unset($db_host, $db_user, $db_pass, $db_data);
};
- $maxsysload = intval(get_config('system','maxloadavg'));
- if($maxsysload < 1)
- $maxsysload = 50;
if(function_exists('sys_getloadavg')) {
+ $maxsysload = intval(get_config('system','maxloadavg'));
+ if($maxsysload < 1)
+ $maxsysload = 50;
+
$load = sys_getloadavg();
if(intval($load[0]) > $maxsysload) {
logger('system: load ' . $load[0] . ' too high. poller deferred to next scheduled run.');
if (!posix_kill($pid["pid"], 0))
q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
intval($pid["pid"]));
+ else {
+ // To-Do: Kill long running processes
+ // But: Update processes (like the database update) mustn't be killed
+ }
} else
// Sleep two seconds before checking for running processes to avoid having too many workers
sleep(4);
// Checking number of workers
- $workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
-
- $queues = intval(get_config("system", "worker_queues"));
-
- if ($queues == 0)
- $queues = 4;
-
- if ($workers[0]["workers"] >= $queues)
+ if (poller_too_much_workers())
return;
- while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
+ $starttime = time();
- if(function_exists('sys_getloadavg')) {
- $load = sys_getloadavg();
- if(intval($load[0]) > $maxsysload) {
- logger('system: load ' . $load[0] . ' too high. poller deferred to next scheduled run.');
- return;
- }
- }
+ while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
- q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d",
+ q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
dbesc(datetime_convert()),
intval(getmypid()),
intval($r[0]["id"]));
+ // Assure that there are no tasks executed twice
+ $id = q("SELECT `id` FROM `workerqueue` WHERE `id` = %d AND `pid` = %d",
+ intval($r[0]["id"]),
+ intval(getmypid()));
+ if (!$id) {
+ logger("Queue item ".$r[0]["id"]." was executed multiple times - skip this execution", LOGGER_DEBUG);
+ continue;
+ }
+
$argv = json_decode($r[0]["parameter"]);
$argc = count($argv);
q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
} else
logger("Function ".$funcname." does not exist");
+
+ // Quit the poller once every hour
+ if (time() > ($starttime + 3600))
+ return;
+
+ // Count active workers and compare them with a maximum value that depends on the load
+ if (poller_too_much_workers())
+ return;
}
}
+function poller_too_much_workers() {
+
+ $queues = get_config("system", "worker_queues");
+
+ if ($queues == 0)
+ $queues = 4;
+
+ $active = poller_active_workers();
+
+ // Decrease the number of workers at higher load
+ if(function_exists('sys_getloadavg')) {
+ $load = max(sys_getloadavg());
+
+ $maxsysload = intval(get_config('system','maxloadavg'));
+ if($maxsysload < 1)
+ $maxsysload = 50;
+
+ $maxworkers = $queues;
+
+ // Some magical mathemathics to reduce the workers
+ $exponent = 3;
+ $slope = $maxworkers / pow($maxsysload, $exponent);
+ $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
+
+ logger("Current load: ".$load." - maximum: ".$maxsysload." - current queues: ".$active." - maximum: ".$queues, LOGGER_DEBUG);
+
+ }
+
+ return($active >= $queues);
+}
+
+function poller_active_workers() {
+ $workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
+
+ return($workers[0]["workers"]);
+}
+
if (array_search(__file__,get_included_files())===0){
poller_run($_SERVER["argv"],$_SERVER["argc"]);
killme();