commit: befc788bee3b01eaff416ed9a52041e63b3bbea8
Author: Eli Schwartz <eschwartz <AT> gentoo <DOT> org>
AuthorDate: Sun Jan 4 20:08:35 2026 +0000
Commit: Eli Schwartz <eschwartz <AT> gentoo <DOT> org>
CommitDate: Sun Jan 4 20:19:36 2026 +0000
URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=befc788b
dev-python/cython: suppress OpenMP parallelism in tests
We already pass MAKEOPTS parallelism to the testsuite's -j option. Some
of the tests also internally use OpenMP, and implicitly parallelize
according to nproc.
This consistently broke testing on the arm devbox, where nproc == 96,
even if using low -j values like "10":
```
libgomp: Thread creation failed: Resource temporarily unavailable
```
We can't get libgomp to subscribe to a jobserver. We don't even know if
e.g. steve is running, and cython itself doesn't use GNU Make (which
would make its own jobserver). But we can reasonably assume cython's
already-parallel testsuite will run as much parallelism as needed. We
don't need OpenMP-based over-parallelization, it will always just cause
harm. Disable it entirely.
Signed-off-by: Eli Schwartz <eschwartz <AT> gentoo.org>
dev-python/cython/cython-3.1.7.ebuild | 4 ++++
dev-python/cython/cython-3.1.8.ebuild | 4 ++++
dev-python/cython/cython-3.2.3.ebuild | 6 +++++-
dev-python/cython/cython-3.2.4.ebuild | 4 ++++
4 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/dev-python/cython/cython-3.1.7.ebuild
b/dev-python/cython/cython-3.1.7.ebuild
index 50e541c8414b..5b79d143300b 100644
--- a/dev-python/cython/cython-3.1.7.ebuild
+++ b/dev-python/cython/cython-3.1.7.ebuild
@@ -69,6 +69,10 @@ python_test() {
# Needed to avoid confusing cache tests
unset CYTHON_FORCE_REGEN
+ # uses $(nproc) to additionally parallelize many OpenMP-based jobs,
+ # leading to overcommitting
+ local -x OMP_NUM_THREADS=1
+
tc-export CC
local testargs=(
diff --git a/dev-python/cython/cython-3.1.8.ebuild
b/dev-python/cython/cython-3.1.8.ebuild
index 3874d1e72166..cea99bf41054 100644
--- a/dev-python/cython/cython-3.1.8.ebuild
+++ b/dev-python/cython/cython-3.1.8.ebuild
@@ -69,6 +69,10 @@ python_test() {
# Needed to avoid confusing cache tests
unset CYTHON_FORCE_REGEN
+ # uses $(nproc) to additionally parallelize many OpenMP-based jobs,
+ # leading to overcommitting
+ local -x OMP_NUM_THREADS=1
+
tc-export CC
local testargs=(
diff --git a/dev-python/cython/cython-3.2.3.ebuild
b/dev-python/cython/cython-3.2.3.ebuild
index 23fc59df0adf..1d9399568f5b 100644
--- a/dev-python/cython/cython-3.2.3.ebuild
+++ b/dev-python/cython/cython-3.2.3.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2025 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
@@ -69,6 +69,10 @@ python_test() {
# Needed to avoid confusing cache tests
unset CYTHON_FORCE_REGEN
+ # uses $(nproc) to additionally parallelize many OpenMP-based jobs,
+ # leading to overcommitting
+ local -x OMP_NUM_THREADS=1
+
tc-export CC
local testargs=(
diff --git a/dev-python/cython/cython-3.2.4.ebuild
b/dev-python/cython/cython-3.2.4.ebuild
index f4ac503033bd..1d9399568f5b 100644
--- a/dev-python/cython/cython-3.2.4.ebuild
+++ b/dev-python/cython/cython-3.2.4.ebuild
@@ -69,6 +69,10 @@ python_test() {
# Needed to avoid confusing cache tests
unset CYTHON_FORCE_REGEN
+ # uses $(nproc) to additionally parallelize many OpenMP-based jobs,
+ # leading to overcommitting
+ local -x OMP_NUM_THREADS=1
+
tc-export CC
local testargs=(
