chdir($directory);
}
+use \Friendica\Core\Config;
+use \Friendica\Core\PConfig;
+
require_once("boot.php");
function poller_run(&$argv, &$argc){
unset($db_host, $db_user, $db_pass, $db_data);
};
- $load = current_load();
- if($load) {
- $maxsysload = intval(get_config('system','maxloadavg'));
- if($maxsysload < 1)
- $maxsysload = 50;
+ if ($a->max_processes_reached())
+ return;
- if(intval($load) > $maxsysload) {
- logger('system: load ' . $load . ' too high. poller deferred to next scheduled run.');
- return;
- }
- }
+ if (poller_max_connections_reached())
+ return;
+
+ if (App::maxload_reached())
+ return;
// Checking the number of workers
- if (poller_too_much_workers(1)) {
+ if (poller_too_much_workers()) {
poller_kill_stale_workers();
return;
}
if(($argc <= 1) OR ($argv[1] != "no_cron")) {
// Run the cron job that calls all other jobs
- proc_run("php","include/cron.php");
+ proc_run(PRIORITY_MEDIUM, "include/cron.php");
// Run the cronhooks job separately from cron for being able to use a different timing
- proc_run("php","include/cronhooks.php");
+ proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
// Cleaning dead processes
poller_kill_stale_workers();
sleep(4);
// Checking number of workers
- if (poller_too_much_workers(2))
+ if (poller_too_much_workers())
return;
+ $cooldown = Config::get("system", "worker_cooldown", 0);
+
$starttime = time();
- while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
+ while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1")) {
+
+ // Constantly check the number of parallel database processes
+ if ($a->max_processes_reached())
+ return;
+
+ // Constantly check the number of available database connections to let the frontend be accessible at any time
+ if (poller_max_connections_reached())
+ return;
// Count active workers and compare them with a maximum value that depends on the load
- if (poller_too_much_workers(3))
+ if (poller_too_much_workers())
return;
q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
require_once($include);
- $funcname=str_replace(".php", "", basename($argv[0]))."_run";
+ $funcname = str_replace(".php", "", basename($argv[0]))."_run";
if (function_exists($funcname)) {
- logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
+ logger("Process ".getmypid()." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
$funcname($argv, $argc);
- logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." - done");
+ if ($cooldown > 0) {
+ logger("Process ".getmypid()." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
+ sleep($cooldown);
+ }
+
+ logger("Process ".getmypid()." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - done");
q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
} else
}
+/**
+ * @brief Checks if the number of database connections has reached a critical limit.
+ *
+ * @return bool Are more than 3/4 of the maximum connections used?
+ */
+function poller_max_connections_reached() {
+
+ // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
+ $max = get_config("system", "max_connections");
+
+ // Fetch the percentage level where the poller will get active
+ $maxlevel = get_config("system", "max_connections_level");
+ if ($maxlevel == 0)
+ $maxlevel = 75;
+
+ if ($max == 0) {
+ // the maximum number of possible user connections can be a system variable
+ $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
+ if ($r)
+ $max = $r[0]["Value"];
+
+ // Or it can be granted. This overrides the system variable
+ $r = q("SHOW GRANTS");
+ if ($r)
+ foreach ($r AS $grants) {
+ $grant = array_pop($grants);
+ if (stristr($grant, "GRANT USAGE ON"))
+ if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
+ $max = $match[1];
+ }
+ }
+
+ // If $max is set we will use the processlist to determine the current number of connections
+ // The processlist only shows entries of the current user
+ if ($max != 0) {
+ $r = q("SHOW PROCESSLIST");
+ if (!$r)
+ return false;
+
+ $used = count($r);
+
+ logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
+
+ $level = ($used / $max) * 100;
+
+ if ($level >= $maxlevel) {
+ logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
+ return true;
+ }
+ }
+
+ // We will now check for the system values.
+ // This limit could be reached although the user limits are fine.
+ $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
+ if (!$r)
+ return false;
+
+ $max = intval($r[0]["Value"]);
+ if ($max == 0)
+ return false;
+
+ $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
+ if (!$r)
+ return false;
+
+ $used = intval($r[0]["Value"]);
+ if ($used == 0)
+ return false;
+
+ logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
+
+ $level = $used / $max * 100;
+
+ if ($level < $maxlevel)
+ return false;
+
+ logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
+ return true;
+}
+
/**
* @brief fix the queue entry if the worker process died
*
*/
function poller_kill_stale_workers() {
$r = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
+
+ if (!dbm::is_result($r)) {
+ // No processing here needed
+ return;
+ }
+
foreach($r AS $pid)
if (!posix_kill($pid["pid"], 0))
q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
}
}
-function poller_too_much_workers($stage) {
+function poller_too_much_workers() {
+
$queues = get_config("system", "worker_queues");
if ($queues == 0)
$queues = 4;
+ $maxqueues = $queues;
+
$active = poller_active_workers();
// Decrease the number of workers at higher load
$slope = $maxworkers / pow($maxsysload, $exponent);
$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
- logger("Current load stage ".$stage.": ".$load." - maximum: ".$maxsysload." - current queues: ".$active." - maximum: ".$queues, LOGGER_DEBUG);
+ $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00'");
+ $entries = $s[0]["total"];
+ if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
+ $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority` LIMIT 1");
+ $top_priority = $s[0]["priority"];
+
+ $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `priority` <= %d AND `executed` != '0000-00-00 00:00:00'",
+ intval($top_priority));
+ $high_running = $s[0]["total"];
+
+ /// @todo define maximum number of fastlanes
+ if (($high_running == 0) AND ($top_priority >= PRIORITY_HIGH) AND ($top_priority < PRIORITY_LOW)) {
+ logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
+ $queues = $active + 1;
+ }
+ }
+
+ logger("Current load: ".$load." - maximum: ".$maxsysload." - current queues: ".$active."/".$entries." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
+
+ // Are there fewer workers running as possible? Then fork a new one.
+ if (!get_config("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
+ logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
+ $args = array("php", "include/poller.php", "no_cron");
+ $a = get_app();
+ $a->proc_run($args);
+ }
}
return($active >= $queues);