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From: Cecil Westerhof <Cecil@decebal.nl>
Newsgroups: comp.lang.java.programmer
Subject: Restricting the memory usage of a Java program
Date: Thu, 11 Aug 2016 23:42:04 +0200
Organization: Decebal Computing
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I made a little program for cropping images. When just starting it as
a Java program the memory usage was just way to much. So I wrote the
following script:
#!/usr/bin/env bash

declare -r CLASS=CropImage
declare -r MIN_MEM=128M
declare -r MAX_MEM=256M

# Make sure you are in the right directory.
# Only start the Java application when moving to the right directory was succesful.
cd "${0%/*}" && java "-Xms${MIN_MEM}" "-Xmx${MAX_MEM}" "${CLASS}" &

And now the memory consumption is much less and as far as I can see
without negative consequences for the program.

The values I use (128 MB and 256 MB) are just values I kind of
randomly choose. Is there a way to find ‘optimal’ values?


Bonus question: is there a way to limit the memory usage when the
program is started with:
    java CropImage
instead of the script?

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof