IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator > How to do heap sizing

Using verbose:gc

You can use -verbose:gc when running your application with no load, and again under stress, to help you set the initial and maximum heap sizes.

The -verbose:gc output is fully described in Garbage Collector diagnostic data. Turn on -verbose:gc and run up the application with no load. Check the heap size at this stage. This provides a rough guide to the start size of the heap (-Xms option) that is needed. If this value is much larger than the defaults (see Default settings for the JVM), think about reducing this value a little to get efficient and rapid compaction up to this value, as described in Initial and maximum heap sizes.

By running an application under stress, you can determine a maximum heap size. Use this to set your max heap (-Xmx) value.

Parent: How to do heap sizing

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