Additional Metrics

The Metrics page will be used to display additional available statistics that are not displayed on the overview page. Similar to the overview page these stats are viewable in 1, 2, 6, 12, and 24-hour views, and 1 week and 1 month views.

JVM Heap

The Trustgrid service on appliance-based nodes runs via the Java Virtual Machine (JVM). When launched the java process claims a minimum amount of memory from the operating system. As the process runs additional memory can be claimed up to a configured maximum. Not all of this memory is actively in use by Java. Once the maximum amount of memory has been claimed or a period of time has elapsed Java will run a garbage collection process to free up pages of memory that are no longer being actively used.

The JVM Heap statistic shows how much of the claimed memory is actively being used. The sharp reductions in the graph below indicate times where the garbage collection process has run freeing up available memory by reducing the current heap size.