gh-109566, regrtest: Add --fast-ci and --slow-ci options (#109570)

* Add --fast-ci and --slow-ci options to libregrtest:

  * --fast-ci uses a default timeout of 10 minutes and "-u all,-cpu"
    (skip slowest tests).
  * --slow-ci uses a default timeout of 20 minues and "-u all" (run
    all tests).

* regrtest header now lists test resources.
* Makefile changes:

  * "make test", "make hostrunnertest" and "make coverage-report" now
    use --fast-ci option and TESTTIMEOUT variable.
  * "make buildbottest" now uses "--slow-ci". Remove options which
    became redundant with "--slow-ci".
  * "make testall" and "make testuniversal" now use --slow-ci option
    and TESTTIMEOUT variable.
  * "make testall" now uses "find -exec rm ..." instead of
    "find ... -print|xargs rm ...", same as "make clean".

* GitHub Actions workflow:

  * Ubuntu and Address Sanitizer jobs now use "make test". Remove
    options which became redundant with "--fast-ci".
  * Windows jobs now use --fast-ci option.
  * Use -j0 to detect the number of CPUs.

* Set Makefile TESTTIMEOUT default to an empty string, since
  --slow-ci and --fast-ci use different default timeout. It's now
  accepted to pass "--timeout=" to regrtest: treated as not timeout.
* Tools/scripts/run_tests.py now uses --fast-ci option.
* Tools/buildbot/test.bat now uses --slow-ci option. Remove
  --timeout=1200 option, redundant with --slow-ci.

11 files changed, 161 insertions, 51 deletions

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7f9d0f4da09..28ebc1643bd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -182,7 +182,7 @@ jobs:
     - name: Display build info
       run: .\python.bat -m test.pythoninfo
     - name: Tests
-      run: .\PCbuild\rt.bat -p Win32 -d -q -uall -u-cpu -rwW --slowest --timeout=1200 -j0
+      run: .\PCbuild\rt.bat -p Win32 -d -q --fast-ci
 
   build_win_amd64:
     name: 'Windows (x64)'
@@ -201,7 +201,7 @@ jobs:
     - name: Display build info
       run: .\python.bat -m test.pythoninfo
     - name: Tests
-      run: .\PCbuild\rt.bat -p x64 -d -q -uall -u-cpu -rwW --slowest --timeout=1200 -j0
+      run: .\PCbuild\rt.bat -p x64 -d -q --fast-ci
 
   build_win_arm64:
     name: 'Windows (arm64)'
@@ -252,7 +252,7 @@ jobs:
     - name: Display build info
       run: make pythoninfo
     - name: Tests
-      run: make buildbottest TESTOPTS="-j4 -uall,-cpu"
+      run: make test
 
   build_ubuntu:
     name: 'Ubuntu'
@@ -319,7 +319,7 @@ jobs:
       run: sudo mount $CPYTHON_RO_SRCDIR -oremount,rw
     - name: Tests
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
-      run: xvfb-run make buildbottest TESTOPTS="-j4 -uall,-cpu"
+      run: xvfb-run make test
 
   build_ubuntu_ssltests:
     name: 'Ubuntu SSL tests with OpenSSL'
@@ -535,7 +535,7 @@ jobs:
     - name: Display build info
       run: make pythoninfo
     - name: Tests
-      run: xvfb-run make buildbottest TESTOPTS="-j4 -uall,-cpu"
+      run: xvfb-run make test
 
