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Why does the ParallelGC change the Heap Size even if the Maximum Heap Size is the Same as the Minimum Heap Size? (Doc ID 2785525.1)

Last updated on MARCH 31, 2023

Applies to:

Java SE JDK and JRE - Version 7 and later
Information in this document applies to any platform.

Goal

According to the GC log below, the size of the heap, indicated by the number in parentheses, was changed with every GC even if the initial heap size, indicated by -XX:InitialHeapSize=3221225472 in the list of JVM options, is the same as the maximum heap size, which is specified as -XX:MaxHeapSize=3221225472.

Is this expected behavior from the Parallel garbage collector?

 

Solution

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In this Document
Goal
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