Method test_pre_fork_compile

Lib/test/test_perf_profiler.py:505–578

(self)

            file.unlink()

    def test_pre_fork_compile(self):
        code = """if 1:
                import sys
                import os
                import sysconfig
                from _testinternalcapi import (
                    compile_perf_trampoline_entry,
                    perf_trampoline_set_persist_after_fork,
                )

                def foo_fork():
                    pass

                def bar_fork():
                    foo_fork()

                def foo():
                    import time; time.sleep(1)

                def bar():
                    foo()

                def compile_trampolines_for_all_functions():
                    perf_trampoline_set_persist_after_fork(1)
                    for _, obj in globals().items():
                        if callable(obj) and hasattr(obj, '__code__'):
                            compile_perf_trampoline_entry(obj.__code__)

                if __name__ == "__main__":
                    compile_trampolines_for_all_functions()
                    pid = os.fork()
                    if pid == 0:
                        print(os.getpid())
                        bar_fork()
                    else:
                        bar()
                """

        with temp_dir() as script_dir:
            script = make_script(script_dir, "perftest", code)
            env = {**os.environ, "PYTHON_JIT": "0"}
            with subprocess.Popen(
                [sys.executable, "-Xperf", script],
                universal_newlines=True,
                stderr=subprocess.PIPE,
                stdout=subprocess.PIPE,
                env=env,
            ) as process:
                stdout, stderr = process.communicate()

        self.assertEqual(process.returncode, 0)
        self.assertNotIn("Error:", stderr)
        child_pid = int(stdout.strip())
        perf_file = pathlib.Path(f"/tmp/perf-{process.pid}.map")
        perf_child_file = pathlib.Path(f"/tmp/perf-{child_pid}.map")
        self.assertTrue(perf_file.exists())
        self.assertTrue(perf_child_file.exists())