Ninjastic
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Board Mining software (miners)
Re: Any linux script for maintain GPU temp? (changing fan speed)
by
Vince
on 12/07/2011, 17:23:22 UTC
Here's my card fan regulator tool, written in php.
It adjusts the card temp to a specific temperature. It also catches temperature changes faster and adjusts the fan better than the simple version above.

It also has some safety extras:
Set fan to 100% if card is above 96° (can be adjusted)
Clock card down to 500Mhz at 100°C (100% fan here already)

and you can change clock frequencies by typing 1 to 5 (Silent to full speed), adjust frequencies if needed. 6 is for full speed + cooler card

Have fun  Smiley


Code:

// Start with this fan speed
$fan = 40;

// Target temperature
$targetb = 86;

// At this temp switch to 100% fan
$highlim = 96;

$memspeed = 900;

$hyst = 2; $temp = 0; $target = $targetb;

while ( true) {
        $last = $temp;
        $temp = gt();
        if($last) {
                $diff = $temp - $last;
                if($diff > 2) $fan+=5+2*$diff;
                if($diff < -2) $fan-=5-2*$diff;
        }

        if($temp > $target + $hyst + 2) $fan+=4;
        if($temp > $target + $hyst + 4) $fan+=20;
        if($temp < $target - $hyst - 4) $fan-=4;
        if($temp > $target + $hyst) $fan++;
        if($temp < $target - $hyst) $fan--;
        if($fan > 100) $fan = 100;
        if($fan < 0) $fan = 0;
        if($temp > $highlim) $fan = 100;
        // At 100 Deg throttle card
        if($temp > 100) throttle();
        sf($fan);

        $a = array(STDIN);
        $l = array();

        if(stream_select($a, $l, $l, 10) > 0) {
                $d = fread(STDIN,1);
                echo "--".$d."--";
                switch($d) {
                        case '1':
                                sett(500); $target = $targetb + 1; break;
                        case '2':
                                sett(600); $target = $targetb + 1; break;
                        case '3':
                                sett(700); $target = $targetb; break;
                        case '4':
                                sett(800);  $target = $targetb - 1; break;
                        case '5':
                                sett(840); $target = $targetb - 2; break;
                        case '6':
                                sett(840); $target = $targetb - 4;
                }
        }

}

echo "\n";


function sett($speed) {
        echo "Setting clock to ".$speed."\n";
        exec("aticonfig --odsc ".$speed.",".$GLOBALS["memspeed"]);
}


function throttle() {
        echo "Too hot. Clocking card down to 500Mhz ...\n";
        exec("aticonfig --odsc 500,".$globals["memspeed"]);
}

function sf($speed) {
        echo "Setting fan to ".$speed."\n";
        exec('aticonfig --pplib-cmd "set fanspeed 0 '.$speed.'"');
}

function gt() {
        $ausgabe = array();
        $e = exec("aticonfig --odgt", $ausgabe);
        foreach($ausgabe as $line) {
                $t = explode("Sensor 0: Temperature -", $line);
                if(count($t) > 1) {
                        $t2 = explode(".", $t[1]); echo "Card at ".$t2[0]."\n"; return (int)$t2[0];
                }
        }
}


?>