RE: Sun JDK 1.4 production quality?
Hi, We actually have several webapps (on separate tomcat instances) with very different data models and corresponding GC behaviors. For example, we have one webapp which actually doesn't get that much user traffic, but needs to have a lot of information cached in memory for very quick retrieval once those few users ask for it. So its old generation is about 80% of the heap. We found ConcMarkSweepGC on the old generation and parallel GC on the new generation to be very good here: JAVA_OPTS='-server -Xmx1024m -Xms768m -XX:NewSize=100m -XX:MaxNewSize=200m -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseParNewGC' But as I've mentioned many times before: these settings are very application-specific. I don't know of any way, other than experimentation and tuning with your own app, of finding the right settings for you ;) Yoav Shapira Millennium ChemInformatics -Original Message- From: Nick Wesselman [mailto:[EMAIL PROTECTED]] Sent: Friday, November 22, 2002 4:28 PM To: Tomcat Users List Subject: Re: Sun JDK 1.4 production quality? On Friday, November 22, 2002, at 11:33 AM, Shapira, Yoav wrote: GC has markedly improved, although we did have to experiment a bit with the new GC options. What conclusions did you come to? My understanding is that ConcMarkSweepGC might be helpful for Tomcat, since you could avoid the problem of the OS gathering too many network connections for Tomcat while it's garbage collecting. Nick -- To unsubscribe, e-mail: mailto:tomcat-user- [EMAIL PROTECTED] For additional commands, e-mail: mailto:tomcat-user- [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Sun JDK 1.4 production quality?
I have heard a number of differing opinions about the stability of 1.4.x version of Sun's JDK. I wanted to see if anyone runs Tomcat using 1.4.x and how they have found its stability, speed, etc. I know there have been a number of enhancements in 1.4 which sound intriguing; additionally, its jdbc driver fixes a bug that is curretnly vexing us. Our Tomcat installation gets roughly 25,000 hits a day; if you can include an approximate idea of how many hits your app takes, this information would be helpful. I would, of course, test this with load testing, but the management here seems to think we do not need it*sigh* Thanks, Ben Ricker -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Sun JDK 1.4 production quality?
Hi, It's good. Stability is the same as before, it seems. Speed has improved. GC has markedly improved, although we did have to experiment a bit with the new GC options. Our busiest system takes roughly 7000 hits a day, so not as busy as you, but not idle either ;) Yoav Shapira Millennium ChemInformatics -Original Message- From: Ben Ricker [mailto:[EMAIL PROTECTED]] Sent: Friday, November 22, 2002 12:29 PM To: Tomcat Users List Subject: Sun JDK 1.4 production quality? I have heard a number of differing opinions about the stability of 1.4.x version of Sun's JDK. I wanted to see if anyone runs Tomcat using 1.4.x and how they have found its stability, speed, etc. I know there have been a number of enhancements in 1.4 which sound intriguing; additionally, its jdbc driver fixes a bug that is curretnly vexing us. Our Tomcat installation gets roughly 25,000 hits a day; if you can include an approximate idea of how many hits your app takes, this information would be helpful. I would, of course, test this with load testing, but the management here seems to think we do not need it*sigh* Thanks, Ben Ricker -- To unsubscribe, e-mail: mailto:tomcat-user- [EMAIL PROTECTED] For additional commands, e-mail: mailto:tomcat-user- [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Sun JDK 1.4 production quality?
On Friday, November 22, 2002, at 11:33 AM, Shapira, Yoav wrote: GC has markedly improved, although we did have to experiment a bit with the new GC options. What conclusions did you come to? My understanding is that ConcMarkSweepGC might be helpful for Tomcat, since you could avoid the problem of the OS gathering too many network connections for Tomcat while it's garbage collecting. Nick -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
