From be949bbfa64912e2fb80132335c6654594a6032b Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Mon, 29 Apr 2024 17:25:20 +0200
Subject: [PATCH] gh-88494: Reduce CLOCK_RES to 1 ms in tests

On Windows, time.monotonic() now calls QueryPerformanceCounter()
which has a resolution of 100 ns. Reduce CLOCK_RES from 50 or 100 ms
to 1 ms.
---
 Lib/test/_test_multiprocessing.py | 4 ++--
 Lib/test/test_asyncio/utils.py    | 6 ++----
 Lib/test/test_capi/test_time.py   | 2 +-
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
index a74b61013c4848..9bf30b2cdc9bef 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -84,9 +84,9 @@
     raise unittest.SkipTest("libasan has a pthread_create() dead lock related to thread+fork")
 
 
-# gh-110666: Tolerate a difference of 100 ms when comparing timings
+# gh-110666: Tolerate a difference of 1 ms when comparing timings
 # (clock resolution)
-CLOCK_RES = 0.100
+CLOCK_RES = 0.001
 
 
 def latin(s):
diff --git a/Lib/test/test_asyncio/utils.py b/Lib/test/test_asyncio/utils.py
index 44943e1fa7bc4e..c59b27bc6c5780 100644
--- a/Lib/test/test_asyncio/utils.py
+++ b/Lib/test/test_asyncio/utils.py
@@ -36,10 +36,8 @@
 from test.support import threading_helper
 
 
-# Use the maximum known clock resolution (gh-75191, gh-110088): Windows
-# GetTickCount64() has a resolution of 15.6 ms. Use 50 ms to tolerate rounding
-# issues.
-CLOCK_RES = 0.050
+# Tolerate 1 ms difference when comparing timings.
+CLOCK_RES = 0.001
 
 
 def data_file(*filename):
diff --git a/Lib/test/test_capi/test_time.py b/Lib/test/test_capi/test_time.py
index 10b7fbf2c372a3..99aac461d1221d 100644
--- a/Lib/test/test_capi/test_time.py
+++ b/Lib/test/test_capi/test_time.py
@@ -9,7 +9,7 @@
 SEC_TO_NS = 10 ** 9
 DAY_TO_SEC = (24 * 60 * 60)
 # Worst clock resolution: maximum delta between two clock reads.
-CLOCK_RES = 0.050
+CLOCK_RES = 0.001
 
 
 class CAPITest(unittest.TestCase):