JVisualVM for Linux console?

Question

I need to be able to do some memory sampling on a VM that's running on a linux box that doesn't have any XWindows running. I've tried to do it remotely but apparently JVisualVM does not support remote memory sampling.

What are my alternatives?

Thanks!

Answer 1

You can use jmap to take a memory sample (aka a heap dump). The command below creates a file heap.hprof in the current directory.

jmap -dump:format=b,file=heap.hprof <pid>

Once you have the sample you can transfer it to another machine for analysis with whatever tools you like. I recommend Memory Analyzer.

Answer 2

It depends on what type of sampling you want. jmap console tool (from JDK bin folder) allows some kind of memory dumping etc.