90, in destroy_all
    gc.collect()
KeyboardInterrupt
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/_pylab_helpers.py", line 90, in destroy_all
    gc.collect()
KeyboardInterrupt

^C


Clues what is the code doing? I use mpl-1.3.0.
Thank you,
Martin