   all-required-green:  # This job does nothing and is only used for the branch protection
     name: All required checks pass
diff --git a/Doc/using/configure.rst b/Doc/using/configure.rst
index 763f9778776..82074750ec5 100644
--- a/Doc/using/configure.rst
+++ b/Doc/using/configure.rst
@@ -964,9 +964,18 @@ Main Makefile targets
   You can use the configure :option:`--enable-optimizations` option to make
   this the default target of the ``make`` command (``make all`` or just
   ``make``).
-* ``make buildbottest``: Build Python and run the Python test suite, the same
-  way than buildbots test Python. Set ``TESTTIMEOUT`` variable (in seconds)
-  to change the test timeout (1200 by default: 20 minutes).
+
+* ``make test``: Build Python and run the Python test suite with ``--slow-ci``
+  option. Variables:
+
+  * ``TESTOPTS``: additional regrtest command line options.
+  * ``TESTPYTHONOPTS``: additional Python command line options.
+  * ``TESTTIMEOUT``: timeout in seconds (default: 20 minutes).
+
+* ``make buildbottest``: Similar to ``make test``, but use ``--slow-ci``
+  option and default timeout of 20 minutes, instead of ``--fast-ci`` option
+  and a default timeout of 10 minutes.
+
 * ``make install``: Build and install Python.
 * ``make regen-all``: Regenerate (almost) all generated files;
   ``make regen-stdlib-module-names`` and ``autoconf`` must be run separately
diff --git a/Lib/test/libregrtest/cmdline.py b/Lib/test/libregrtest/cmdline.py
index 99f28152f1a..a0a8504fe8f 100644
--- a/Lib/test/libregrtest/cmdline.py
+++ b/Lib/test/libregrtest/cmdline.py
@@ -4,6 +4,8 @@ import shlex
 import sys
 from test.support import os_helper
 
+from .utils import MS_WINDOWS
+
 
 USAGE = """\
 python -m test [options] [test_name1 [test_name2 ...]]
@@ -145,6 +147,7 @@ RESOURCE_NAMES = ALL_RESOURCES + ('extralargefile', 'tzdata')
 
 class Namespace(argparse.Namespace):
     def __init__(self, **kwargs) -> None:
+        self.ci = False
         self.testdir = None
         self.verbose = 0
         self.quiet = False
@@ -209,7 +212,13 @@ def _create_parser():
     # We add help explicitly to control what argument group it renders under.
     group.add_argument('-h', '--help', action='help',
                        help='show this help message and exit')
-    group.add_argument('--timeout', metavar='TIMEOUT', type=float,
+    group.add_argument('--fast-ci', action='store_true',
+                       help='Fast Continuous Integration (CI) mode used by '
+                            'GitHub Actions')
+    group.add_argument('--slow-ci', action='store_true',
+                       help='Slow Continuous Integration (CI) mode used by '
+                            'buildbot workers')
+    group.add_argument('--timeout', metavar='TIMEOUT',
                         help='dump the traceback and exit if a test takes '
                              'more than TIMEOUT seconds; disabled if TIMEOUT '
                              'is negative or equals to zero')
@@ -384,7 +393,49 @@ def _parse_args(args, **kwargs):
     for arg in ns.args:
         if arg.startswith('-'):
             parser.error("unrecognized arguments: %s" % arg)
-            sys.exit(1)
+
+    if ns.timeout is not None:
+        # Support "--timeout=" (no value) so Makefile.pre.pre TESTTIMEOUT
+        # can be used by "make buildbottest" and "make test".
+        if ns.timeout != "":
+            try:
+                ns.timeout = float(ns.timeout)
+            except ValueError:
+                parser.error(f"invalid timeout value: {ns.timeout!r}")
+        else:
+            ns.timeout = None
+
+    # Continuous Integration (CI): common options for fast/slow CI modes
+    if ns.slow_ci or ns.fast_ci:
+        # Similar to options:
+        #
+        #     -j0 --randomize --fail-env-changed --fail-rerun --rerun
+        #     --slowest --verbose3 --nowindows
+        if ns.use_mp is None:
+            ns.use_mp = 0
+        ns.randomize = True
+        ns.fail_env_changed = True
+        ns.fail_rerun = True
+        ns.rerun = True
+        ns.print_slow = True
+        ns.verbose3 = True
+        if MS_WINDOWS:
+            ns.nowindows = True  # Silence alerts under Windows
+
+    # When both --slow-ci and --fast-ci options are present,
+    # --slow-ci has the priority
+    if ns.slow_ci:
+        # Similar to: -u "all" --timeout=1200
+        if not ns.use:
+            ns.use = [['all']]
+        if ns.timeout is None:
+            ns.timeout = 1200  # 20 minutes
+    elif ns.fast_ci:
+        # Similar to: -u "all,-cpu" --timeout=600
+        if not ns.use:
+            ns.use = [['all', '-cpu']]
+        if ns.timeout is None:
+            ns.timeout = 600  # 10 minutes
 
