On Sun, Aug 21, 2005 at 03:08:33PM +0200, Oleg Kalnichevski wrote: > I have also compiled another bunch of test cases intended to test > performance of various read operations. Interestingly enough, but not > entirely unexpectedly, NIO handsomely outperforms classic IO when > reading single bytes and lines of text: > > ============================== > Old IO byte array read average time (ms): 246 > NIO byte array read average time (ms): 216 > Old IO one byte read average time (ms): 537 > NIO one byte read average time (ms): 178 > Old IO one line read average time (ms): 340 > NIO one line read average time (ms): 77 > ============================== > Source [2] >
What a bloody mess. I ran the test on my WinXP box at work and this is what I got: Java 1.4.2.3 ============================================== Old IO byte array read average time (ms): 1031 NIO byte array read average time (ms): 1094 Old IO one byte read average time (ms): 281 NIO one byte read average time (ms): 296 Old IO one line read average time (ms): 157 NIO one line read average time (ms): 157 Java 1.5.0.3 ============================================= Old IO byte array read average time (ms): 955 NIO byte array read average time (ms): 1017 Old IO one byte read average time (ms): 250 NIO one byte read average time (ms): 281 Old IO one line read average time (ms): 141 NIO one line read average time (ms): 125 Classic IO seems to outperform NIO on Windows, whereas the same test run on my Linux box produced the opposite result Anyone observing the same phenomenon? Oleg > Please let me know if you can spot any flaws in the test cases > > Cheers, > > Oleg > > [1] > http://svn.apache.org/repos/asf/jakarta/httpclient/trunk/http-common/src/test/tests/performance/RawNIOvsRawOIOTest.java > [2] > http://svn.apache.org/repos/asf/jakarta/httpclient/trunk/http-common/src/test/tests/performance/HttpNIOvsHttpOIOTest.java > > On Sat, 2005-08-20 at 22:01 +0200, Oleg Kalnichevski wrote: > > Folks, > > > > I have just identified another problem with HttpCommon code, which > > causes massive performance degradation when streaming in or out chunked > > data. I also suspect HttpDataReceiver and HttpDataTransmitter interfaces > > will have to be completely rethought. Since it is very rainy and cold > > here, and the weekend looks all but ruined, I guess this is just the > > perfect opportunity to get some code fixed ;-) > > > > Oleg > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
