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This subchapter looks at vmstat, a UNIX (and Linux) command.
vmstat is used to show virtual memory usage.
free book on UNIX/Linux System AdministrationTeach Yourself UNIX/Linux System Administration and Shell Programming free computer programming text book projecttable of contents
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This subchapter looks at vmstat, a UNIX (and Linux) command.
vmstat is used to show virtual memory usage.
Type vmstat to see a list of virtual memory statistics. Especially useful in a virtualized enivronment.
$ vmstat
vm_stat is a Mach-specific version of the UNIX command vmstat:
$ vm_stat
Mach Virtual Memory Statistics: (page size of 4096 bytes)
Pages free: 5538.
Pages active: 142583.
Pages inactive: 76309.
Pages wired down: 37531.
"Translation faults": 4427933.
Pages copy-on-write: 54807.
Pages zero filled: 3086159.
Pages reactivated: 6533.
Pageins: 46357.
Pageouts: 4453.
Object cache: 66465 hits of 76770 lookups (86% hit rate)
In June 2009, Ken Milberg named this command as one of the Top 50 universal UNIX commands at this web page Top 50 Universal INIX commands. Note that this web page requires agreeing to be spammed before you can read it.
Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).
View music player in action: www.musicinpublic.com/.
Create your own copy from the original source code/ (presented for learning programming).
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Because I no longer have the computer and software to make PDFs, the book is available as an HTML file, which you can convert into a PDF.
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free book on UNIX/Linux System AdministrationTeach Yourself UNIX/Linux System Administration and Shell Programming free computer programming text book projectBuilding a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming. If you like the idea of this project, Supporting the entire project: If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church) Some or all of the material on this web page appears in the |
This web site handcrafted on Macintosh 
computers using Tom Bender’s Tex-Edit Plus 
and served using FreeBSD 
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†UNIX used as a generic term unless specifically used as a trademark (such as in the phrase “UNIX certified”). UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.
Names and logos of various OSs are trademarks of their respective owners.
Copyright © 2012, 2014 Milo
Created: July 11, 2012
Last Updated: June 7, 2014
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