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Description
Environment
- Pythonnet version: 3.0.0rc3
- Python version: 3.10.5
- Operating System: Windows 10 20H2
- .NET Runtime: 6.0.6
Details
- Describe what you were trying to get done.
Create dotnet-object and delete it. If I do that a lot I get memory issues. It seems the never get cleared by the Python- or dotnet-gc. This is not a problem in pythonnet 2.5.2
- What commands did you run to trigger this issue?
import gc
import clr
import psutil
import matplotlib.pyplot as plt
import System
# Create dict store count of objects left
types = [
str,
System.String,
]
types = {obj: 0 for obj in types}
N = 1_000
str_size = 1_000_000
memory_py = [0 for _ in range(N + 2)]
memory_py[0] = psutil.virtual_memory().used
for ii in range(N):
s_py = str('a' * str_size)
del s_py
memory_py[ii + 1] = psutil.virtual_memory().used - memory_py[0]
gc.collect()
# See what types of objects are still present
for obj in gc.get_objects():
if type(obj) in list(types.keys()):
types[type(obj)] += 1
print(types)
memory_py[ii + 2] = psutil.virtual_memory().used - memory_py[0]
memory_py[0] = 0{<class 'str'>: 0, <class 'System.String'>: 0}
memory_net = [0 for _ in range(N + 2)]
memory_net[0] = psutil.virtual_memory().used
s_py = str('a' * str_size)
for ii in range(N):
s_net = System.String(s_py)
del s_net
memory_net[ii + 1] = psutil.virtual_memory().used - memory_net[0]
gc.collect()
# See what types of objects are still present
for obj in gc.get_objects():
if type(obj) in list(types.keys()):
types[type(obj)] += 1
print(types)
memory_net[ii + 2] = psutil.virtual_memory().used - memory_net[0]
memory_net[0] = 0{<class 'str'>: 0, <class 'System.String'>: 1000}
You can also visualize the memory consumption:
fig, ax = plt.subplots()
ax.plot(memory_py, label='Python object')
ax.plot(memory_net, label='DotNet object')
ax.legend()
plt.show(fig)
You can execute the same code with pythonnet 2.5.2 (Python 3.9.13) and get the following figure
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