matplotlib eats all memory when saving fig matplotlib eats all memory when saving fig

The solution for “matplotlib eats all memory when saving fig matplotlib eats all memory when saving fig” can be found here. The following code will assist you in solving the problem.

fig = plt.figure(num=1, clear=True)

for i in tqdm(range(55238, len(df)-40)):
df_tmp = df.iloc[i:i+30]
name = f’data/{i+30+1}’
generate_picture(df_tmp, name, fig)
gc.collect()import matplotlib.pyplot as plt
import numpy as np

A = np.arange(1,5)
B = A**2

cnt=0
while(1):
cnt = cnt+1
print(“########### test %d ###########” % cnt)

# here is the trick:
# set the figure a ‘num’ to prevent from re-malloc of a figure in the next loop
# and set “clear=True” to make the figure clear
# I never use plt.close() to kill the figure, because I found it doesn’t work.
# Only one figure is allocated, which can be self-released when the program quits.
# Before: 6000 times calling of plt.figure() ~ about 1.6GB of memory leak
# Now: the memory keeps in a stable level
fig = plt.figure(num=1, clear=True)
ax = fig.add_subplot()

# alternatively use an other function in one line
# fig, ax = plt.subplots(num=1,clear=True)

ax.plot(A,B)
ax.plot(B,A)

# Here add the functions you need
# plt.show()
fig.savefig(‘%d.png’ % cnt)

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