I.T. Security and Linux Administration

Jul 30 2011   9:42PM GMT

vmstat Parser

Eric Hansen Eric Hansen Profile: Eric Hansen

Sharing a script here that I wrote to parse vmstat information. I know this informational program can change its output from system to system, so I can’t gurantee that it will work for you. However, this was written on Ubuntu, so I’m sure it’ll work for at least all of the Debian-based systems. The line is pretty self explanatory, granted a bit long. It basically calls vmstat, gets the last line of the output (the actual data), and outputs it in helpful information.

I wrote this tool as I couldn’t remember what all the different parts of it were for, and looked up all the information I could on the different columns. First, the code:

#!/bin/sh

# vmstat parser script. Serves no real purpose besides making the information easily readable.

# Note that this script is heavily distribution-dependent, and may (read: probably) won't work on other system.

vmstat | tail -n 1 | awk '{printf("%d processes are in wait queue, while %d are resource-blocked.\n%d blocks per second are being written to disk, while %d blocks per second are being read from disk.\nThere is a total of %d interrupts a second, and %d context switches a second.\nCPU usage: %d%% (user), %d%% (system), %d%% (idle), %d%% wait\n",$1,$2,$9,$10,$11,$12,$13,$14,$15,$16)}'

The output of this, when it works right, will look something like this:

2 processes are in wait queue, while 0 are resource-blocked.

3 blocks per second are being written to disk, while 26 blocks per second are being read from disk.

There is a total of 58 interrupts a second, and 17 context switches a second.

CPU usage: 14% (user), 1% (system), 85% (idle), 0% wait

I’m hoping that this will come in handy for someone besides me, especially since the output of vmstat itself tends to be quite vague.

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