[GR-58510] Compilation alarm test: allow delta for time difference.

PullRequest: graal/18908

compiler/src/jdk.graal.compiler.test/src/jdk/graal/compiler/debug/test/CompilationAlarmPhaseTimesTest.java

@@ -73,6 +73,13 @@ protected void run(StructuredGraph graph, LowTierContext context) {
      */
     public static final int SLEEP_SECONDS = 10;
 
+    /**
+     * Thread.sleep is using nanoTime and compilation alarm uses System.currenTimeMillis which is a
+     * different timer so there can be small imprecision. We allow this amount milliseconds total
+     * imprecision.
+     */
+    public static final int IMPRECISION_DELTA = 100;
+
     @Test
     public void testTimeOutRetryToString() {
         // 1D will be multiplied by 2 since we are running with assertions
@@ -94,7 +101,7 @@ public void testTimeOutRetryToString() {
                 duration += c;
                 index++;
             }
-            assert Integer.parseInt(duration) >= 2000 : String.format("Must at least wait for 2000ms but waited %s error was %s", duration, message);
+            assert Integer.parseInt(duration) >= 2000 - IMPRECISION_DELTA : String.format("Must at least wait for 2000ms but waited %s error was %s", duration, message);
         }
     }