Is it possible to increase a java process's(when is running) size?

Question

I have a very important process running. I can not stop it and need to enlarge the java process' size! Is there any way to increase my java process' size online(at runtime)?

Answer 1

You can increase the following during a running process.

• number of threads
• amount of memory used by the stack (but the maximum size of an individual stack)
• amount of native memory used
• amount of memory mapped files mapped into memory
• shared libraries.

But what you can't do is increase the maximum heap size. This is what a maximum means. More technically it is because the entire heap must be a single continuous region of memory and increasing the limit wouldn't help.