Why does dedicated memory to a process reduces on the server?

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I am running a java code on a server. At the beginning, I checked the free memory and I found that more than 20GB of memory is free. Then I ran my code. It firstly started with around 9GB of RAM, but later decreased to around 2.7GB.

I again checked the free memory and it is still around 20GB. But I don't understand why the server has decided to decrease the dedicated memory to my process. While there are some other users who are using around 20GB of RAM for their processes and I know that there is no limitation for the users in the amount of memory they can access.

Can anyone explain why the memory decreases?

If you need more information, I would say that I am talking about the physical memory (RES). The virtual memory dedicated to my process is always 32.8GB.

asked 23 secs ago

user1419243

87

Why does dedicated memory to a process reduces on the server?