![]() Changes to default Java Maximum Heap Size for Java 8įrom OpenJ9 release 0.20, The default Java Maximum Heap Size ( Xmx) is changed to be consistent with Java 11, so by default in Java 8, 25% physical memory up to 25GB for the Xmx will be expected. The Xmx value is half the available memory with a minimum of 16 MB and a maximum of 512 MB. However, where there is 2 GB or less of physical memory, the value set is 50% of available memory with a minimum value of 16 MB and a maximum value of 512 MB. The Xmx value is 25% of the available memory with a maximum of 25 GB. The default values for Xmx is based on the physical memory of the machine. Customers can configure Xmx via JVM options -Xmx to optimize their Java application performance, but quite a lot of Java users never explicitly specify the -Xmx option, so in those cases the default Xmx has been used. A lower Xmx value will cause a decrease in performance due to JVM has to force frequent garbage collections in order to free up space, also if the Xmx value is lower than the amount of live data, it might trigger OutOfMemoryError. The Maximum Java Heap Size ( Xmx) is the maximum amount of memory that Java application can uses.
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