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Allow restriction of number of threads when building pytket using cmake. #1180

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merged 2 commits into from
Jan 3, 2024
Merged

Allow restriction of number of threads when building pytket using cmake. #1180

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51a4771
Allow restriction of number of threads when building pytket using cmake.
cqc-alec Dec 15, 2023
289654c
Merge branch 'develop' into feature/pytketthreads
cqc-alec Jan 2, 2024
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4 changes: 4 additions & 0 deletions build-without-conan.md
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Original file line number Diff line number Diff line change
Expand Up @@ -255,3 +255,7 @@ This needs the shared `tklog` and `tket` libraries to be installed.
cd ${TKET_DIR}/pytket
NO_CONAN=1 pip install -v -e .
```

(You can use the environment variable `PYTKET_CMAKE_N_THREADS` to restrict the
number of threads used in the above command; otherwise one thread per CPU is
used.)
7 changes: 6 additions & 1 deletion pytket/setup.py
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Expand Up @@ -65,7 +65,12 @@ def run(self):
["cmake", f"-DCMAKE_INSTALL_PREFIX={install_dir}", os.pardir], cwd=build_dir
)
subprocess.run(
["cmake", "--build", os.curdir, f"-j{multiprocessing.cpu_count()}"],
[
"cmake",
"--build",
os.curdir,
f"-j{os.getenv('PYTKET_CMAKE_N_THREADS', multiprocessing.cpu_count())}",
],
cwd=build_dir,
)
subprocess.run(["cmake", "--install", os.curdir], cwd=build_dir)
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