It's not a system roof, we use around 200Mb on average and under high
load we use around 700Mb with maximum heap set to 900Mb.
Also it's not tomcat using the RAM but the JVM, and yes the jvm can use
a gig of ram and even more.

One more thing, use this jsp code to monitor the JVM's heap usage.

<%@(protected)" %>
<%@(protected)" %>
<%
    long free = java.lang.Runtime.getRuntime().freeMemory();
    long total = java.lang.Runtime.getRuntime().totalMemory();
    long availableProc =
java.lang.Runtime.getRuntime().availableProcessors();
    long threadCount = java.lang.Thread.activeCount();
    long used = total - free;
    out.print(total + "," + used);
%>


Thanks
Daniel

Mindaugas Genutis wrote:

>I expect to use it a few hundred Megabytes. It was quickly increasing in
>my eyes and stopped on 150Mb. Looks like its the system roof. Could it be
>so?
>
>
>
>>Howdy,
>>If it doesn't need more than 150MB, it won't use more than 150MB... Are
>>you blindly playing around with heap numbers, or did you actually
>>determine 1GB was required to handle your max expected load?
>>
>>Yoav Shapira
>>Millennium ChemInformatics
>>
>>
>>  
>>
>>>-----Original Message-----
>>>From: Mindaugas Genutis [mailto:mindaugas@(protected)]
>>>Sent: Wednesday, January 07, 2004 2:37 PM
>>>To: Tomcat Users List
>>>Subject: Tomcat maximum heap size on Linux
>>>
>>>
>>>I wanted to increase Tomcat's maximum heap size. I did it by putting
>>>    
>>>
>>the
>>  
>>
>>>following string in the catalina.sh file (I'm running RedHat Linux):
>>>
>>>CATALINA_OPTS="-Djava.awt.headless=true -Xmx1024m"
>>>
>>>So, Tomcat can use 1Gb of my RAM.
>>>
>>>However, I'm observing Tomcat's usage with "top" under Linux and it
>>>    
>>>
>>stops
>>  
>>
>>>growing at 150Mb.
>>>
>>>Looks like this option doesn't work. Where else could I increase it?
>>>
>>>I'm using JDK 1.4.2, Tomcat 4.1.24
>>>
>>>--
>>>Kaunas Regional Distance Education Center
>>>Programmer
>>>Phone: +370 674 05232
>>>WWW: http://distance.ktu.lt
>>>
>>>
>>>
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>>
>>
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>>
>>  
>>
>
>
>