Version Checks (indicate both or one)
Issue Description
Dear all,
I have run into issues with PyPSA, getting the following error messages when solving a large pypsa network with cplex:
This process (pid=2637151) is multi-threaded, use of fork() may lead to deadlocks in the child.
Afterwards, the script crashes, which I assume is due to fork being used instead of spawn.
When interrupting the process early, and continuing to work on the networks, I further get this error message:
ERROR! Session/line number was not unique in database. History logging moved to new session 2301
which appears to be a result of working on a process after forks have been created.
Do you have any idea, what could cause this, and how this could be addressed? With Highs, I did not encounter these issues.
Many thanks in advance!
Reproducible Example
import pypsa
n = pypsa.Network("resources/networks/base_s_adm_2190seg__2040.nc")
n.optimize(solver_name="cplex")Expected Behavior
network is solved and delivers results
Installed Versions
Details
- tqdm=4.67.1=pyhd8ed1ab_1
- traitlets=5.14.3=pyhd8ed1ab_1
- typing-extensions=4.15.0=h396c80c_0
- typing_extensions=4.15.0=pyhcf101f3_0
- typing_utils=0.1.0=pyhd8ed1ab_1
- tzdata=2025b=h78e105d_0
- ukkonen=1.0.1=py312hd9148b4_6
- unicodedata2=17.0.0=py312h4c3975b_0
- unidecode=1.4.0=pyhcf101f3_1
- uri-template=1.3.0=pyhd8ed1ab_1
- uriparser=0.9.8=hac33072_0
- urllib3=2.5.0=pyhd8ed1ab_0
- validators=0.35.0=pyhd8ed1ab_0
- virtualenv=20.35.4=pyhd8ed1ab_0
- wayland=1.24.0=hd6090a7_1
- wcwidth=0.2.14=pyhd8ed1ab_0
- webcolors=25.10.0=pyhd8ed1ab_0
- webencodings=0.5.1=pyhd8ed1ab_3
- websocket-client=1.9.0=pyhd8ed1ab_0
- wheel=0.45.1=pyhd8ed1ab_1
- widgetsnbextension=3.6.10=pyhd8ed1ab_0
- wrapt=1.17.3=py312h4c3975b_1
- xarray=2025.6.1=pyhd8ed1ab_1
- xcb-util=0.4.1=h4f16b4b_2
- xcb-util-cursor=0.1.5=hb9d3cd8_0
- xcb-util-image=0.4.0=hb711507_2
- xcb-util-keysyms=0.4.1=hb711507_0
- xcb-util-renderutil=0.3.10=hb711507_0
- xcb-util-wm=0.4.2=hb711507_0
- xerces-c=3.2.5=h988505b_2
- xkeyboard-config=2.46=hb03c661_0
- xlrd=2.0.2=pyhd8ed1ab_0
- xorg-libice=1.1.2=hb9d3cd8_0
- xorg-libsm=1.2.6=he73a12e_0
- xorg-libx11=1.8.12=h4f16b4b_0
- xorg-libxau=1.0.12=hb9d3cd8_0
- xorg-libxcomposite=0.4.6=hb9d3cd8_2
- xorg-libxcursor=1.2.3=hb9d3cd8_0
- xorg-libxdamage=1.1.6=hb9d3cd8_0
- xorg-libxdmcp=1.1.5=hb9d3cd8_0
- xorg-libxext=1.3.6=hb9d3cd8_0
- xorg-libxfixes=6.0.2=hb03c661_0
- xorg-libxi=1.8.2=hb9d3cd8_0
- xorg-libxinerama=1.1.5=h5888daf_1
- xorg-libxrandr=1.5.4=hb9d3cd8_0
- xorg-libxrender=0.9.12=hb9d3cd8_0
- xorg-libxtst=1.2.5=hb9d3cd8_3
- xorg-libxxf86vm=1.1.6=hb9d3cd8_0
- xorg-xorgproto=2024.1=hb9d3cd8_1
- xyzservices=2025.10.0=pyhd8ed1ab_0
- xz=5.8.1=hbcc6ac9_2
- xz-gpl-tools=5.8.1=hbcc6ac9_2
- xz-tools=5.8.1=hb9d3cd8_2
- yaml=0.2.5=h280c20c_3
- yarl=1.22.0=py312h8a5da7c_0
- yte=1.8.1=pyha770c72_0
- zeromq=4.3.5=h387f397_9
- zict=3.0.0=pyhd8ed1ab_1
- zipp=3.23.0=pyhd8ed1ab_0
- zlib=1.3.1=hb9d3cd8_2
- zlib-ng=2.2.5=hde8ca8f_0
- zstandard=0.25.0=py312h5253ce2_0
- zstd=1.5.7=hb8e6e7a_2
