I really don't know what -Xss is for, I'll probably lower it now, at least to 1024k, i'm just experimenting. -Xmn though does make a big difference in my case. I can't get my load faster than 6 req/sec with CPU at 14% and memory usage at 11% using the "top" command in Linux Redhat.
Jacob Kjome <[EMAIL PROTECTED]> wrote: It shouldn't do anything because of case sensitivity. As I said before, it isn't "100M", it is "100m". And I still think that Xss value has got to be a bit off, but if it works for you, who am I to say you shouldn't use it. Jake At 09:05 AM 2/16/2004 -0800, you wrote: >JAVA_OPTS = "-server -Xincgc -Xmx1024M -Xms1024M -Xmn100M -Xss100M" >-Xmn is the size of the younger generation heap. Before having -Xmn my >CPU was running at 95% while memory was at 4%. After putting -Xmn my CPU >and memory usage are both aroun 11 %. >-Tom > >Jacob Kjome wrote: > >The JAVA_OPTS settings below are doing nothing whatsoever. Tom, you need >to remember that these are case sensitive. You must add "m" for Megabytes >and "k" for Kilobytes, not "M" or "K". You didn't even provide a value for >-Xmx. And why are you attempting to set -Xss to 100 Megabytes? The >default is 512k. I've never bothered setting that before, but I have to >think that 100m is just a bad idea. And I don't even think that -Xmn is an >option. I've never seen it in the docs. > >Based on this, I don't think you really have a good understanding of how to >tweak JVM performance. I suggest reading the docs before posting to the >list... > >http://java.sun.com/docs/hotspot/VMOptions.html > >Jake > > >At 09:24 AM 2/15/2004 +0100, you wrote: > >Try disabling name resolution (see previous posts, I can't remember how > >this is done), just in case. > > > >How does your CPU perform? Is it idle all time, or completely busy? > > > >Antonio Fiol > > > >tom ly wrote: > > > >>I've got Tomcat set up as the middle component passing heavy XML data > >>between and client and a backend and it is very very slow. I've set a > >>filter up to log the time it takes to process a request and loadtest with > >>JMeter using 10 threads. Takes around 25,000ms to get a response from > >>looking at JMeter. But when I look at the catalina logs, the times are > >>not too bad, 700-800ms/request to receive and process a request. Seems > >>like most of the problem is with connection speed, not processing > >>speed. I've played around with my JAVA_OPTS and have got it to improve a > >>bit, but I'm always getting the really high response times. Here are my > >>JAVA_OPTS = "-server -Xincgc -Xmx1024M -Xmx1024 -Xmn100M -Xss100M" I'm > >>using Sun SDK 1.4.1. What else can I do to improve the > >>performance? What about using keepalive? > >> > >> > >>--------------------------------- > >>Do you Yahoo!? > >>Yahoo! Finance: Get your refund fast by filing online > >> > > > > > > > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > >--------------------------------- >Do you Yahoo!? >Yahoo! Finance: Get your refund fast by filing online --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------- Do you Yahoo!? Yahoo! Finance: Get your refund fast by filing online