     if ns.single and ns.fromfile:
         parser.error("-s and -f don't go together!")
diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 0ec25a06b6e..2cd79a1eae5 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -425,7 +425,7 @@ class Regrtest:
         if (self.want_header
             or not(self.pgo or self.quiet or self.single_test_run
                    or tests or self.cmdline_args)):
-            display_header()
+            display_header(self.use_resources)
 
         if self.randomize:
             print("Using random seed", self.random_seed)
diff --git a/Lib/test/libregrtest/results.py b/Lib/test/libregrtest/results.py
index 1a8619fb62b..35df50d581f 100644
--- a/Lib/test/libregrtest/results.py
+++ b/Lib/test/libregrtest/results.py
@@ -8,11 +8,13 @@ from .utils import (
     printlist, count, format_duration)
 
 
+# Python uses exit code 1 when an exception is not catched
+# argparse.ArgumentParser.error() uses exit code 2
 EXITCODE_BAD_TEST = 2
 EXITCODE_ENV_CHANGED = 3
 EXITCODE_NO_TESTS_RAN = 4
 EXITCODE_RERUN_FAIL = 5
-EXITCODE_INTERRUPTED = 130
+EXITCODE_INTERRUPTED = 130   # 128 + signal.SIGINT=2
 
 
 class TestResults:
diff --git a/Lib/test/libregrtest/utils.py b/Lib/test/libregrtest/utils.py
index 6af949cea9c..f3f0eb53b32 100644
--- a/Lib/test/libregrtest/utils.py
+++ b/Lib/test/libregrtest/utils.py
@@ -547,7 +547,7 @@ def adjust_rlimit_nofile():
                           f"{new_fd_limit}: {err}.")
 
 
-def display_header():
+def display_header(use_resources: tuple[str, ...]):
     encoding = sys.stdout.encoding
 
     # Print basic platform information
@@ -569,6 +569,13 @@ def display_header():
     print("== encodings: locale=%s, FS=%s"
           % (locale.getencoding(), sys.getfilesystemencoding()))
 
+
+    if use_resources:
+        print(f"== resources ({len(use_resources)}): "
+              f"{', '.join(sorted(use_resources))}")
+    else:
+        print(f"== resources: (all disabled, use -u option)")
+
     # This makes it easier to remember what to set in your local
     # environment when trying to reproduce a sanitizer failure.
     asan = support.check_sanitizer(address=True)
diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
index 4b819cbbb8d..15aab609ed1 100644
--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -23,8 +23,9 @@ import unittest
 from test import support
 from test.support import os_helper, TestStats, without_optimizer
 from test.libregrtest import cmdline
-from test.libregrtest import utils
+from test.libregrtest import main
 from test.libregrtest import setup
+from test.libregrtest import utils
 from test.libregrtest.utils import normalize_test_name
 
 if not support.has_subprocess_support:
@@ -75,8 +76,15 @@ class ParseArgsTestCase(unittest.TestCase):
     def test_timeout(self):
         ns = self.parse_args(['--timeout', '4.2'])
         self.assertEqual(ns.timeout, 4.2)
+
+        # negative, zero and empty string are treated as "no timeout"
+        for value in ('-1', '0', ''):
+            with self.subTest(value=value):
+                ns = self.parse_args([f'--timeout={value}'])
+                self.assertEqual(ns.timeout, None)
+
         self.checkError(['--timeout'], 'expected one argument')
-        self.checkError(['--timeout', 'foo'], 'invalid float value')
+        self.checkError(['--timeout', 'foo'], 'invalid timeout value:')
 
     def test_wait(self):
         ns = self.parse_args(['--wait'])
@@ -366,6 +374,44 @@ class ParseArgsTestCase(unittest.TestCase):
         self.checkError(['--unknown-option'],
                         'unrecognized arguments: --unknown-option')
 
