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    <p>One of the Java Champions, Kirk Pepperdine's blog : <a href="http://kirk.blog-city.com/how_to_cripple_gc_ergonomics.htm" rel="noreferrer">http://kirk.blog-city.com/how_to_cripple_gc_ergonomics.htm</a>. <br> Quote 1 "GC documentation will tell you what the setting affects but often without telling what the effect will be. The biggest clue that you've taken the wrong fork in the road is when you explicitly set a value and then give a hint to GC ergonomics. Another clue is if you don't have a sound reason to adjust a setting. And just because some so called expert says this setting works best is only noise, not sound and certanly not a reason."</p> <p>Quote 2 "As I've stated in a prevous blog entry , don't touch the knobs unless you have a very good reason to do so. If you must touch the knobs, tred lightly by only using those that help ergonomics and not those that pin things down crippling ergonomics ability to meet your pause time and throughput goals."</p> <p>So, I would suggest that you go back to plain <br> -server -Xms1280m -Xmx1280m -XX:MaxPermSize=512m -XX:+UseConcMarkSweepGC -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:-TraceClassUnloading -Dsun.io.useCanonCaches=false -Dsun.net.client.defaultConnectTimeout=60000 -Dsun.net.client.defaultReadTimeout=60000</p> <p>Find if that gives you better performance. If yes, stick to it <br> BTW, did -XX:MaxPermSize=378m have any issues ? <br> Java 1.6 has much better ergonomics than 1.4. You might want to tune it less than 1.4<br> BTW, did you try Tomcat 6 ? Tomcat 6 runs much better on Java 6 than Tomcat 5.5.<br></p> <p>P.S : I've been using Tomcat for a while now and usually try to give sun's JDK free reign with little tuning here and there.</p>
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