X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FCore%2FWorker.php;h=75d4e48740ef60867b179a3da2ac12d97b5c5525;hb=4facd1dfdba93ede48ca40b5e146424e6701118b;hp=3400f00ae1755229a24a20e16fc6844f1c7592c5;hpb=3dfb0c2e7cc84dc7e43a975f44e8854b98d043bc;p=friendica.git

diff --git a/src/Core/Worker.php b/src/Core/Worker.php
index 3400f00ae1..75d4e48740 100644
--- a/src/Core/Worker.php
+++ b/src/Core/Worker.php
@@ -4,13 +4,12 @@
  */
 namespace Friendica\Core;
 
+use Friendica\BaseObject;
 use Friendica\Database\DBA;
 use Friendica\Model\Process;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Network;
 
-require_once 'include/dba.php';
-
 /**
  * @file src/Core/Worker.php
  *
@@ -23,25 +22,32 @@ require_once 'include/dba.php';
 class Worker
 {
 	private static $up_start;
-	private static $db_duration;
+	private static $db_duration = 0;
+	private static $db_duration_count = 0;
+	private static $db_duration_write = 0;
+	private static $db_duration_stat = 0;
+	private static $lock_duration = 0;
 	private static $last_update;
-	private static $lock_duration;
 
 	/**
 	 * @brief Processes the tasks that are in the workerqueue table
 	 *
 	 * @param boolean $run_cron Should the cron processes be executed?
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function processQueue($run_cron = true)
 	{
-		$a = get_app();
+		$a = \get_app();
+
+		// Ensure that all "strtotime" operations do run timezone independent
+		date_default_timezone_set('UTC');
 
 		self::$up_start = microtime(true);
 
 		// At first check the maximum load. We shouldn't continue with a high load
 		if ($a->isMaxLoadReached()) {
-			logger('Pre check: maximum load reached, quitting.', LOGGER_DEBUG);
+			Logger::log('Pre check: maximum load reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
@@ -57,25 +63,25 @@ class Worker
 
 		// Count active workers and compare them with a maximum value that depends on the load
 		if (self::tooMuchWorkers()) {
-			logger('Pre check: Active worker limit reached, quitting.', LOGGER_DEBUG);
+			Logger::log('Pre check: Active worker limit reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
 		// Do we have too few memory?
-		if ($a->min_memory_reached()) {
-			logger('Pre check: Memory limit reached, quitting.', LOGGER_DEBUG);
+		if ($a->isMinMemoryReached()) {
+			Logger::log('Pre check: Memory limit reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
 		// Possibly there are too much database connections
 		if (self::maxConnectionsReached()) {
-			logger('Pre check: maximum connections reached, quitting.', LOGGER_DEBUG);
+			Logger::log('Pre check: maximum connections reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
 		// Possibly there are too much database processes that block the system
 		if ($a->isMaxProcessesReached()) {
-			logger('Pre check: maximum processes reached, quitting.', LOGGER_DEBUG);
+			Logger::log('Pre check: maximum processes reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
@@ -86,8 +92,11 @@ class Worker
 
 		$starttime = time();
 
+		$entries = 0;
+		$deferred = 0;
+
 		// We fetch the next queue entry that is about to be executed
-		while ($r = self::workerProcess($passing_slow)) {
+		while ($r = self::workerProcess($passing_slow, $entries, $deferred)) {
 			// When we are processing jobs with a lower priority, we don't refetch new jobs
 			// Otherwise fast jobs could wait behind slow ones and could be blocked.
 			$refetched = $passing_slow;
@@ -98,42 +107,42 @@ class Worker
 
 				// The work will be done
 				if (!self::execute($entry)) {
-					logger('Process execution failed, quitting.', LOGGER_DEBUG);
+					Logger::log('Process execution failed, quitting.', Logger::DEBUG);
 					return;
 				}
 
 				// If possible we will fetch new jobs for this worker
-				if (!$refetched && Lock::acquire('worker_process', 0)) {
-					$stamp = (float)microtime(true);
-					$refetched = self::findWorkerProcesses($passing_slow);
-					self::$db_duration += (microtime(true) - $stamp);
-					Lock::release('worker_process');
+				if (!$refetched) {
+					$entries = self::totalEntries();
+					$deferred = self::deferredEntries();
+					if (Lock::acquire('worker_process', 0)) {
+						$refetched = self::findWorkerProcesses($passing_slow, $entries, $deferred);
+						Lock::release('worker_process');
+					}
 				}
 			}
 
