From 5a23716c4f10700e9378f66702cd6797475ec30e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 17 Oct 2025 12:01:43 +0900
Subject: Skip low precision clocks to measure performances

---
 tool/lib/core_assertions.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tool/lib/core_assertions.rb b/tool/lib/core_assertions.rb
index 7e6dc8e653..1288b8c9aa 100644
--- a/tool/lib/core_assertions.rb
+++ b/tool/lib/core_assertions.rb
@@ -838,6 +838,9 @@ eom
             rescue
               # Constants may be defined but not implemented, e.g., mingw.
             else
+              unless Process.clock_getres(clk) < 1.0e-03
+                next # needs msec precision
+              end
               PERFORMANCE_CLOCK = clk
             end
           end
-- 
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