Add guards also for other stress tests.

Author: serhiy-storchaka

Lib/test/test_interpreters/test_stress.py

@@ -16,14 +16,17 @@ class StressTests(TestBase):
     # but not so many that any test takes too long.
 
     @support.requires_resource('cpu')
-    def test_create_many_sequential(self):
+    @support.bigmemtest(size=100, memuse=6.2*2**20, dry_run=False)
+    def test_create_many_sequential(self, size):
         alive = []
-        for _ in range(100):
+        for _ in range(size):
             interp = interpreters.create()
             alive.append(interp)
+        del alive
+        support.gc_collect()
 
     @support.requires_resource('cpu')
-    @support.bigmemtest(size=6.39*2**30, memuse=1, dry_run=False)
+    @support.bigmemtest(size=200, memuse=32*2**20, dry_run=False)
     def test_create_many_threaded(self, size):
         alive = []
         start = threading.Event()
@@ -33,15 +36,17 @@ def task():
                 raise TimeoutError
             interp = interpreters.create()
             alive.append(interp)
-        threads = [threading.Thread(target=task) for _ in range(200)]
+        threads = [threading.Thread(target=task) for _ in range(size)]
         with threading_helper.start_threads(threads):
             start.set()
         del alive
         support.gc_collect()
 
     @support.requires_resource('cpu')
     @threading_helper.requires_working_threading()
-    def test_many_threads_running_interp_in_other_interp(self):
+    @support.bigmemtest(size=200, memuse=32*2**20, dry_run=False)
+    def test_many_threads_running_interp_in_other_interp(self, size):
+        start = threading.Event()
         interp = interpreters.create()
 
         script = f"""if True:
@@ -50,6 +55,9 @@ def test_many_threads_running_interp_in_other_interp(self):
             """
 
         def run():
+            # try to create all interpreters simultaneously
+            if not start.wait(10):
+                raise TimeoutError
             interp = interpreters.create()
             alreadyrunning = (f'{interpreters.InterpreterError}: '
                               'interpreter already running')
@@ -64,9 +72,9 @@ def run():
                 else:
                     success = True
 
-        threads = (threading.Thread(target=run) for _ in range(200))
+        threads = [threading.Thread(target=run) for _ in range(size)]
         with threading_helper.start_threads(threads):
-            pass
+            start.set()
 
 
 if __name__ == '__main__':