Hi, I think there is cultural misunderstanding. In germany, and austria too, dots in numbers are written as comma. Thus it took not 1503 seconds but 1 second and 503 milli seconds. So I think the absolute values are quite okay for writting 2270065 bytes in 1 seconds and 863 milli secnds. My indention mailing the time results, was the question about variation. Thanks, for your eloborated answer. bye ----- Originalnachricht ----- Von: Berin Loritsch <[EMAIL PROTECTED]> Datum: Dienstag, August 14, 2001 10:15 pm Betreff: Re: AW: LogKit - FileRotation > Bernhard Huber wrote: > > > > Hi > > variance of between what? > > Between 1,503 and 1,502 I don't know. > > > > 1)Testcase: testSizeRotationUniqueFilename took 1,503 sec > > 1)Testcase: testSizeRotationRevolingFilename took 1,502 sec > > 2)Testcase: testTimeRotationUniqueFilename took 10,004 sec > > 2)Testcase: testTimeRotationRevolvingFilename took 10,005 sec > > Before we worry about 1 or 2 second variations, I want to take the > time to comment about performance benchmarking. A benchmark is only > useful when it documents consistent trends in your algorithm. It is > not good for absolute numbers, as they have to be normalized in some > way (usually to a reference system). > > Benchmarking results can be affected by the underlying operating > system, as well as the Java Virtual Machine. It could be that you > saw more garbage collection cycles in one test than another, > accountingfor the cumulative second or two. It could be that the > test algorithm > is sufficiently different to consistently add a second to the test > time between the different testcases. Lastly, it could be the > implementation that is the cause of the delay. > > With the numbers we are talking about (1503 and 1502 seconds), it is > only a 0.06% increase in time. The other test (10004 and 10005 sec), > it is only a 0.01% increase in time. Hardly worth spending a lot of > time on it. > > > Between 1,503 and 10,004, and > > between 1,502 and 10,005 is due to writing 10 time more > > data in the later case. > > This satisfactorily accounts for the fact that it takes 6.7 times > longer. > > Just one point, in the revolving case first a unique-filename > > is written, as openFile() is called to early. > > I have not fixed that, yet, perhaps I can do it before the > weekend...> > > I'm doing some more tests as you asked me about variance, > > and now I have following results: > > Testsuite: > org.apache.log.output.test.TestRotatingFileOutputLogTarget> Tests > run: 5, Failures: 0, Errors: 0, Time elapsed: 33,489 sec > > > > ------------- Standard Output --------------- > > File(s) testSizeRotationUniqueFilename.log written: 2270065 > > File(s) testSizeRotationRevolingFilename.log written: 2271565 > > File(s) testTimeRotationUniqueFilename.log written: 15089260 > > File(s) testTimeRotationRevolingFilename.log written: 14864390 > > File(s) testTimeRotationRevolvingFilenameCycles.log written: > 15181155> ------------- ---------------- --------------- > > Testcase: testSizeRotationUniqueFilename took 1,863 sec > > Testcase: testSizeRotationRevolingFilename took 1,602 sec > > Testcase: testTimeRotationUniqueFilename took 10,005 sec > > Testcase: testTimeRotationRevolvingFilename took 10,004 sec > > Testcase: testTimeRotationRevolvingFilenameCycles took 10,005 sec > > > > What's strange the diff between 1,863 and 1,602 > > That's a 16% difference, and categorizes now as significant. Was > anything else running in the background when you ran the test? Was > that result consistent? > > I realize these take a long time to run, but sometimes the tests > are more meaningful in averages (i.e. run 10 or more times with the > results from each run averaged together). > > I also noticed that you have different ammounts of data written in > each test. In order to appropriately test you need to make wither > time constant (run until a set time expires), or the data written > constant (run until the defined set of data is written). > > <snip-the-old-stuff/> > > ------------------------------------------------------------------- > -- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
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