Why doesn't Intellij release memory after closing a project?

Question

I had three projects. One of them - Spark - was very large. When closing the spark there is NO difference in memory usage - as reported by the os / x activity monitor. Note: all projects open in the same Intellij instance.

In fact, it uses a little over 4 GB. And I have just opened two projects. These two projects take up only 1.5 GB if I turn off Intellij and run it again.

So what to do to “encourage” Intellij to free the memory it uses? It works very slowly (cannot keep up with my typing)

Update I just closed the larger of the two remaining projects. STILL no reduction in memory usage. The remaining project is a single python file . So Intellij should use up to 512Meg at this moment!

Answer 1

In response to @PeterGromov's answer, it seems like it was hard to get the memory back. In addition, @KevinKrumwiede mentioned XX:MaxHeapFreeRatiowhich seems like a prospectus.

Here are a couple of these ideas made a little further from Does GC bring memory back to the OS?

The JVM HotSpot frees memory back to the OS, but does so reluctantly.

, -XX: GCTimeRatio = 19 -XX: MinHeapFreeRatio = 20 -XX: MaxHeapFreeRatio = 30, , GC.

Java 9 -XX: -ShrinkHeapInSteps , . OpenJDK.

, . , G1 jdk8u20.

, , JVM GC.

Java?

Yiannis Xanthopoulos Hot Licks (, !), VM :

-XX: + UseG1GC -XX: MinHeapFreeRatio = 15 -XX: MaxHeapFreeRatio = 30 jdk 7 VM, 30% GC, VM . , , .

, , , java , (, UseG1GC ).

-XX:MaxHeapFreeRatio IJ , .

Java7, - , jdk8.

Answer 2

Java . IDE , .

Answer 3

https://www.jetbrains.com/help/idea/status-bar.html

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