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[Bug]: Memory leak in 3.4.3 #21259

Closed
Closed
Milestone
@jmakov

Description

@jmakov

Bug summary

As reported injupyterlab/jupyterlab#11182, running below code with a 30M row data frame (pandas) only increases memory.

Code for reproduction

%matplotlibwidget# with this commented out or not, same resultimportmodin.pandasaspdimportmatplotlib.pyplotasplt# get your dfplt.rcParams["figure.figsize"]= [40,15]plt.rcParams["figure.autolayout"]=True# plt.cla()  # with this commented out or not, same result# plt.clf()  # with this commented out or not, same result# plt.close(fig)  # with this commented out or not, same result# this works but then of course the figure is empty# import gc# fig.clear()  # also this must be commented out on the second run since on the first one it's not defined# gc.collect()fig,axs=plt.subplots(1,1,sharex=True)# fig.clear()  # draws only one plot, still leaksaxs.plot(df[df.columns[0]],color="black")ax1=axs.twinx()ax1.plot(df[df.columns[1]],color="blue")# with this 2 lines commented out or not, same resultfig.tight_layout()plt.show()

Actual outcome

Memory only increases.

Expected outcome

No memory leak prefferably.

Operating system

Ubuntu 21.04

Matplotlib Version

3.4.3

Matplotlib Backend

Qt5Agg, same with%matplotlib and%matplotlib widget

Python version

3.7.10

Jupyter version

3.1.11

Other libraries

Conda'senv.yaml:

