When using -Xmx flag, what happens if the argument given exceed physical memory?

Question

Also is there any way to explicitly make JVM to use a specific amount of memory using paging?

For the first question: The JVM will execute just fine. It might crash when it tries to allocate more memory than what is available, but it'll start up fine. Not sure if/how virtual memory plays into this. No idea about the second question. — awksp
– awksp, Commented Jun 9, 2014 at 22:54
Are you talking about a specific brand of JVM at all? They do differ in their memory handling implementations. — Stewart
– Stewart, Commented Jun 9, 2014 at 23:08

aa333 · Accepted Answer · 2014-06-09 23:06:08Z

1

See for yourself:

Trying for a heap too large

JVM fails in getting enough memory for the heap and exits.

I don't think there is a way to make JVM use a specific amount of memory for paging, but you can use:

-XX:+|-UseLargePages --for large page support

and -XXLargePageSizeInBytes=<n> --for specifying how large your large pages can be.

answered Jun 9, 2014 at 23:00

aa333

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