Release Java Heap Sapce
I have an issue with java performance. I tried using GC1 but it didn't make things great. My only question is why the JVM keeps the java heap space even if it's not used ?
As you can see in the picture first the batch work finish around 10:30 but the garbage collector wasn't triggered to clean. So I did it manually at 10:52 then the used space was freed but heap (8GB) is still allocated by the JVM. Why ?
I've seen this trend too while doing the exact same thing that you did (and see here). The explanation is quite simple: JVM will not give back memory to the OS, even if it has lots of it free. I don't know the exact details of why this is so, but it has to do with the fact that asking memory back from the OS is expensive (this is ultra-simplified).
So I guess that the simple answer here is that - this is normal.
Here it is! I found where I have actually read about this.
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