Usage:
-XX:MaxHeapFreeRatio=<maximum>, where maximum – is maximum proportion of free space at each collection. Its total size is bound by –Xmx<max> value.
Examples:
Set minHeapFreeRatio to 70%:
java -XX:MinHeapFreeRatio=70
Description:
Different options affects generation size. During initialization of the JVM, the entire space for the heap is reserved. The size of the reserved space can be specified with the -Xmx and –Xms options. If the value of the -Xms parameter is smaller than the value of the -Xmx parameter, then not all of the space that's reserved is immediately committed to the virtual machine. The uncommitted space is called “virtual”. The different parts of the heap, so called old and young generations, can grow to the limit of the virtual space as needed.
Default Value
Default value for -XX: MinHeapFreeRatio is dependent on JVM, for instance default option for the 64-bit Solaris operating system (SPARC Platform Edition) is 40, meaning that if the percent of free space in a generation falls below 40%, then the generation expands to maintain 40% free space, up to the maximum allowed size of the generation.
Errors:
Should be less or equals to the value set in -XX:MaxHeapFreeRatio
Arguments related:
TODO link MaxHeapFreeRatio, Xmx, Xms
Related Posts:
NOTE:
If you have additional comments, interesting experiences or even point of disagreement with this JVM argument description, please leave a comment. Your insights will help the entire 10+ million java developer community to develop one standard source of documentation for all the JVM arguments.
Edit your Comment