How To Change Xms And Xmx In Java

Apache Tomcat is widely used Web Container in the globe. Very large companies run on Apache Tomcat at present a days. There are quite a few other alternatives similar IBM WebSphere, Geronimo, IIS, etc. simply Tomcat is my favorite one too.

It'due south very disquisitional for us to configure all correct parameters while running your awarding in Product environment or even in development env.

In this tutorial we will go over steps on how to configure -Xms, -Xmx and -XX:PermSize value for Tomcat server. Permit's kickoff understand few terms.

-Xmx

Specifies the maximum size, in bytes, of the memory allocation pool. This value must a multiple of 1024 greater than 2MB. Suspend the letter k or K to indicate kilobytes, or m or M to indicate megabytes. The default value is 64MB. The upper limit for this value will exist approximately 4000m on Solaris vii and Solaris viii SPARC platforms and 2000m on Solaris 2.6 and x86 platforms, minus overhead amounts. So, in unproblematic words, y'all are saying Java to use Maximum of 1024 MB from bachelor memory.

Annotation: there isNO SPACE between -Xmx and 1024m

-Xmn

It'southward a size of the heap for the immature generation.

-XX:PermSize

It's used to set size for Permanent Generation. It is where form files are kept.

Another must read: Modify -Xmx value of Tomcat in Eclipse IDE

Allow's get started:

Below are the simple steps to change -Xmx / -Xms values or other JVM parameters if you are running Tomcat from command prompt.

Footstep-1

Download Apache Tomcat.

Step-2

Go to Apache Tomcat /bin directory.

Stride-three

Past default you wont see setenv.sh (for Linux/Mac) or setenv.bat (for windows) file under /bin directory. You have to create one with beneath parameters.

export CATALINA_OPTS="$CATALINA_OPTS -Xms512m"

export CATALINA_OPTS="$CATALINA_OPTS -Xmx8192m"

export CATALINA_OPTS="$CATALINA_OPTS -Twenty:MaxPermSize=256m"

Step-four

Go to command prompt.
Go to <Tomcat Directory>/bin directory
Execute command: ./catalina.sh run

Step-five

Monitor logfile and y'all should encounter your Tomcat started with all your specified parameters in setenv.sh file.

Command for Windows Environment:

Y'all need to create setenv.bat file with below content:

set "JAVA_OPTS=%JAVA_OPTS% -Xms512m -Xmx8192m -20:MaxPermSize=256m -server"

and run Tomcat with catalina.bat

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