| Sam Granger |
04-26-2009 06:28 PM |
CPU load function - division by zero error :(
The following function seems to give me a Division by Zero error - not all the time but quite a lot of the time.
PHP Code:
class Linux_Server extends ServerLoad {
function loadAverage($bar = false) {
$results = array();
if ($fd = @fopen('/proc/loadavg', 'r')) {
$results['avg'] = preg_split("/\s/", fgets($fd, 4096),4);
unset($results['avg'][3]); // don't need the extra values, only first three
fclose($fd);
} else {
$results['avg'] = array('N.A.', 'N.A.', 'N.A.');
}
if ($bar) {
if ($fd = @fopen('/proc/stat', 'r')) {
fscanf($fd, "%*s %Ld %Ld %Ld %Ld", $ab, $ac, $ad, $ae);
// Find out the CPU load
// user + sys = load
// total = total
$load = $ab + $ac + $ad; // cpu.user + cpu.sys
$total = $ab + $ac + $ad + $ae; // cpu.total
fclose($fd);
// we need a second value, wait 1 second befor getting (< 1 second no good value will occure)
sleep(1);
$fd = fopen('/proc/stat', 'r');
fscanf($fd, "%*s %Ld %Ld %Ld %Ld", $ab, $ac, $ad, $ae);
$load2 = $ab + $ac + $ad;
$total2 = $ab + $ac + $ad + $ae;
$results['cpupercent'] = (100*($load2 - $load)) / ($total2 - $total);
fclose($fd);
}
}
return $results;
}
}
PHP Code:
$results['cpupercent'] = (100*($load2 - $load)) / ($total2 - $total);
- the line that gives the error.
What am I doing wrong? :-/ |
