On Sun, Jan 12, 2003 at 10:21:09PM +0200, Nadav Har'El wrote:
> On Sun, Jan 12, 2003, guy keren wrote about "Re: 99.6% idle 5.16 load":
> > > If you have load 5 but no process is using CPU time, it is most likely
> > > that you have 5 processed in the "D" (uninterruptable sleep) state. Run
> > > "ps aux" and look for a "D" in the STAT column to confirm this hunch.
> >
> > this sounds odd - a process in the 'D' state is in an uninterruptible wait
> > on a resource. thus, it is not supposed to be in the 'ready' (or 'run')
> > queue, and hence shouldn't be counted inside the 'load average' (which
> > counts the number of processes in the 'ready' queue or the 'running'
> > state, in the last X minutes).
>
> And yet, according to my experience, in Linux it does get counted.
> Obviously it is not in the run queue, but perhaps the "load" does not
> count only the run queue. I don't know - if anybody here can volunteer
> to look at the kernel source, I'd be happy to know the answer to that
> riddle.
I did, since it bothers me for a long time.
It is indeed so, for a very long time (actually always - I checked 1.0,
1.2.12, 2.0.39, 2.2.23 and 2.4.20). Also, when you know what to look for,
google is your best friend:
Searching for '"load average" TASK_UNINTERRUPTIBLE' returns, as the second
result, an email from 1995 (by soemone named Rob Janssen) that says:
" > 2. The processes counted toward the load average, but didn't consume
> CPU time. The load average on the still-working machine was >35.
This is why I always apply the following patch:"
(and a patch to not count TASK_UNINTERRUPTIBLE tasks).
Didi
>
> (Oh, and Gabor, is my guess even correct? Do you have any D-state processes?)
>
> --
> Nadav Har'El | Sunday, Jan 12 2003, 10 Shevat 5763
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