The Trove collection classes aren't in JDK. Especially the primitive key typed ones. I use them in AOP to avoid memory allocations of primitively-typed keys.
Jon, I would also like somebody to look into concurrency too. Push the limits of JBoss. Scott, Stephan Reich at Apple, and I have done a bit of this over the past 8 months. You guys are doing some cool stuff. Keep it up. Bill > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Bela Ban > Sent: Monday, June 30, 2003 12:48 PM > 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 > > > Jon Barnett wrote: > > > While we've got a few spare cycles, we thought to pursue this whole > > performance thing some more. We grabbed hold of the GNU Trove > collections > > implementation and started converting 3.2.0 source to use these > > collections. So far we have only done it partially in one > strategic area. > > Working off the server branch of the source, we have converted the > > metadata processing, the base proxy factory, and the session > containers to > > using the Trove implementations for HashMap, HashSet and so on. At this > > stage, only on the container classes (Container, > > StatelessSessionContainer, ...) have really been changed to any extent. > > > > Also, we made some basic changes in the source where Lists are > being used > > but the traversals are being performed using the Iterator. It > seemed like > > the poorer memory use by the List was combined with the poorer access > > method of the base collection - according to theory, anyway. It gives a > > solid base level interface but we wondered whether internally, you could > > take advantage of the knowledge the collection was an ArrayList [get(i) > > over hasNext()/next()]. We tried that on the > getChildrenByTagName with an > > implemented getChildArrayByTagName for the metadata. > > > > Boot time did not seem to change substantially - probably with small > > amounts of metadata to read per deployment unit, the performance > > improvement is negligible for the ArrayList versus an Iterator. > > > > We seem to have achieved a 6.5% reduction in the response time > compared to > > the previous best results, with the limited changes we have implemented. > > Compared to the results from > > http://www.amitysolutions.com.au/downloads/JBoss-3.2.0_optimizations.pdf > > for those who haven't browsed it before, we obtained the following > > steady-state values for a 9600 sample on the same optimized JBoss test > > rig, running with IBM SDK 1.4.0 using a new jboss.jar and an optimized > > trove.jar: > > > > response time: 115 ms (down 6.5%) > > max: 3184 ms > > min: 50 ms > > VSZ: 184196 (down 2.96%) > > RSS: 129504 (down 1.61%) > > > > We'll keep playing with this when we have time and see how it goes. > > > > Remember that the improvements will always depend on many factors. With > > Trove, you will probably get on par or minimally small improvements with > > small collections, but if the numbers generated by the Trove benchmarks > > are anything to go by, large collections will get a sizeable performance > > boost from Trove. > > > > JonB > > > -- > 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 ------------------------------------------------------- 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