+    def check_ci_mode(self, args, use_resources):
+        ns = cmdline._parse_args(args)
+        if utils.MS_WINDOWS:
+            self.assertTrue(ns.nowindows)
+
+        # Check Regrtest attributes which are more reliable than Namespace
+        # which has an unclear API
+        regrtest = main.Regrtest(ns)
+        self.assertNotEqual(regrtest.num_workers, 0)
+        self.assertTrue(regrtest.want_rerun)
+        self.assertTrue(regrtest.randomize)
+        self.assertIsNone(regrtest.random_seed)
+        self.assertTrue(regrtest.fail_env_changed)
+        self.assertTrue(regrtest.fail_rerun)
+        self.assertTrue(regrtest.print_slowest)
+        self.assertTrue(regrtest.output_on_failure)
+        self.assertEqual(sorted(regrtest.use_resources), sorted(use_resources))
+        return regrtest
+
+    def test_fast_ci(self):
+        args = ['--fast-ci']
+        use_resources = sorted(cmdline.ALL_RESOURCES)
+        use_resources.remove('cpu')
+        regrtest = self.check_ci_mode(args, use_resources)
+        self.assertEqual(regrtest.timeout, 10 * 60)
+
+    def test_fast_ci_resource(self):
+        # it should be possible to override resources
+        args = ['--fast-ci', '-u', 'network']
+        use_resources = ['network']
+        self.check_ci_mode(args, use_resources)
+
+    def test_slow_ci(self):
+        args = ['--slow-ci']
+        use_resources = sorted(cmdline.ALL_RESOURCES)
+        regrtest = self.check_ci_mode(args, use_resources)
+        self.assertEqual(regrtest.timeout, 20 * 60)
+
 
 @dataclasses.dataclass(slots=True)
 class Rerun:
diff --git a/Makefile.pre.in b/Makefile.pre.in
index d123fa3e6f4..ccbacfc8571 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -771,7 +771,7 @@ coverage-report: regen-token regen-frozen
 	@ # build with coverage info
 	$(MAKE) coverage
 	@ # run tests, ignore failures
-	$(TESTRUNNER) $(TESTOPTS) || true
+	$(TESTRUNNER) --fast-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS) || true
 	@ # build lcov report
 	$(MAKE) coverage-lcov
 
@@ -1844,7 +1844,7 @@ $(LIBRARY_OBJS) $(MODOBJS) Programs/python.o: $(PYTHON_HEADERS)
 TESTOPTS=	$(EXTRATESTOPTS)
 TESTPYTHON=	$(RUNSHARED) $(PYTHON_FOR_BUILD) $(TESTPYTHONOPTS)
 TESTRUNNER=	$(TESTPYTHON) $(srcdir)/Tools/scripts/run_tests.py
-TESTTIMEOUT=	1200
+TESTTIMEOUT=
 
 # Remove "test_python_*" directories of previous failed test jobs.
 # Pass TESTOPTS options because it can contain --tempdir option.
@@ -1854,9 +1854,10 @@ cleantest: all
 
 # Run a basic set of regression tests.
 # This excludes some tests that are particularly resource-intensive.
+# Similar to buildbottest, but use --fast-ci option, instead of --slow-ci.
 .PHONY: test
 test: all
-		$(TESTRUNNER) $(TESTOPTS)
+	$(TESTRUNNER) --fast-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS)
 
 # Run the full test suite twice - once without .pyc files, and once with.
 # In the past, we've had problems where bugs in the marshalling or
@@ -1867,43 +1868,43 @@ test: all
 # sample data.
 .PHONY: testall
 testall: all
-		-find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
-		$(TESTPYTHON) -E $(srcdir)/Lib/compileall.py
-		-find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
-		-$(TESTRUNNER) -u all $(TESTOPTS)
-		$(TESTRUNNER) -u all $(TESTOPTS)
+	-find $(srcdir)/Lib -name '*.py[co]' -exec rm -f {} ';' || true
+	$(TESTPYTHON) -E $(srcdir)/Lib/compileall.py
+	-find $(srcdir)/Lib -name '*.py[co]' -exec rm -f {} ';' || true
+	$(TESTRUNNER) --slow-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS)
+	$(TESTRUNNER) --slow-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS)
 