name:testchannels:  - pyviz  - conda-forge  - defaultsdependencies:  - _libgcc_mutex=0.1=conda_forge  - _openmp_mutex=4.5=1_gnu  - abseil-cpp=20210324.2=h9c3ff4c_0  - alembic=1.7.3=pyhd8ed1ab_0  - alsa-lib=1.2.3=h516909a_0  - anyio=3.3.0=py37h89c1867_0  - argcomplete=1.12.3=pyhd8ed1ab_2  - argon2-cffi=20.1.0=py37h5e8e339_2  - arrow-cpp=5.0.0=py37hdf48254_5_cpu  - async_generator=1.10=py_0  - attrs=21.2.0=pyhd8ed1ab_0  - autopage=0.4.0=pyhd8ed1ab_0  - aws-c-cal=0.5.11=h95a6274_0  - aws-c-common=0.6.2=h7f98852_0  - aws-c-event-stream=0.2.7=h3541f99_13  - aws-c-io=0.10.5=hfb6a706_0  - aws-checksums=0.1.11=ha31a3da_7  - aws-sdk-cpp=1.8.186=hb4091e7_3  - babel=2.9.1=pyh44b312d_0  - backcall=0.2.0=pyh9f0ad1d_0  - backports=1.0=py_2  - backports.functools_lru_cache=1.6.4=pyhd8ed1ab_0  - backports.zoneinfo=0.2.1=py37h5e8e339_4  - bleach=4.1.0=pyhd8ed1ab_0  - bokeh=2.3.3=py37h89c1867_0  - brotlipy=0.7.0=py37h5e8e339_1001  - bzip2=1.0.8=h7f98852_4  - c-ares=1.17.2=h7f98852_0  - ca-certificates=2021.5.30=ha878542_0  - certifi=2021.5.30=py37h89c1867_0  - cffi=1.14.6=py37hc58025e_0  - chardet=4.0.0=py37h89c1867_1  - charset-normalizer=2.0.0=pyhd8ed1ab_0  - click=8.0.1=py37h89c1867_0  - clickhouse-cityhash=1.0.2.3=py37h3340039_2  - clickhouse-driver=0.2.1=py37h5e8e339_0  - cliff=3.9.0=pyhd8ed1ab_0  - cloudpickle=2.0.0=pyhd8ed1ab_0  - cmaes=0.8.2=pyh44b312d_0  - cmd2=2.2.0=py37h89c1867_0  - colorama=0.4.4=pyh9f0ad1d_0  - colorcet=2.0.6=pyhd8ed1ab_0  - colorlog=6.4.1=py37h89c1867_0  - conda=4.10.3=py37h89c1867_1  - conda-package-handling=1.7.3=py37h5e8e339_0  - cramjam=2.3.1=py37h5e8e339_1  - cryptography=3.4.7=py37h5d9358c_0  - cycler=0.10.0=py_2  - cytoolz=0.11.0=py37h5e8e339_3  - dask=2021.9.0=pyhd8ed1ab_0  - dask-core=2021.9.0=pyhd8ed1ab_0  - datashader=0.13.0=pyh6c4a22f_0  - datashape=0.5.4=py_1  - dbus=1.13.6=h48d8840_2  - debugpy=1.4.1=py37hcd2ae1e_0  - decorator=5.1.0=pyhd8ed1ab_0  - defusedxml=0.7.1=pyhd8ed1ab_0  - distributed=2021.9.0=py37h89c1867_0  - entrypoints=0.3=py37hc8dfbb8_1002  - expat=2.4.1=h9c3ff4c_0  - fastparquet=0.7.1=py37hb1e94ed_0  - filelock=3.0.12=pyh9f0ad1d_0  - fontconfig=2.13.1=hba837de_1005  - freetype=2.10.4=h0708190_1  - fsspec=2021.8.1=pyhd8ed1ab_0  - gettext=0.19.8.1=h0b5b191_1005  - gflags=2.2.2=he1b5a44_1004  - gitdb=4.0.7=pyhd8ed1ab_0  - gitpython=3.1.23=pyhd8ed1ab_1  - glib=2.68.4=h9c3ff4c_0  - glib-tools=2.68.4=h9c3ff4c_0  - glog=0.5.0=h48cff8f_0  - greenlet=1.1.1=py37hcd2ae1e_0  - grpc-cpp=1.40.0=h850795e_0  - gst-plugins-base=1.18.5=hf529b03_0  - gstreamer=1.18.5=h76c114f_0  - heapdict=1.0.1=py_0  - holoviews=1.14.5=py_0  - hvplot=0.7.3=py_0  - icu=68.1=h58526e2_0  - idna=3.1=pyhd3deb0d_0  - importlib-metadata=4.8.1=py37h89c1867_0  - importlib_metadata=4.8.1=hd8ed1ab_0  - importlib_resources=5.2.2=pyhd8ed1ab_0  - ipykernel=6.4.1=py37h6531663_0  - ipympl=0.7.0=pyhd8ed1ab_0  - ipython=7.27.0=py37h6531663_0  - ipython_genutils=0.2.0=py_1  - ipywidgets=7.6.5=pyhd8ed1ab_0  - jbig=2.1=h7f98852_2003  - jedi=0.18.0=py37h89c1867_2  - jinja2=3.0.1=pyhd8ed1ab_0  - joblib=1.0.1=pyhd8ed1ab_0  - jpeg=9d=h36c2ea0_0  - json5=0.9.5=pyh9f0ad1d_0  - jsonschema=3.2.0=py37hc8dfbb8_1  - jupyter-server-mathjax=0.2.3=pyhd8ed1ab_0  - jupyter_client=7.0.2=pyhd8ed1ab_0  - jupyter_contrib_core=0.3.3=py_2  - jupyter_contrib_nbextensions=0.5.1=py37hc8dfbb8_1  - jupyter_core=4.7.1=py37h89c1867_0  - jupyter_highlight_selected_word=0.2.0=py37h89c1867_1002  - jupyter_latex_envs=1.4.6=py37h89c1867_1001  - jupyter_nbextensions_configurator=0.4.1=py37h89c1867_2  - jupyter_server=1.11.0=pyhd8ed1ab_0  - jupyterlab=3.1.11=pyhd8ed1ab_0  - jupyterlab-git=0.32.2=pyhd8ed1ab_0  - jupyterlab_pygments=0.1.2=pyh9f0ad1d_0  - jupyterlab_server=2.8.1=pyhd8ed1ab_0  - jupyterlab_widgets=1.0.2=pyhd8ed1ab_0  - kiwisolver=1.3.2=py37h2527ec5_0  - krb5=1.19.2=hcc1bbae_0  - lcms2=2.12=hddcbb42_0  - ld_impl_linux-64=2.36.1=hea4e1c9_2  - lerc=2.2.1=h9c3ff4c_0  - libarchive=3.5.2=hccf745f_0  - libblas=3.9.0=11_linux64_openblas  - libbrotlicommon=1.0.9=h7f98852_5  - libbrotlidec=1.0.9=h7f98852_5  - libbrotlienc=1.0.9=h7f98852_5  - libcblas=3.9.0=11_linux64_openblas  - libclang=11.1.0=default_ha53f305_1  - libcurl=7.78.0=h2574ce0_0  - libdeflate=1.7=h7f98852_5  - libedit=3.1.20191231=he28a2e2_2  - libev=4.33=h516909a_1  - libevent=2.1.10=hcdb4288_3  - libffi=3.3=h58526e2_2  - libgcc-ng=11.1.0=hc902ee8_8  - libgfortran-ng=11.1.0=h69a702a_8  - libgfortran5=11.1.0=h6c583b3_8  - libglib=2.68.4=h3e27bee_0  - libgomp=11.1.0=hc902ee8_8  - libiconv=1.16=h516909a_0  - liblapack=3.9.0=11_linux64_openblas  - libllvm11=11.1.0=hf817b99_2  - libnghttp2=1.43.0=h812cca2_0  - libogg=1.3.4=h7f98852_1  - libopenblas=0.3.17=pthreads_h8fe5266_1  - libopus=1.3.1=h7f98852_1  - libpng=1.6.37=h21135ba_2  - libpq=13.3=hd57d9b9_0  - libprotobuf=3.16.0=h780b84a_0  - libsodium=1.0.18=h36c2ea0_1  - libsolv=0.7.19=h780b84a_5  - libssh2=1.10.0=ha56f1ee_0  - libstdcxx-ng=11.1.0=h56837e0_8  - libta-lib=0.4.0=h516909a_0  - libthrift=0.14.2=he6d91bd_1  - libtiff=4.3.0=hf544144_1  - libutf8proc=2.6.1=h7f98852_0  - libuuid=2.32.1=h7f98852_1000  - libuv=1.42.0=h7f98852_0  - libvorbis=1.3.7=h9c3ff4c_0  - libwebp-base=1.2.1=h7f98852_0  - libxcb=1.13=h7f98852_1003  - libxkbcommon=1.0.3=he3ba5ed_0  - libxml2=2.9.12=h72842e0_0  - libxslt=1.1.33=h15afd5d_2  - llvmlite=0.37.0=py37h9d7f4d0_0  - locket=0.2.0=py_2  - lxml=4.6.3=py37h77fd288_0  - lz4-c=1.9.3=h9c3ff4c_1  - lzo=2.10=h516909a_1000  - mako=1.1.5=pyhd8ed1ab_0  - mamba=0.15.3=py37h7f483ca_0  - markdown=3.3.4=pyhd8ed1ab_0  - markupsafe=2.0.1=py37h5e8e339_0  - matplotlib=3.4.3=py37h89c1867_0  - matplotlib-base=3.4.3=py37h1058ff1_0  - matplotlib-inline=0.1.3=pyhd8ed1ab_0  - mistune=0.8.4=py37h5e8e339_1004  - modin-core=0.10.2=py37h89c1867_3  - modin-ray=0.10.2=py37h89c1867_3  - msgpack-python=1.0.2=py37h2527ec5_1  - multipledispatch=0.6.0=py_0  - mysql-common=8.0.25=ha770c72_2  - mysql-libs=8.0.25=hfa10184_2  - nb_conda_kernels=2.3.1=py37h89c1867_0  - nbclassic=0.3.1=pyhd8ed1ab_1  - nbclient=0.5.4=pyhd8ed1ab_0  - nbconvert=6.1.0=py37h89c1867_0  - nbdime=3.1.0=pyhd8ed1ab_0  - nbformat=5.1.3=pyhd8ed1ab_0  - ncurses=6.2=h58526e2_4  - nest-asyncio=1.5.1=pyhd8ed1ab_0  - notebook=6.4.3=pyha770c72_0  - nspr=4.30=h9c3ff4c_0  - nss=3.69=hb5efdd6_0  - numba=0.54.0=py37h2d894fd_0  - numpy=1.20.3=py37h038b26d_1  - olefile=0.46=pyh9f0ad1d_1  - openjpeg=2.4.0=hb52868f_1  - openssl=1.1.1l=h7f98852_0  - optuna=2.9.1=pyhd8ed1ab_0  - orc=1.6.10=h58a87f1_0  - packaging=21.0=pyhd8ed1ab_0  - pandas=1.3.2=py37he8f5f7f_0  - pandoc=2.14.2=h7f98852_0  - pandocfilters=1.4.2=py_1  - panel=0.12.1=py_0  - param=1.11.1=pyh6c4a22f_0  - parquet-cpp=1.5.1=1  - parso=0.8.2=pyhd8ed1ab_0  - partd=1.2.0=pyhd8ed1ab_0  - patsy=0.5.2=pyhd8ed1ab_0  - pbr=5.6.0=pyhd8ed1ab_0  - pcre=8.45=h9c3ff4c_0  - pexpect=4.8.0=py37hc8dfbb8_1  - pickle5=0.0.11=py37h5e8e339_0  - pickleshare=0.7.5=py37hc8dfbb8_1002  - pillow=8.3.2=py37h0f21c89_0  - pip=21.2.4=pyhd8ed1ab_0  - prettytable=2.2.0=pyhd8ed1ab_0  - prometheus_client=0.11.0=pyhd8ed1ab_0  - prompt-toolkit=3.0.20=pyha770c72_0  - psutil=5.8.0=py37h5e8e339_1  - pthread-stubs=0.4=h36c2ea0_1001  - ptyprocess=0.7.0=pyhd3deb0d_0  - pyarrow=5.0.0=py37h58331f5_5_cpu  - pycosat=0.6.3=py37h5e8e339_1006  - pycparser=2.20=pyh9f0ad1d_2  - pyct=0.4.6=py_0  - pyct-core=0.4.6=py_0  - pygments=2.10.0=pyhd8ed1ab_0  - pykalman=0.9.5=py_1  - pyopenssl=20.0.1=pyhd8ed1ab_0  - pyparsing=2.4.7=pyh9f0ad1d_0  - pyperclip=1.8.2=pyhd8ed1ab_2  - pyqt=5.12.3=py37h89c1867_7  - pyqt-impl=5.12.3=py37he336c9b_7  - pyqt5-sip=4.19.18=py37hcd2ae1e_7  - pyqtchart=5.12=py37he336c9b_7  - pyqtwebengine=5.12.1=py37he336c9b_7  - pyrsistent=0.17.3=py37h5e8e339_2  - pysocks=1.7.1=py37h89c1867_3  - python=3.7.10=hffdb5ce_100_cpython  - python-dateutil=2.8.2=pyhd8ed1ab_0  - python_abi=3.7=2_cp37m  - pytz=2021.1=pyhd8ed1ab_0  - pyviz_comms=2.1.0=py_0  - pyyaml=5.4.1=py37h5e8e339_1  - pyzmq=22.2.1=py37h336d617_0  - qt=5.12.9=hda022c4_4  - ray-core=1.6.0=py37hf931bba_0  - re2=2021.09.01=h9c3ff4c_0  - readline=8.1=h46c0cb4_0  - redis-py=3.5.3=pyh9f0ad1d_0  - reproc=14.2.3=h7f98852_0  - reproc-cpp=14.2.3=h9c3ff4c_0  - requests=2.26.0=pyhd8ed1ab_0  - requests-unixsocket=0.2.0=py_0  - ruamel_yaml=0.15.80=py37h5e8e339_1004  - s2n=1.0.10=h9b69904_0  - scikit-learn=0.24.2=py37hf0f1638_1  - send2trash=1.8.0=pyhd8ed1ab_0  - setproctitle=1.1.10=py37h5e8e339_1004  - setuptools=58.0.4=py37h89c1867_0  - six=1.16.0=pyh6c4a22f_0  - smmap=3.0.5=pyh44b312d_0  - snappy=1.1.8=he1b5a44_3  - sniffio=1.2.0=py37h89c1867_1  - sortedcontainers=2.4.0=pyhd8ed1ab_0  - sqlalchemy=1.4.25=py37h5e8e339_0  - sqlite=3.36.0=h9cd32fc_1  - statsmodels=0.12.2=py37hb1e94ed_0  - stevedore=3.4.0=py37h89c1867_0  - ta-lib=0.4.19=py37ha21ca33_2  - tabulate=0.8.9=pyhd8ed1ab_0  - tblib=1.7.0=pyhd8ed1ab_0  - tensorboardx=2.4=pyhd8ed1ab_0  - terminado=0.12.1=py37h89c1867_0  - testpath=0.5.0=pyhd8ed1ab_0  - threadpoolctl=2.2.0=pyh8a188c0_0  - thrift=0.13.0=py37hcd2ae1e_2  - tk=8.6.11=h27826a3_1  - toolz=0.11.1=py_0  - tornado=6.1=py37h5e8e339_1  - tqdm=4.62.2=pyhd8ed1ab_0  - traitlets=5.1.0=pyhd8ed1ab_0  - typing_extensions=3.10.0.0=pyha770c72_0  - tzdata=2021a=he74cb21_1  - tzlocal=3.0=py37h89c1867_2  - urllib3=1.26.6=pyhd8ed1ab_0  - wcwidth=0.2.5=pyh9f0ad1d_2  - webencodings=0.5.1=py_1  - websocket-client=0.57.0=py37h89c1867_4  - wheel=0.37.0=pyhd8ed1ab_1  - widgetsnbextension=3.5.1=py37h89c1867_4  - xarray=0.19.0=pyhd8ed1ab_1  - xeus=2.0.0=h7d0c39e_0  - xeus-python=0.13.0=py37h4b46df4_1  - xeus-python-shell=0.1.5=pyhd8ed1ab_0  - xorg-libxau=1.0.9=h7f98852_0  - xorg-libxdmcp=1.1.3=h7f98852_0  - xz=5.2.5=h516909a_1  - yaml=0.2.5=h516909a_0  - zeromq=4.3.4=h9c3ff4c_1  - zict=2.0.0=py_0  - zipp=3.5.0=pyhd8ed1ab_0  - zlib=1.2.11=h516909a_1010  - zstandard=0.15.2=py37h5e8e339_0  - zstd=1.5.0=ha95c52a_0  - pip:    - absl-py==0.13.0    - aiohttp==3.7.4.post0    - aiohttp-cors==0.7.0    - aioredis==1.3.1    - async-timeout==3.0.1    - autograd==1.3    - bayesian-optimization==1.2.0    - blessings==1.7    - cachetools==4.2.2    - cma==2.7.0    - colorful==0.5.4    - cython==0.29.24    - future==0.18.2    - google-api-core==1.31.2    - google-auth==1.35.0    - google-auth-oauthlib==0.4.6    - googleapis-common-protos==1.53.0    - gpustat==0.6.0    - gpy==1.10.0    - gpytorch==1.5.1    - grpcio==1.40.0    - hebo==0.1.0    - hiredis==2.0.0    - multidict==5.1.0    - nevergrad==0.4.3.post8    - nvidia-ml-py3==7.352.0    - oauthlib==3.1.1    - opencensus==0.7.13    - opencensus-context==0.1.2    - paramz==0.9.5    - protobuf==3.17.3    - py-spy==0.3.9    - pyasn1==0.4.8    - pyasn1-modules==0.2.8    - pymoo==0.4.2.2    - requests-oauthlib==1.3.0    - rsa==4.7.2    - scipy==1.5.4    - sklearn==0.0    - tensorboard==2.6.0    - tensorboard-data-server==0.6.1    - tensorboard-plugin-wit==1.8.0    - torch==1.9.1    - werkzeug==2.0.1    - yarl==1.6.3

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