Mamimum Java heap size of a 32-bit JVM on a 64-bit OS – this one has an answer from me where you can measure the maximum heap allocation using Java’s Runtime class.

Java maximum memory on Windows XP – see in particular the answers with links to IBM and Oracle JRockit, and especially an explanition about contiguous heap.

UPDATE: 20110731 - Some more answers and links at Stack Overflow Allocating a heap size greater than this amount does not work. On the 32-bit Windows platform, JVM programs can only ever use up to about 1.5–1.6 GiB of memory in RAM per Java VM process.

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Increase java heap size weka ubuntu