CODEWITHSUNDEEP
javamemory-management
mft
mft

Reputation: 329

JVM Heap Allocation

In our project we use Tomcat 7 server and we need to increase our Heap size up to 6 gb. Some processes in our project uses this memory.After our processes finished we apply garbage collection in our code. We follow memory allocation using Java VisualVM. There is a problem. When our processes finished, used heap size decreases but Heap size that JVM provide (6gb) doesn't decrease so our local computers have some difficulties to handle new processes.So my question is, is there a way to decrease Heap size to used heap size level? How can we manage that. I hope i can ask my situation clearly. Thanks in advice.

Upvotes: 0

Views: 318

Answers (2)

mft
mft

Reputation: 329

Eclipse release heap back to system

Above link helps us to solve our problem.

We add -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=25 -Xms256m -Xmx4096m to Tomcat VM arguments.

Upvotes: 2

Elliott Frisch
Elliott Frisch

Reputation: 201399

This behavior varies between implementations, but the default Sun/Oracle behavior would (eventually) return (some) memory to the OS (maybe). The defaults can be changed with -XX:MinHeapFreeRatio=<minimum> and -XX:MaxHeapFreeRatio=<maximum>.

By default, the virtual machine grows or shrinks the heap at each collection to try to keep the proportion of free space to live objects at each collection within a specific range.

Upvotes: 4

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