> From: Harish S Rathod [mailto:
harishjss2002@...]
> Subject: Re: Question regarding Tomcat memory
>
> -Xms8192M -Xmx8192M -Xss1024K -XX:PermSize=64m -XX:MaxPermSize=256m
> -Dfile.encoding=Cp1252
That's what I surmised.
> Please suggest is this ok ?
As long as you have the RAM to hold that much heap (plus the other memory required by the process), it should be o.k. If you don't have at least 9 GB of RAM, you're going to be paging like mad, which will absolutely kill performance.
Again, setting -Xss is usually pointless. I would set PermSize to the same value as MaxPermSize, just to avoid unnecessary expansion and contraction of the PermGen.
> - Well we are using 64 bit JDK
Which one?
> - We are prinitng the heap mem using Log 4J utitiy in the
> apllication logs.
I don't know how log4j determines that value; what is shown by JConsole or LambdaProbe? (The latter can be found at www.lambdaprobe.org.)
- Chuck
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