Java 13 – Uncommitted Unused Memory

What is uncommitted unused memory? 

This is actually an enhancement on a previous feature release in Java 11, the Z Garbage Collector (ZGC), which is a scalable low-latency garbage collector. The ZGC adds a small pause before the heap memory cleanup.

This results in the ZGC not returning uncommitted memory to the operating system, even when the memory has been unused for a long time. This is a big issue of concern for devices with a small memory footprint such as IoT and microchips. 

Further Reading 

JEP 351: ZGC: Uncommit Unused Memory

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