Azul Zing^® introduces a new Elastic Heap feature (aka Best Effort Elasticity or BEE) that allows you to:

• skip specifying the -Xmx memory parameter when launching your Java virtual machine
• keep -Xmx low but make sure that your Java virtual machine can handle peak loads that require a higher amount of memory
• efficiently share server memory between multiple JVMs and non-Java native applications

The Elastic Heap feature satisfies the above scenarios by providing flexibility to borrow memory above the value specified by -Xmx from a common memory allocation pool without an impact on your system performance. This alleviates the need to configure each virtual machine with a large amount of memory space thereby reducing the total RAM requirement. The borrowed memory is returned as soon as the garbage collector detects that the memory pressure is back to normal, letting other virtual machines on the same operating system instance access the memory.

Enabling Elastic Heap

To enable the Elastic Heap feature, use the following option:

-XX:+BestEffortElasticity

Tips

• To specify an initial guaranteed heap, use -Xms and add -XX:+BestEffortElasticity.
• To limit memory usage ever consumed by Zing virtual machine heap, set the desired value inside -XX:JavaMemMax.

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What’s New?	See Also:
JDK 11 Support Zing® Feature Preview Quick Start Guide JEP 254: Compact Strings Quick Startup and Warmup with ReadyNow! and Compile Stashing	Zing System Requirements Zing Troubleshooting Guide Zing Virtual Machine Release Notes Zing User’s Guide Zing Community Forum