Memory stats on Linux

Did you ever wonder what the VIRT, RES and SHR memory figures in top on Linux are supposed to tell you?

Here we go:

  • VIRT – How much memory the process is able to access at the moment.
  • RES – How much memory the process is actually using at the moment. This is the value you should probably be looking at and corresponds with the %MEM column.
  • SHR – How much of the VIRT memory is shareable.

Continue here if you want more details:
http://mugurel.sumanariu.ro/linux/the-difference-among-virt-res-and-shr-in-top-output

A peek at the man page top might also help:

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