If I am not mistaken they are the same in Linux. With the Java command you have the 2 options:

• Xmx sets the maximum memory heap size.


• Xms sets the minimum memory heap size.

So doing -Xmx1024m -Xms128m should work.

Here is an extract from doing a man java in the terminal

-Xmsn

                Specify the initial size, in bytes, of the memory allocation

                pool. This value must be a multiple of 1024 greater than 1MB.

                Append the letter k or K to indicate kilobytes, or m or M to

                indicate megabytes. The default value is chosen at runtime

                based on system configuration. For more information, see

                HotSpot Ergonomics

                Examples:



                       -Xms6291456

                       -Xms6144k

                       -Xms6m



 -Xmxn

                Specify the maximum size, in bytes, of the memory allocation

                pool. This value must a multiple of 1024 greater than 2MB.

                Append the letter k or K to indicate kilobytes, or m or M to

                indicate megabytes. The default value is chosen at runtime

                based on system configuration. For more information, see

                HotSpot Ergonomics

                Examples:



                       -Xmx83886080

                       -Xmx81920k

                       -Xmx80m

So that basically sums it up about doubts using the same parameters.

To use this go to a terminal and type it with a jar program. In my example I am using the minecraft server: java -Xms1024M -Xmx2048M -jar minecraft.jar.

Here is an image of what happens:

I should note that the parameters are Case Sensitive. So xmx1024M is not the same as Xmx1024M.