When running a 'mvn package' from the top level of the logback project, I'm getting intermittent failure on durationOfDisabledLog_NoParameters in LoggerPerfTest. My computer is quite fast (i7 2600K, 8GB, linux 3.0.4, jdk 1.6u27) When I run the test by itself from my IDE, it passes with the following output: durationOfDisabledLog_NoParameters=2.0 Host runs at 96906.22045874437 BIPS currentBIPS=84956.35367330034 BIPS The test also succeeds when I run mvn with -Dtest=LoggerPerfTest -DfailIfNoTests=false. Contents of the surefire report from one such failure: ------------------------------------------------------------------------------- Test set: ch.qos.logback.classic.LoggerPerfTest ------------------------------------------------------------------------------- Tests run: 6, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 1.589 sec <<< FAILURE! durationOfDisabledLogsWith_1_NOPFilter(ch.qos.logback.classic.LoggerPerfTest) Time elapsed: 0.026 sec durationOfIsDebugEnabled(ch.qos.logback.classic.LoggerPerfTest) Time elapsed: 0.1 sec durationOfDisabledLog_NoParameters(ch.qos.logback.classic.LoggerPerfTest) Time elapsed: 0.19 sec <<< FAILURE! junit.framework.AssertionFailedError: current duration 6.0 exceeded expected 1.8218115000000001 (adjusted reference), 18 (raw reference) at org.slf4j.helpers.BogoPerf.assertDuration(BogoPerf.java:121) at ch.qos.logback.classic.LoggerPerfTest.durationOfDisabledLog_NoParameters(LoggerPerfTest.java:101) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:59) at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:120) at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:103) at org.apache.maven.surefire.Surefire.run(Surefire.java:169) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350) at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021) durationOfDisabledLog_1_Parameter(ch.qos.logback.classic.LoggerPerfTest) Time elapsed: 0.017 sec durationOfEnabledLog(ch.qos.logback.classic.LoggerPerfTest) Time elapsed: 0 sec testThreadedLogging(ch.qos.logback.classic.LoggerPerfTest) Time elapsed: 1.254 sec