-Xms and -Xmx

[Ron Reynolds]

the point of setting start and max heap sizes to the same value is to avoid
the cost of having to increase the heap size at runtime in those cases
where you are fairly sure you will need all the heap (i.e., server
environments).  the disadvantages of setting them is that you might be
reserving more heap space than your JVM really needs, which isn't a nice
thing to do to other processes on the same box, especially if memory is
tight.  variable memory usage is normally a client thing where the load is
lower (driven my user actions).

On Wed, May 15, 2019 at 12:47 PM George Luiz Bittencourt <
george at georgeluiz.com> wrote:

> Hello,
>
> I see a lot of people in the Java world saying to configure both the -Xms
> and -Xmx parameters as the same value.
> However I don't see a reason for that. I come from the .NET world where we
> do not configure theses parameters and it works perfectly.
>
> My question is: what are the disadvantages of not configuring them as the
> same value?
> I want to visualize using top or task manager the real use of memory of my
> Java applications.
>
> Thanks,
>
> --
> -George
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>
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