![]() ![]() The JVM connects to an existing cache or creates a cache if one does not exist. Specify Xshareclasses option to enable class data sharing in a shared class cache. XX:MinHeapFreeRatio – sets the minimum percentage of heap free after GC to avoid expansion to monitor the heap usage, you can use JCosole. XX:MaxHeapFreeRatio – sets the maximum percentage of heap free after GC to avoid shrinking. You will essentially always have -Xmsand -Xmx together. Xmx – This option is to define the maximum heap size of JVM, e.g., Xmx2048m which means the maximum heap size of JVM will be 2 GB only. ![]() Surprisingly yes! This is carried to prevent resizing during startup and enhance the startup time of JVM. So, when a JVM starts, the heap memory will be this much big. Xms – This option is to define starting heap size for JVM, e.g., Xms2048m which means an initial heap size of JVM is 2 GB around. Java heap size -Xms - set initial Java heap size If your argument is too long, then try using ps -auxww as this command will also show a long argument list as well.Īfter having a list of JVM flags, you can get an idea about the behaviors of any Java application, e.g., Tomcat. If more than one Java process is going on the system, then you may require to go with a keyword that is unique to your Java application. If the application is running on Linux, you can use ps -ef | grep java to identify the Java process and look at the JVM options printed as process arguments. Which JVM options are used by your application? Standard options don’t prepend anything to the option. ![]() Similarly, if you’re applying a non-standard option, you use -X. If you try an advanced option, you always use the option with -XX. Talking about JVM options, then there are three types of options that you can include to your JVM, standard, non-standard, and advanced options. If you are a Java developer or middleware administrator, then you should know what JVM options mean along with their importance, and how they impact your application. Get to know essential JVM (Java Virtual Machine) options for better performance and debugging. ![]()
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