September 2016
Intermediate to advanced
989 pages
24h 10m
English
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Per-process memory usage
There are several metrics to measure the amount of memory a process is using. I will begin with the two that are easiest to obtain— the virtual set size (vss) and the resident memory size (rss), both of which are available in most implementations of the ps and top commands:
- Vss: called VSZ in the
pscommand and VIRT intop, is the total amount of memory mapped by a process. It is the sum of all the regions shown in/proc/<PID>/map. This number is of limited interest, since only part of the virtual memory is committed to physical memory at any one time. - Rss: called RSS in
psand RES intop, is the sum of memory that is mapped to physical pages of memory. This gets closer to the actual memory budget of the process, but there ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.