>
> ​What is the best way to determine the right value for this? I remember 
> that in the past I had a lot of little Java​
>  
> ​programs running and got a much better performance by limiting memory 
> usage.
>


That is not an easy question to answer. If you make it too small your 
process may crash with OutOfMemory errors, if you give it just enough it 
will constantly be running running garbage collections making your program 
slower. So "just right" is very dependent on your program and also on what 
else is happening on the machine running it. You can use tools like 
JVisualVM or Java Mission Control to better understand your system but that 
takes a lot of time and effort.

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