Object creation kills you. In any language.... > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Bela Ban > Sent: Monday, June 30, 2003 2:34 PM > To: [EMAIL PROTECTED] > Subject: Re: [JBoss-user] On the performance trail - again > > > Jon, > > do you have any numbers on this ? E.g. Sun's collection classes against > Trove ? > > Performance is a moving target; ie. in one release of the VM, object > creation kills you, and in the next it is gone (JDK 1.4). Or try-catch > is bad, then in 1.4. the overhead is gone too. > > Question is: should we bank on Trove for keeping up-to-date with a > moving target (moved by Sun), or should we trust Sun to do the right job ? > > But anyways, your measurements are very useful, and I would be > interested in seeing all numbers. > > I'm thinking of moving all my custom built data structures over to JDK > collections, in support of my previous argument. But of course I'd > reconsider if you can show mediocre performance in the native > coll classes. > Regards, > > > Jon Barnett wrote: > > > Good question. I'm not saying that standard JBoss should > include them. I'm > > just investigating the impact. > > > > Now the GNU projects have always been high quality, and the > Trove package > > seems to have reached a certain level of maturity so I feel that I can > > play with the intermix just to see what happens. I'm also getting deep > > into the JBoss code just to understand the structure so that can only be > > good. > > > > I can't definitely say that this will lead to anything - the > interactions > > are so complex with J2EE systems that things may cancel themselves out. > > But you won't know until you try and without measurements > things are more > > speculation than certainty. I have stabilised some of the memory usage I > > think, in 3.2.0 with the metadata processing by making internal > use of the > > existing ArrayLists and trimToSize() - performance and memory > consumption > > seems less spikey (without resorting to the Trove classes). > Haven't done a > > thorough test as yet. > > > > The Sun implementations are safe, but without healthy competition, they > > probably wouldn't push the boundaries. The memory usage and > speed in their > > collections are not optimal and without a comparison implementation it's > > hard to say how good the Sun release will be. And from testing, > their JDK > > performance in most respects seems below par compared with > other vendors. > > All I'm doing is testing the boundaries with JBoss - it's fast, but I'm > > just curious at how fast it can go, how smooth the delivery is and what > > might hold it back. > > > > I've done a quick test under Windows and the Sun JDK (a run of 3000 > > samples) - the changes so far including some Trove insertions > (again only > > in parts of the server branch of code) have dropped the steady state > > average response times from 44 ms to 36 ms and the JMeter graphs show a > > nearly continuous line at 20 ms with upward deviations dragging the > > average up. That is an improvement of 15% ~ 18% and with only a > couple of > > days tinkering. > > > > What does it mean? I'm not sure - do we want faster JVMs? Are we happy > > with choppy response? Are there problems in the code? Is it a > problem with > > the JVM? Brighter minds must think on this. I'm only making > observations. > > ;) > > > > JonB > > > >> -----Original Message----- > >> From: [EMAIL PROTECTED] > >> [mailto:[EMAIL PROTECTED] Behalf Of Bela Ban > >> Sent: Tuesday, 1 July 2003 2:48 AM > >> To: [EMAIL PROTECTED] > >> Subject: Re: [JBoss-user] On the performance trail - again > >> > >> > >> Hi Jon, > >> > >> I haven't played with Trove yet, so bear with me. > >> > >> My question is, is it wise to use the Trove collection classes when you > >> have them in the JDK already ? Also, in Tiger (JDK 1.5) we will have > >> collection classes that are further optimized and suited for > >> high-performance reentrant use (java.util.concurrent). Essentially Doug > >> Lea's concurrent.util as native JDK. > >> > >> Bela > > > > -- > Bela Ban > http://www.javagroups.com > Cell: (408) 316-4459 > > > > ------------------------------------------------------- > This SF.Net email sponsored by: Free pre-built ASP.NET sites including > Data Reports, E-commerce, Portals, and Forums are available now. > Download today and enter to win an XBOX or Visual Studio .NET. > http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 > _______________________________________________ > JBoss-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/jboss-user
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