Closed
Description
Bug report
Bug summary
Multiple different memory related errors when running as a part of script creating and saving lots of figures.
Code for reproduction
Sorry, could not create a minimal example that reproduces this. Just wanted to leave a note.
Actual outcome
There are multiple different errors that happen. Running the same script will produce different results randomly.
Example 1
Just prints this. No Exceptions, nothing. Script stops running.
unable to alloc 4320000 bytes
Example 2
File "c:\myapp\calculations\myscript.py", line 422, in create_figure
fig, ax = plt.subplots(nrows=1, figsize=(16, 9))
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\_api\deprecation.py", line 471, in wrapper
return func(*args, **kwargs)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\pyplot.py", line 1439, in subplots
fig = figure(**fig_kw)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\pyplot.py", line 797, in figure
manager = new_figure_manager(
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\pyplot.py", line 316, in new_figure_manager
return _backend_mod.new_figure_manager(*args, **kwargs)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backend_bases.py", line 3545, in new_figure_manager
return cls.new_figure_manager_given_figure(num, fig)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backends\_backend_tk.py", line 899, in new_figure_manager_given_figure
canvas = cls.FigureCanvas(figure, master=window)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\_api\deprecation.py", line 431, in wrapper
return func(*inner_args, **inner_kwargs)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backends\_backend_tk.py", line 174, in __init__
self._tkphoto = tk.PhotoImage(
File "C:\Python\Python 3.8.6-32\lib\tkinter\__init__.py", line 4061, in __init__
Image.__init__(self, 'photo', name, cnf, master, **kw)
File "C:\Python\Python 3.8.6-32\lib\tkinter\__init__.py", line 4006, in __init__
self.tk.call(('image', 'create', imgtype, name,) + options)
_tkinter.TclError: not enough free memory for image bufferExample 3
File "c:\myapp\calculations\myscript.py", line 467, in create_some_figures
plt.savefig(self.folder / "myfig.png")
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\pyplot.py", line 966, in savefig
res = fig.savefig(*args, **kwargs)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\figure.py", line 3005, in savefig
self.canvas.print_figure(fname, **kwargs)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backend_bases.py", line 2255, in print_figure
result = print_method(
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backend_bases.py", line 1669, in wrapper
return func(*args, **kwargs)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backends\backend_agg.py", line 508, in print_png
FigureCanvasAgg.draw(self)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backends\backend_agg.py", line 401, in draw
self.renderer = self.get_renderer(cleared=True)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backends\backend_agg.py", line 417, in get_renderer
self.renderer = RendererAgg(w, h, self.figure.dpi)
File "C:\Python\venvs\adiapp\lib\site-packages\matplotlib\backends\backend_agg.py", line 91, in __init__
self._renderer = _RendererAgg(int(width), int(height), dpi)
MemoryError: In RendererAgg: Out of memoryExpected outcome
No errors.
Matplotlib version
- Operating system: Windows 10
- Matplotlib version (
import matplotlib; print(matplotlib.__version__)): 3.4.2 - Matplotlib backend (
print(matplotlib.get_backend())): TkAgg - Python version: 32-bit 3.8.6
Workaround
As a side note, tried on version 3.3.4 and everything works. Does not work on 3.4.0. I'm calling
plt.close("all")
plt.close()
gc.collect()after every plt.savefig() just to be sure.