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?
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