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Hands-On High Performance with Spring 5 by Dinesh Radadiya, Prashant Goswami, Pritesh Shah, Subhash Shah, Chintan Mehta

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JVM Heap Size

This section in the report provides information on the heap allocation and peak memory usage for each memory generation. It is possible that the allocated heap size may not match the one defined in the JVM parameters. This is because the GCeasy tool obtains the allocated memory information from the logs. It is possible that we have allocated 2 GB of heap memory, but at runtime, JVM could allocate only 1 GB of heap memory. In such a case, the report will show the allocated memory as 1 GB. The report shows the heap allocation in tabular and graphical formats. The following is an example heap size section from the report:

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