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Increase heap memory server startup JVM tuning |
There can be many reasons to change max and min memory settings in tomcat. Mostly you may want it because you are getting
java.lang.OutOfMemoryError exception.
Use following parameters to change heap memory
-Xms initial java heap size
-Xmx maximum java heap size
To change amount of memory tomcat is using go to tomcat6\bin and edit catalina.bat file. Search for
JAVA_OPTS line.
Now change or add -Xms128m -Xmx384m to catalina.bat file. (change 128 and 384 as per machine memory)
set JAVA_OPTS=%JAVA_OPTS% -Xms128m -Xmx384m -server -XX:PermSize=128m -XX:MaxPermSize=192m
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file="%CATALINA_BASE%\conf\logging.properties"
Following code checks current memory usage in tomcat
checking-memory-usage.jsp
<%
Runtime s_runtime = Runtime.getRuntime ();
out.println("Total Memory: "+s_runtime.totalMemory ()/(1024*1024)+" MB");
out.println("<br/>");
out.println("Free Memory: "+s_runtime.freeMemory()/(1024*1024)+" MB");
out.println("<br/>");
out.println("Memory used: "+(s_runtime.totalMemory () - s_runtime.freeMemory())/(1024*1024)+" MB");
%>
Various other parameters can be set in JAVA_OPTS. Look at java -X to determine what parameters to set.
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