Function adjust_rlimit_nofile

Lib/test/libregrtest/utils.py:568–591

On macOS the default fd limit (RLIMIT_NOFILE) is sometimes too low (256) for our test suite to succeed. Raise it to something more reasonable. 1024 is a common Linux default.

()

def adjust_rlimit_nofile() -> None:
    """
    On macOS the default fd limit (RLIMIT_NOFILE) is sometimes too low (256)
    for our test suite to succeed. Raise it to something more reasonable. 1024
    is a common Linux default.
    """
    try:
        import resource
    except ImportError:
        return

    fd_limit, max_fds = resource.getrlimit(resource.RLIMIT_NOFILE)

    desired_fds = 1024

    if fd_limit < desired_fds and fd_limit < max_fds:
        new_fd_limit = min(desired_fds, max_fds)
        try:
            resource.setrlimit(resource.RLIMIT_NOFILE,
                               (new_fd_limit, max_fds))
            print(f"Raised RLIMIT_NOFILE: {fd_limit} -> {new_fd_limit}")
        except (ValueError, OSError) as err:
            print_warning(f"Unable to raise RLIMIT_NOFILE from {fd_limit} to "
                          f"{new_fd_limit}: {err}.")


def get_host_runner() -> str: