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Editorial Team
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Asked: 2026-06-03T13:57:26+00:00

The JVM specification indicates the JVM stack can be either fixed size or dynamically

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The JVM specification indicates the JVM stack can be either fixed size or dynamically expandable.

The -Xss JVM option allow to set the fixed size and if I am right not setting this option is setting a default value (around 512-2048k), but how can tell the JVM to dynamically allocate its stack when needed?

If I cannot set a dynamical size option, will setting a large -Xss value (let’s say 20M) actually allocate 20MB of memory for each thread in my JVM or is it dynamically allocated memory that will be limited to 20MB?

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  1. Editorial Team

    The maximum stack size is the amount of virtual address space that gets allocated to the stack. Memory is only committed to the stack as required.

    Note that on 32-bit systems, virtual address space is a relatively scarce resource. You get less (sometimes much less) than 4GB per process. With this in mind, a 20MB stack would limit the number of threads to anywhere between 75 and 175.

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