 			// To avoid the quitting of multiple workers only one worker at a time will execute the check
 			if (Lock::acquire('worker', 0)) {
-				$stamp = (float)microtime(true);
 				// Count active workers and compare them with a maximum value that depends on the load
-				if (self::tooMuchWorkers()) {
-					logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
+				if (self::tooMuchWorkers($entries, $deferred)) {
+					Logger::log('Active worker limit reached, quitting.', Logger::DEBUG);
 					Lock::release('worker');
 					return;
 				}
 
 				// Check free memory
-				if ($a->min_memory_reached()) {
-					logger('Memory limit reached, quitting.', LOGGER_DEBUG);
+				if ($a->isMinMemoryReached()) {
+					Logger::log('Memory limit reached, quitting.', Logger::DEBUG);
 					Lock::release('worker');
 					return;
 				}
 				Lock::release('worker');
-				self::$db_duration += (microtime(true) - $stamp);
 			}
 
 			// Quit the worker once every 5 minutes
 			if (time() > ($starttime + 300)) {
-				logger('Process lifetime reached, quitting.', LOGGER_DEBUG);
+				Logger::log('Process lifetime reached, quitting.', Logger::DEBUG);
 				return;
 			}
 		}
@@ -142,28 +151,65 @@ class Worker
 		if (Config::get('system', 'worker_daemon_mode', false)) {
 			self::IPCSetJobState(false);
 		}
-		logger("Couldn't select a workerqueue entry, quitting process " . getmypid() . ".", LOGGER_DEBUG);
+		Logger::log("Couldn't select a workerqueue entry, quitting process " . getmypid() . ".", Logger::DEBUG);
+	}
+
+	/**
+	 * @brief Check if non executed tasks do exist in the worker queue
+	 *
+	 * @return boolean Returns "true" if tasks are existing
+	 * @throws \Exception
+	 */
+	private static function entriesExists()
+	{
+		$stamp = (float)microtime(true);
+		$exists = DBA::exists('workerqueue', ["NOT `done` AND `pid` = 0 AND `next_try` < ?", DateTimeFormat::utcNow()]);
+		self::$db_duration += (microtime(true) - $stamp);
+		return $exists;
+	}
+
+	/**
+	 * @brief Returns the number of deferred entries in the worker queue
+	 *
+	 * @return integer Number of deferred entries in the worker queue
+	 * @throws \Exception
+	 */
+	private static function deferredEntries()
+	{
+		$stamp = (float)microtime(true);
+		$count = DBA::count('workerqueue', ["NOT `done` AND `pid` = 0 AND `next_try` > ?", DateTimeFormat::utcNow()]);
+		self::$db_duration += (microtime(true) - $stamp);
+		self::$db_duration_count += (microtime(true) - $stamp);
+		return $count;
 	}
 
 	/**
 	 * @brief Returns the number of non executed entries in the worker queue
 	 *
 	 * @return integer Number of non executed entries in the worker queue
+	 * @throws \Exception
 	 */
 	private static function totalEntries()
 	{
-		return DBA::count('workerqueue', ["`executed` <= ? AND NOT `done`", NULL_DATE]);
+		$stamp = (float)microtime(true);
+		$count = DBA::count('workerqueue', ['done' => false, 'pid' => 0]);
+		self::$db_duration += (microtime(true) - $stamp);
+		self::$db_duration_count += (microtime(true) - $stamp);
+		return $count;
 	}
 
 	/**
 	 * @brief Returns the highest priority in the worker queue that isn't executed
 	 *
 	 * @return integer Number of active worker processes
+	 * @throws \Exception
 	 */
 	private static function highestPriority()
 	{
-		$condition = ["`executed` <= ? AND NOT `done`", NULL_DATE];
+		$stamp = (float)microtime(true);
+		$condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
 		$workerqueue = DBA::selectFirst('workerqueue', ['priority'], $condition, ['order' => ['priority']]);
+		self::$db_duration += (microtime(true) - $stamp);
 		if (DBA::isResult($workerqueue)) {
 			return $workerqueue["priority"];
 		} else {
@@ -177,10 +223,11 @@ class Worker
 	 * @param integer $priority The priority that should be checked
 	 *
 	 * @return integer Is there a process running with that priority?
+	 * @throws \Exception
 	 */
 	private static function processWithPriorityActive($priority)
 	{
-		$condition = ["`priority` <= ? AND `executed` > ? AND NOT `done`", $priority, NULL_DATE];
+		$condition = ["`priority` <= ? AND `pid` != 0 AND NOT `done`", $priority];
 		return DBA::exists('workerqueue', $condition);
 	}
 
