IBM User Guide for Java V7 on Windows > Reference > Command-line options > Garbage Collector command-line options
-Xmx
Sets the maximum memory size (-Xmx >= -Xms).
- -Xmx<size>
- For information about default values, see Default settings for the JVM.
If you are allocating the Javaâ„¢ heap with large pages, read the information provided on -Xlp in JVM command-line options.
Examples of the use of -Xms and -Xmx:
- -Xms2m -Xmx64m
- Heap starts at 2 MB and grows to a maximum of 64 MB.
- -Xms100m -Xmx100m
- Heap starts at 100 MB and never grows.
- -Xms20m -Xmx1024m
- Heap starts at 20 MB and grows to a maximum of 1 GB.
- -Xms50m
- Heap starts at 50 MB and grows to the default maximum.
- -Xmx256m
- Heap starts at default initial value and grows to a maximum of 256 MB.
Parent: Garbage Collector command-line options
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