In product JavaVM, the output contents of the log are expanded more than that of a standard JavaVM, so that you can acquire more troubleshooting information. The product JavaVM log is output to the Hitachi JavaVM log file. The tenuring distribution information output functionality of the Survivor area outputs the tenuring distribution information of the Java object of the Survivor area to the Hitachi JavaVM log file when executing the copy garbage collection. You can use this information for investigating the Use Status of the object of the Survivor area and for tuning the memory size of the Survivor area. For details about the tuning the memory size of the Survivor area, see 7.5.1 Estimating the memory size of the Survivor area in Java heap in the uCosminexus Application Server System Design Guide.

You can output the tenuring distribution information of the Survivor area even if XX:+PrintTenuringDistribution is specified. However, you can use the tenuring distribution information output functionality of the Survivor area, even to output the date and time, in addition to the tenuring distribution information of the Survivor area. Moreover, since the output destination is the Hitachi JavaVM log file, you can obtain synchronization with other logs.

For details about the Hitachi-specific Java VM log file, see 4.10 JavaVM Log (JavaVM Log File). Moreover, for details about the tuning of Java VM, see 7. JavaVM Memory Tuning in the uCosminexus Application Server System Design Guide.