Re: [gentoo-user] Help interpreting top(1) display

Re: [gentoo-user] Help interpreting top(1) display

[Adrian Chelar]

no problem

----- Original Message -----
From: "Kevin O'Gorman" <kogorman@gmail.com>
To: <gentoo-user@lists.gentoo.org>
Sent: Wednesday, July 06, 2005 3:07 AM
Subject: Re: [gentoo-user] Help interpreting top(1) display


> Okay, thanks.  They are indeed niced, because there are a lot of them, and
> I would like my keystrokes echoed sometime today....
>
> OTOH, where can I read about the others?
>
> ++ kevin
>
> On 7/5/05, Calvin Walton <calvin.walton@gmail.com> wrote:
> > On 7/5/05, Kevin O'Gorman <kogorman@gmail.com> wrote:
> > > Cpu0  :  1.3% us,  1.9% sy, 96.0% ni,  0.8% id,  0.0% wa,  0.0% hi,
0.0% si
> > >
> > > I'm running a bunch of compute-bound tasks, so I suppose the 'ni'
fields
> > > indicate heavy use, but what exactly does 'ni' mean?  And what do the
other
> > > fields mean -- if the 'us' field means 'user' then I'm really baffled.
> > >
> > > The man page is most helpful in deciphering the task displays, but I
was
> > > unable to find a part about the header fields.
> > > --
> > > Kevin O'Gorman, PhD
> >
> > The full names for the first three are user, system, and nice. It
> > appears that the tasks your are running are being run 'niced', see man
> > nice. The priority is set to lower (or possibly higher, i'm not
> > sure...) than regular tasks in the system, and the cpu usage shows up
> > under nice instead of user.
> >
> > --
> > Calvin Walton
> >
> --
> Go back to the top: I almost always top-post
> Kevin O'Gorman, PhD
>
> --
> gentoo-user@gentoo.org mailing list
>

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Re: [gentoo-user] Help interpreting top(1) display

[Alexander Kirillov]

top reads some tick counters from /proc/stat
provided by the kernel and defined as

struct cpu_usage_stat {
	cputime64_t user;
	cputime64_t nice;
	cputime64_t system;
	cputime64_t softirq;
	cputime64_t irq;
	cputime64_t idle;
	cputime64_t iowait;
	cputime64_t steal;
};

in kernel_stat.h

You probably can guess the meaning better than I could:

# time spent waiting for IO to complete
wa=iowait

# time spent within hardware interrupt handlers
hi=irq

# time spent within other critical sections within the kernel
si=softirq

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