 # Run the test suite for both architectures in a Universal build on OSX.
 # Must be run on an Intel box.
 .PHONY: testuniversal
 testuniversal: all
-		@if [ `arch` != 'i386' ]; then \
-			echo "This can only be used on OSX/i386" ;\
-			exit 1 ;\
-		fi
-		$(TESTRUNNER) -u all $(TESTOPTS)
-		$(RUNSHARED) /usr/libexec/oah/translate \
-			./$(BUILDPYTHON) -E -m test -j 0 -u all $(TESTOPTS)
+	@if [ `arch` != 'i386' ]; then \
+		echo "This can only be used on OSX/i386" ;\
+		exit 1 ;\
+	fi
+	$(TESTRUNNER) --slow-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS)
+	$(RUNSHARED) /usr/libexec/oah/translate \
+		./$(BUILDPYTHON) -E -m test -j 0 -u all $(TESTOPTS)
 
 # Like testall, but with only one pass and without multiple processes.
 # Run an optional script to include information about the build environment.
 .PHONY: buildbottest
 buildbottest: all
-		-@if which pybuildbot.identify >/dev/null 2>&1; then \
-			pybuildbot.identify "CC='$(CC)'" "CXX='$(CXX)'"; \
-		fi
-		$(TESTRUNNER) -j 1 -u all -W --slowest --fail-env-changed --fail-rerun --timeout=$(TESTTIMEOUT) $(TESTOPTS)
+	-@if which pybuildbot.identify >/dev/null 2>&1; then \
+		pybuildbot.identify "CC='$(CC)'" "CXX='$(CXX)'"; \
+	fi
+	$(TESTRUNNER) --slow-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS)
 
 # Like testall, but run Python tests with HOSTRUNNER directly.
 .PHONY: hostrunnertest
 hostrunnertest: all
-	$(RUNSHARED) $(HOSTRUNNER) ./$(BUILDPYTHON) -m test -u all $(TESTOPTS)
+	$(RUNSHARED) $(HOSTRUNNER) ./$(BUILDPYTHON) -m test --slow-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS)
 
 .PHONY: pythoninfo
 pythoninfo: all
 		$(RUNSHARED) $(HOSTRUNNER) ./$(BUILDPYTHON) -m test.pythoninfo
 
-QUICKTESTOPTS=	$(TESTOPTS) -x test_subprocess test_io \
+QUICKTESTOPTS=	-x test_subprocess test_io \
 		test_multibytecodec test_urllib2_localnet test_itertools \
 		test_multiprocessing_fork test_multiprocessing_spawn \
 		test_multiprocessing_forkserver \
@@ -1912,7 +1913,7 @@ QUICKTESTOPTS=	$(TESTOPTS) -x test_subprocess test_io \
 
 .PHONY: quicktest
 quicktest: all
-		$(TESTRUNNER) $(QUICKTESTOPTS)
+	$(TESTRUNNER) --fast-ci --timeout=$(TESTTIMEOUT) $(TESTOPTS) $(QUICKTESTOPTS)
 
