[jboss-user] [Performance Tuning] - Re: Not specifying an -Xms value

Wolf-Dieter Fink [https://community.jboss.org/people/wdfink] created the discussion "Re: Not specifying an -Xms value" To view the discussion, visit: https://community.jboss.org/message/743258#743258 -------------------------------------------------------------- I'm not sure about all JVM implementations but as far as I remember, I checked only my JDK6/7 on Fedora but worked also with Sun/HP, the OS will allocate the amount of -Xms and increase it very fast if you load big applications. But it need a bit warmup to reach -Xmx, also it is possible that the JVM free memory if the servers throughput is less in off-peak phases. So I strongly agree to Peter's statement how to set the parameter in dev/prod. What you should never do is to set the sum of all servers (-Xmx + -MaxPermSize + ThreadStackSize) to an amount near or above the physical memory. This will end up in a worst performance because of swapping. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/743258#743258] Start a new discussion in Performance Tuning at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]