bpo-43592: Raise RLIMIT_NOFILE in test.libregrtest (GH-29127)
Raise RLIMIT_NOFILE in test.libregrtest.
On macOS the default is often too low for our testsuite to succeed.
Co-authored by reviewer: Victor Stinner
(cherry picked from commit 843b890334ca30cf6af27dffe29cecd06b49f7d9)
Co-authored-by: Gregory P. Smith <greg@krypto.org>
diff --git a/Lib/test/libregrtest/setup.py b/Lib/test/libregrtest/setup.py
index 472c6eb..b791759 100644
--- a/Lib/test/libregrtest/setup.py
+++ b/Lib/test/libregrtest/setup.py
@@ -39,6 +39,7 @@ def setup_tests(ns):
for signum in signals:
faulthandler.register(signum, chain=True, file=stderr_fd)
+ _adjust_resource_limits()
replace_stdout()
support.record_original_stdout(sys.stdout)
@@ -134,3 +135,26 @@ def restore_stdout():
sys.stdout.close()
sys.stdout = stdout
atexit.register(restore_stdout)
+
+
+def _adjust_resource_limits():
+ """Adjust the system resource limits (ulimit) if needed."""
+ try:
+ import resource
+ from resource import RLIMIT_NOFILE, RLIM_INFINITY
+ except ImportError:
+ return
+ fd_limit, max_fds = resource.getrlimit(RLIMIT_NOFILE)
+ # On macOS the default fd limit is sometimes too low (256) for our
+ # test suite to succeed. Raise it to something more reasonable.
+ # 1024 is a common Linux default.
+ desired_fds = 1024
+ if fd_limit < desired_fds and fd_limit < max_fds:
+ new_fd_limit = min(desired_fds, max_fds)
+ try:
+ resource.setrlimit(RLIMIT_NOFILE, (new_fd_limit, max_fds))
+ print(f"Raised RLIMIT_NOFILE: {fd_limit} -> {new_fd_limit}")
+ except (ValueError, OSError) as err:
+ print(f"Unable to raise RLIMIT_NOFILE from {fd_limit} to "
+ f"{new_fd_limit}: {err}.")
+