Gallows: /* Script */

2006-10-05T11:51:43Z

‎Script

L1q1d il 09:46, 12 set 2006

2006-09-12T09:46:15Z

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[[Category:Script]]
= Descrizione =
Cpuscaling, script che permette di settare (tramite scrittura sul sysfs) un determinato range di frequenze per la cpu oppure di selezionare una modalità di comportamento predefinita tra quelle disponibili dal kernel, le quali vanno dal risparmio dell'energia (powersave), al pieno sfruttamento della cpu (performance), passando per governor intermedi che aumentano la frequenza della cpu in relazione ai programmi in esecuzione. Ovviamente tali feature devono essere presenti nel kernel (anche non built-in, ci pensa lo script a caricare i moduli).
= Script =
<pre>
#!/bin/bash
#
# cpuscaling v. 0.0.2
# by Sergio Perticone <gall0ws [at] tiscali [dot] it>
#
# cpuscaling allows you to change the clock speed of CPU on the fly.
#
# suggest: put this in /usr/sbin
#
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#
# for limited user(s) you can use sudo(8), it works fine ;)
#
# add in your /etc/sudoers something like this:
# -------------------------------------------------------
# your_user ALL=(ALL) NOPASSWD: /usr/sbin/cpuscaling
# -------------------------------------------------------
# so:
# $ sudo /usr/sbin/cpuscaling [ options ]
#
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#
# oh yes, it's (dirty) GPL code: <http://www.gnu.org/licenses/gpl.txt>
#

# set some variables:
SYSDIR="/sys/devices/system/cpu/cpu0/cpufreq"
AVAILABLE_GOVERNORS="$SYSDIR/scaling_available_governors"
GOVERNOR="$SYSDIR/scaling_governor"
FREQMAX="$SYSDIR/scaling_max_freq"
FREQMIN="$SYSDIR/scaling_min_freq"
FREQCUR="$SYSDIR/scaling_cur_freq"
FREQS="$SYSDIR/scaling_available_frequencies"

function usage() {

cat << END
Usage:
cpuscaling [ governor ] | [ -f, --freqs ] | [ -M, --fmin ] | [ -m, --fmin ] FREQ

conservative Tune governor to conservative
ondemand Tune governor to ondemand
performance Tune governor to performance
powersave Tune governor to powersave
userspace Tune governor to userspace

-f, --freqs Print frequences supported by your CPU
-M, --fmax FREQ Set max frequence
-m, --fmin FREQ Set min frequence
-s, --state Show current state

-h, --help Print this help and exit

Report bugs to <gall0ws [at] tiscali [dot] it>.
END
}

function only_root__exit() {

echo "Only superuser can do it."
exit 1
}

function something_wrong__exit() {

echo "Failed. Please check your kernel settings."
exit 1
}

function no_freq__exit() {

echo "Please choose a frequence."
exit 1
}

function show_state() {

printf "governor:\t `cat $GOVERNOR`\n"
printf "current :\t `cat $FREQCUR` Hz\n"

[ "$GOVERNOR" == "performance" ] && exit 0

[ "$GOVERNOR" == "conservative" ] && {
printf "freq:\t `cat $FREQMIN` Hz\n"
exit 0
}

printf "freq min:\t `cat $FREQMIN` Hz\n"
printf "freq max:\t `cat $FREQMAX` Hz\n"
}

function show_freqs() {

cat $FREQS
exit 0
}

function freq_min() {

[ "$UID" != "0" ] && only_root__exit

echo -n $FREQ > $FREQMIN
show_state
exit 0
}

function freq_max() {

[ "$UID" != "0" ] && only_root__exit

echo -n $FREQ > $FREQMAX
show_state
exit 0
}

function set_governor() {

[ "$UID" != "0" ] && only_root__exit

# if governor seems not to be available then I try to load module:
grep -q $NEW_GOVERNOR $AVAILABLE_GOVERNORS || {
/sbin/modprobe cpufreq_$NEW_GOVERNOR || something_wrong__exit # mmm, check your config :/
}
echo -n $NEW_GOVERNOR > $GOVERNOR
exit 0
}

# parser:
case "$1" in

'conservative'|'ondemand'|'performance'|'powersave'|'userspace')
NEW_GOVERNOR=$@
set_governor
;;

'--freqs'|'-f')
show_freqs
;;

'--fmax'|'-M')
[ -z "$2" ] && no_freq__exit
FREQ="$2"
freq_max
;;

'--fmin'|'-m')
[ -z "$2" ] && no_freq__exit
FREQ="$2"
freq_min
;;

'--state'|'-s')
show_state
;;

'--help'|'-h'|'-wtf')
usage
;;

'')
echo "cpuscaling: too few arguments"
echo "Try \`cpuscaling --help' for more information."
;;

*)
echo "cpuscaling: invalid option -- $1"
echo "Try \`cpuscaling --help' for more information."

esac

## EOF ##

</pre>
* Data: 03 Jun 2006
* Autore: Gallows
* Versione: 0.0.2

Cpuscaling - Cronologia

Gallows: /* Script */

L1q1d il 09:46, 12 set 2006