APLawrence.com -  Resources for Unix and Linux Systems, Bloggers and the self-employed

vmstat i/o time shows 0 IO

© May 2019 Anthony Lawrence

From: Netocrat <netocrat@dodo.com.au>
Subject: Re: Why am I not using 100% of cpu?
Date: Thu, 18 Aug 2005 22:56:36 +1000
Message-ID: <pan.2005.> 
References: <wx0oe7wvf33.fsf@sws5.ornl.gov>
<wx0acjf8klt.fsf@sws5.ornl.gov> On Thu, 18 Aug 2005 09:01:34 -0400, Dave Sill wrote: > Netocrat <netocrat@dodo.com.au> writes: > >> Do you mean top or vmstat? In another post you wrote that the output was >> from vmstat, in which case perhaps your kernel version is too old. > > Both top and vmstat. > >> From the vmstat manpage: >> wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero. > > Well, that's bogus. If they're not reporting valid data, they should > make it look like valid data. If they'd used a dash instead of a 0, > I'd have known what was going on. Thanks for pointing that out. > > So now the question is: is I/O wait time counted as idle/system/user > time, or is it just not counted at all? I forgot to include the preceding line which would have made a difference; here they both are: id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time. wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero. -- https://members.dodo.com.au/~netocrat

Got something to add? Send me email.

(OLDER)    <- More Stuff -> (NEWER)    (NEWEST)   

Printer Friendly Version

-> vmstat i/o time shows 0 IO

Inexpensive and informative Apple related e-books:

Take Control of Parallels Desktop 12

Take Control of Upgrading to El Capitan

El Capitan: A Take Control Crash Course

iOS 10: A Take Control Crash Course

Sierra: A Take Control Crash Course

Printer Friendly Version

Have you tried Searching this site?

This is a Unix/Linux resource website. It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

Contact us

Printer Friendly Version

There are two ways to write error-free programs; only the third one works. (Alan Perlis)

Linux posts

Troubleshooting posts

This post tagged:


Unix/Linux Consultants

Skills Tests

Unix/Linux Book Reviews

My Unix/Linux Troubleshooting Book

This site runs on Linode

SCO Unix Sales, Support, & Service

Phone:  707-SCO-UNIX (707-726-8649Toll Free: 833-SCO-UNIX (833-726-8649)