![]() A better explanation of what Virtual memory really used by a Java process is discussed here. In fact, max memory is not even checked against physical memory on JVM startup even with swap off on OS. "Don't quote me on this" but VIRT mem is roughly close to or more than Max memory allocated but as long as memory being used is free/available in physical memory, JVM does not throw memory exception. It shows a snapshot of total/free physical memory and swap space of the system, as well as used/free buffer space in the kernel. Assuming you run a simple class with no mmap or file processing. ![]() ![]() You can then guarantee and also do ps to see what parameters were passed and hence being used.įor actual memory usages, you can roughly compare VIRT (allocated and shared) and RES (actual used) compare against the jstat values as well:įor Java 8, see jstat for these values actually mean. It is always a good idea to allocate the heap using -X.m -X.x for all generations. Any approach should give you roughly same number. How to Calculate Memory Usage in Linux using sar, ps, and free It is important to find the process or application hogging memory of the system in case of a.
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