diff --git a/Misc/NEWS.d/next/Tests/2023-02-11-20-28-08.gh-issue-89792.S-Y5BZ.rst b/Misc/NEWS.d/next/Tests/2023-02-11-20-28-08.gh-issue-89792.S-Y5BZ.rst
index a3a3070d7f3790..9de278919ef2f8 100644
--- a/Misc/NEWS.d/next/Tests/2023-02-11-20-28-08.gh-issue-89792.S-Y5BZ.rst
+++ b/Misc/NEWS.d/next/Tests/2023-02-11-20-28-08.gh-issue-89792.S-Y5BZ.rst
@@ -1,3 +1,4 @@
-``test_tools`` now copies up to 10x less source data to a temporary
-directory during the ``freeze`` test by ignoring git metadata and other
-artifacts.
+``test_tools`` now copies up to 10x less source data to a temporary directory
+during the ``freeze`` test by ignoring git metadata and other artifacts. It
+also limits its python build parallelism based on os.cpu_count instead of hard
+coding it as 8 cores.
diff --git a/Tools/freeze/test/freeze.py b/Tools/freeze/test/freeze.py
index 0ae983b15c98f0..b4c76ff36a873b 100644
--- a/Tools/freeze/test/freeze.py
+++ b/Tools/freeze/test/freeze.py
@@ -163,16 +163,25 @@ def prepare(script=None, outdir=None):
if not MAKE:
raise UnsupportedError('make')
+ cores = os.cpu_count()
+ if cores and cores >= 3:
+ # this test is most often run as part of the whole suite with a lot
+ # of other tests running in parallel, from 1-2 vCPU systems up to
+ # people's NNN core beasts. Don't attempt to use it all.
+ parallel = f'-j{cores*2//3}'
+ else:
+ parallel = '-j2'
+
# Build python.
- print(f'building python in {builddir}...')
+ print(f'building python {parallel=} in {builddir}...')
if os.path.exists(os.path.join(srcdir, 'Makefile')):
# Out-of-tree builds require a clean srcdir.
_run_quiet([MAKE, '-C', srcdir, 'clean'])
- _run_quiet([MAKE, '-C', builddir, '-j8'])
+ _run_quiet([MAKE, '-C', builddir, parallel])
# Install the build.
print(f'installing python into {prefix}...')
- _run_quiet([MAKE, '-C', builddir, '-j8', 'install'])
+ _run_quiet([MAKE, '-C', builddir, 'install'])
python = os.path.join(prefix, 'bin', 'python3')
return outdir, scriptfile, python
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