@@ -190,28 +237,29 @@ class Worker
 	 * @param array $queue Workerqueue entry
 	 *
 	 * @return boolean "true" if further processing should be stopped
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function execute($queue)
 	{
-		$a = get_app();
+		$a = \get_app();
 
 		$mypid = getmypid();
 
 		// Quit when in maintenance
 		if (Config::get('system', 'maintenance', false, true)) {
-			logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
+			Logger::log("Maintenance mode - quit process ".$mypid, Logger::DEBUG);
 			return false;
 		}
 
 		// Constantly check the number of parallel database processes
 		if ($a->isMaxProcessesReached()) {
-			logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
+			Logger::log("Max processes reached for process ".$mypid, Logger::DEBUG);
 			return false;
 		}
 
 		// Constantly check the number of available database connections to let the frontend be accessible at any time
 		if (self::maxConnectionsReached()) {
-			logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
+			Logger::log("Max connection reached for process ".$mypid, Logger::DEBUG);
 			return false;
 		}
 
@@ -233,6 +281,7 @@ class Worker
 				$stamp = (float)microtime(true);
 				DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
+				self::$db_duration_write += (microtime(true) - $stamp);
 			}
 
 			array_shift($argv);
@@ -240,10 +289,12 @@ class Worker
 			self::execFunction($queue, $include, $argv, true);
 
 			$stamp = (float)microtime(true);
-			if (DBA::update('workerqueue', ['done' => true], ['id' => $queue["id"]])) {
+			$condition = ["`id` = ? AND `next_try` < ?", $queue['id'], DateTimeFormat::utcNow()];
+			if (DBA::update('workerqueue', ['done' => true], $condition)) {
 				Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
+			self::$db_duration_write += (microtime(true) - $stamp);
 
 			return true;
 		}
@@ -254,8 +305,11 @@ class Worker
 		}
 
 		if (!validate_include($include)) {
-			logger("Include file ".$argv[0]." is not valid!");
+			Logger::log("Include file ".$argv[0]." is not valid!");
+			$stamp = (float)microtime(true);
 			DBA::delete('workerqueue', ['id' => $queue["id"]]);
+			self::$db_duration = (microtime(true) - $stamp);
+			self::$db_duration_write += (microtime(true) - $stamp);
 			return true;
 		}
 
@@ -276,6 +330,7 @@ class Worker
 				$stamp = (float)microtime(true);
 				DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
+				self::$db_duration_write += (microtime(true) - $stamp);
 			}
 
 			self::execFunction($queue, $funcname, $argv, false);
@@ -285,9 +340,13 @@ class Worker
 				Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
+			self::$db_duration_write += (microtime(true) - $stamp);
 		} else {
-			logger("Function ".$funcname." does not exist");
+			Logger::log("Function ".$funcname." does not exist");
+			$stamp = (float)microtime(true);
 			DBA::delete('workerqueue', ['id' => $queue["id"]]);
+			self::$db_duration = (microtime(true) - $stamp);
+			self::$db_duration_write += (microtime(true) - $stamp);
 		}
 
 		return true;
@@ -301,18 +360,21 @@ class Worker
 	 * @param array   $argv        Array of values to be passed to the function
 	 * @param boolean $method_call boolean
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function execFunction($queue, $funcname, $argv, $method_call)
 	{
-		$a = get_app();
+		$a = \get_app();
 
 		$mypid = getmypid();
 
 		$argc = count($argv);
 
-		$new_process_id = System::processID("wrk");
+		// Currently deactivated, since the new logger doesn't support this
+		//$new_process_id = System::processID("wrk");
+		$new_process_id = '';
 
-		logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]." - Process PID: ".$new_process_id);
+		Logger::log("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]." - Process PID: ".$new_process_id);
 
 		$stamp = (float)microtime(true);
 
@@ -339,7 +401,7 @@ class Worker
 		$a->process_id = $new_process_id;
 		$a->queue = $queue;
 
-		$up_duration = number_format(microtime(true) - self::$up_start, 3);
+		$up_duration = microtime(true) - self::$up_start;
 
 		// Reset global data to avoid interferences
 		unset($_SESSION);
@@ -355,34 +417,40 @@ class Worker
 
