Date: Wed, 11 Apr 2007 09:28:45 -0500 From: Derek Ragona <derek@computinginnovations.com> To: Gary Kline <kline@tao.thought.org> Cc: Rick Olson <rick@napalmriot.com>, Gary Kline <kline@tao.thought.org>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: awk question Message-ID: <6.0.0.22.2.20070411092614.025752d8@mail.computinginnovations.com> In-Reply-To: <20070411004319.GC35246@thought.org> References: <20070306003506.GA12553@thought.org> <6.0.0.22.2.20070306072709.02577448@mail.computinginnovations.com> <20070306165349.GA67829@thought.org> <461AEE3F.2010107@napalmriot.com> <20070410231701.GA35246@thought.org> <6.0.0.22.2.20070410183124.024f8b10@mail.computinginnovations.com> <20070411004319.GC35246@thought.org>
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At 07:43 PM 4/10/2007, Gary Kline wrote:
>On Tue, Apr 10, 2007 at 06:35:33PM -0500, Derek Ragona wrote:
> > At 06:17 PM 4/10/2007, Gary Kline wrote:
> > >On Mon, Apr 09, 2007 at 06:54:07PM -0700, Rick Olson wrote:
> > >> I'm assuming you've already taken care of this, but to answer your
> > >> original question in AWK form, you could have done the following:
> > >>
> > >> ls -l | awk '$8 == 2006 {system("rm " $9)}'
> > >>
> > >
> > > i'Ll save your snippet to my growing %%% awk file in my ~/HowTo,
> > > thankee much. I'm in the first stages on a months-long trial on
> > > system tuning. This, before I'd risk publishing anything. So
> > > far tho, by upping and lower the NICE prio of various binaries, I
> > > have been able to get more than 70% efficient use out of my older
> > > servers. ---This *ought* to carry over to my faster machines....
> > >
> > > Is tthere a way of using ps -alx | ask to look at nice and if it
> > > is non-zero (the default), to reset it to zero?
> >
> > You can easily do some of this using top, such as:
> > top -bS 200 | tail -n +9 | awk '{ print $5 }'
> >
> > If you want to tweak the nice value you'd need to examine the value and
> > then renice it as long as you are root. You'd need the PID for that, so
> > here's another example:
> > top -bS 200 | tail -n +9 | awk '{ printf("Pid: %d has Nice: %d\n",
> $1,$5) }'
> >
>
> Well, I knew there had to be a "static" way to read top. -bS is
> it. If NICE is 9, then renice-n -9 pid ought to reset it to 0;
> so in C, the check for nice or "n" would be trivial:
>
> if (n != 0)
> n = -n;
>
> In you example, would this be if ($1 != 0) $1 = -$1;
> then a '{system("renice -n $")};
> or is this disallowed in awk?
>
> gary
It is easier to redirect the output to a file then just execute that
file. You'd usually have this in a shell script run by cron.
top -bS 200 | tail -n +9 | awk '{ if ($1 != 0) printf("/usr/bin/renice %d
%d\n", $1,-$5) }' > /tmp/renice.scr
sh -c /tmp/renice.scr
But look at the file generated, you need to do more than just the check for
0 and then negate it.
-Derek
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