 # SSL tests
 .PHONY: multisslcompile
diff --git a/Misc/NEWS.d/next/Tests/2023-09-19-13-33-20.gh-issue-109566.aX0g9o.rst b/Misc/NEWS.d/next/Tests/2023-09-19-13-33-20.gh-issue-109566.aX0g9o.rst
new file mode 100644
index 00000000000..10f90132c37
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2023-09-19-13-33-20.gh-issue-109566.aX0g9o.rst
@@ -0,0 +1,4 @@
+regrtest: Add ``--fast-ci`` and ``--slow-ci`` options. ``--fast-ci`` uses a
+default timeout of 10 minutes and ``-u all,-cpu`` (skip slowest tests).
+``--slow-ci`` uses a default timeout of 20 minues and ``-u all`` (run all
+tests). Patch by Victor Stinner.
diff --git a/Tools/buildbot/test.bat b/Tools/buildbot/test.bat
index c1b2605a4b2..781f9a4c820 100644
--- a/Tools/buildbot/test.bat
+++ b/Tools/buildbot/test.bat
@@ -5,7 +5,7 @@ setlocal
 set PATH=%PATH%;%SystemRoot%\SysNative\OpenSSH;%SystemRoot%\System32\OpenSSH
 set here=%~dp0
 set rt_opts=-q -d
-set regrtest_args=-j1
+set regrtest_args=
 set arm32_ssh=
 
 :CheckOpts
@@ -23,7 +23,7 @@ if "%PROCESSOR_ARCHITECTURE%"=="ARM" if "%arm32_ssh%"=="true" goto NativeExecuti
 if "%arm32_ssh%"=="true" goto :Arm32Ssh
 
 :NativeExecution
-call "%here%..\..\PCbuild\rt.bat" %rt_opts% -uall -rwW --slowest --timeout=1200 %regrtest_args%
+call "%here%..\..\PCbuild\rt.bat" %rt_opts% --slow-ci %regrtest_args%
 exit /b %ERRORLEVEL%
 
 :Arm32Ssh
@@ -35,7 +35,7 @@ if NOT "%REMOTE_PYTHON_DIR:~-1,1%"=="\" (set REMOTE_PYTHON_DIR=%REMOTE_PYTHON_DI
 
 set TEMP_ARGS=--temp %REMOTE_PYTHON_DIR%temp
 
-set rt_args=%rt_opts% %dashU% -rwW --slowest --timeout=1200 %regrtest_args% %TEMP_ARGS%
+set rt_args=%rt_opts% --slow-ci %dashU% %regrtest_args% %TEMP_ARGS%
 ssh %SSH_SERVER% "set TEMP=%REMOTE_PYTHON_DIR%temp& cd %REMOTE_PYTHON_DIR% & %REMOTE_PYTHON_DIR%PCbuild\rt.bat" %rt_args%
 set ERR=%ERRORLEVEL%
 scp %SSH_SERVER%:"%REMOTE_PYTHON_DIR%test-results.xml" "%PYTHON_SOURCE%\test-results.xml"
diff --git a/Tools/scripts/run_tests.py b/Tools/scripts/run_tests.py
index 445a34ae3e8..c62ae82dd78 100644
--- a/Tools/scripts/run_tests.py
+++ b/Tools/scripts/run_tests.py
@@ -18,9 +18,6 @@ def is_multiprocess_flag(arg):
     return arg.startswith('-j') or arg.startswith('--multiprocess')
 
 
-def is_resource_use_flag(arg):
-    return arg.startswith('-u') or arg.startswith('--use')
-
 def is_python_flag(arg):
     return arg.startswith('-p') or arg.startswith('--python')
 
@@ -56,20 +53,13 @@ def main(regrtest_args):
     args.extend(test.support.args_from_interpreter_flags())
 
     args.extend(['-m', 'test',    # Run the test suite
-                 '-r',            # Randomize test order
-                 '-w',            # Re-run failed tests in verbose mode
+                 '--fast-ci',     # Fast Continuous Integration mode
                  ])
-    if sys.platform == 'win32':
-        args.append('-n')         # Silence alerts under Windows
     if not any(is_multiprocess_flag(arg) for arg in regrtest_args):
         if cross_compile and hostrunner:
             # For now use only two cores for cross-compiled builds;
             # hostrunner can be expensive.
             args.extend(['-j', '2'])
-        else:
-            args.extend(['-j', '0'])  # Use all CPU cores
-    if not any(is_resource_use_flag(arg) for arg in regrtest_args):
-        args.extend(['-u', 'all,-largefile,-audio,-gui'])
 
     if cross_compile and hostrunner:
         # If HOSTRUNNER is set and -p/--python option is not given, then