On 17/05/2010 13:18, Mercy wrote: > Hi, > > Please take a look at this: > http://java.sun.com/javase/6/docs/technotes/guides/vm/gc-ergonomics.html > > *maximum heap size:* > > Smaller of 1/4th of the physical memory or 1GB. Before J2SE 5.0, the > default maximum heap size was 64MB. You can override this default > using the |-Xmx| command-line option. > > > It does not mean just only use 1/4th, it will increase overload to > system if more than 1/4th of the physical memory.
That part of the document only describes the initial value of the maximum heap size parameter and how it is calculated, it doesn't make a recommendation for what is appropriate for a given system. I don't know what you mean by "it will increase overload to system if more than 1/4th of the physical memory"? > If you had more practical setting , please tell me. The settings will be extremely specific to each environment and the behaviour of the applications you've deployed, both inside and outside of the JVM. p > On 05/17/2010 06:49 PM, Pid wrote: >> On 17/05/2010 10:29, Mercy wrote: >> >>> Hi, >>> >>> You could set the one fourth of physical memory size(the recommended >>> heap size) for -Xms,-Xmx arguments. >>> >> Where does this recommendation come from? >> >> It would mean that with 16Gb of RAM one should only use 4Gb for the heap. >> >> >> p >> >> >>> What's more, you also analyze the heap using jmap. >>> >>> Mercy >>> >>> On 05/17/2010 05:16 PM, André Warnier wrote: >>> >>>> Ozgur Ozdemircili wrote: >>>> >>>>> Hi, >>>>> >>>>> -Rhel 5.3 x64 >>>>> >>>>> -java version "1.6.0_16" >>>>> Java(TM) SE Runtime Environment (build 1.6.0_16-b01) >>>>> Java HotSpot(TM) 64-Bit Server VM (build 14.2-b01, mixed mode) >>>>> >>>>> -Apache tomcat 6.0.26 >>>>> >>>>> -Dual core Intel(R) Xeon(R) CPU E3110 @ 3.00GHz and 4 GB memory each. >>>>> >>>>> >>>> Hè ? do you mean 4 Gb or 8GB total RAM ? >>>> >>>> --------------------------------------------------------------------- >>>> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >>>> For additional commands, e-mail: users-h...@tomcat.apache.org >>>> >>>> >>>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >>> For additional commands, e-mail: users-h...@tomcat.apache.org >>> >>> >> >> >
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