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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