 		$duration = (microtime(true) - $stamp);
 
-		self::$up_start = microtime(true);
-
 		/* With these values we can analyze how effective the worker is.
 		 * The database and rest time should be low since this is the unproductive time.
 		 * The execution time is the productive time.
 		 * By changing parameters like the maximum number of workers we can check the effectivness.
 		*/
-		logger(
-			'DB: '.number_format(self::$db_duration, 2).
-			' - Lock: '.number_format(self::$lock_duration, 2).
-			' - Rest: '.number_format($up_duration - self::$db_duration - self::$lock_duration, 2).
-			' - Execution: '.number_format($duration, 2),
-			LOGGER_DEBUG
+		Logger::log(
+			'DB: '.number_format(self::$db_duration - (self::$db_duration_count + self::$db_duration_write + self::$db_duration_stat), 4).
+			' - DB-Count: '.number_format(self::$db_duration_count, 4).
+			' - DB-Stat: '.number_format(self::$db_duration_stat, 4).
+			' - DB-Write: '.number_format(self::$db_duration_write, 4).
+			' - Lock: '.number_format(self::$lock_duration, 4).
+			' - Rest: '.number_format(max(0, $up_duration - (self::$db_duration + self::$lock_duration)), 4).
+			' - Execution: '.number_format($duration, 4),
+			Logger::DEBUG
 		);
 
+		self::$up_start = microtime(true);
+		self::$db_duration = 0;
+		self::$db_duration_count = 0;
+		self::$db_duration_stat = 0;
+		self::$db_duration_write = 0;
 		self::$lock_duration = 0;
 
 		if ($duration > 3600) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", Logger::DEBUG);
 		} elseif ($duration > 600) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", Logger::DEBUG);
 		} elseif ($duration > 300) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", Logger::DEBUG);
 		} elseif ($duration > 120) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", Logger::DEBUG);
 		}
 
-		logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds. Process PID: ".$new_process_id);
+		Logger::log("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".number_format($duration, 4)." seconds. Process PID: ".$new_process_id);
 
 		// Write down the performance values into the log
 		if (Config::get("system", "profiler")) {
@@ -437,7 +505,7 @@ class Worker
 				}
 			}
 
-			logger(
+			Logger::log(
 				"ID ".$queue["id"].": ".$funcname.": ".sprintf(
 					"DB: %s/%s, Cache: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 					number_format($a->performance["database"] - $a->performance["database_write"], 2),
@@ -451,14 +519,14 @@ class Worker
 						+ $a->performance["network"] + $a->performance["file"]), 2),
 					number_format($duration, 2)
 				),
-				LOGGER_DEBUG
+				Logger::DEBUG
 			);
 		}
 
 		$cooldown = Config::get("system", "worker_cooldown", 0);
 
 		if ($cooldown > 0) {
-			logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
+			Logger::log("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 			sleep($cooldown);
 		}
 	}
@@ -467,6 +535,7 @@ class Worker
 	 * @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?
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function maxConnectionsReached()
 	{
@@ -483,7 +552,9 @@ class Worker
 				$max = $r["Value"];
 			}
 			// Or it can be granted. This overrides the system variable
+			$stamp = (float)microtime(true);
 			$r = DBA::p('SHOW GRANTS');
+			self::$db_duration += (microtime(true) - $stamp);
 			while ($grants = DBA::fetch($r)) {
 				$grant = array_pop($grants);
 				if (stristr($grant, "GRANT USAGE ON")) {
@@ -498,16 +569,18 @@ class Worker
 		// 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) {
+			$stamp = (float)microtime(true);
 			$r = DBA::p('SHOW PROCESSLIST');
+			self::$db_duration += (microtime(true) - $stamp);
 			$used = DBA::numRows($r);
 			DBA::close($r);
 
-			logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
+			Logger::log("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);
+				Logger::log("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 				return true;
 			}
 		}
@@ -530,37 +603,43 @@ class Worker
 		if ($used == 0) {
 			return false;
 		}
-		logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
+		Logger::log("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);
+		Logger::log("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 		return true;
 	}
 
 	/**
 	 * @brief fix the queue entry if the worker process died
 	 * @return void
+	 * @throws \Exception
 	 */
 	private static function killStaleWorkers()
 	{
+		$stamp = (float)microtime(true);
 		$entries = DBA::select(
 			'workerqueue',
 			['id', 'pid', 'executed', 'priority', 'parameter'],
-			['`executed` > ? AND NOT `done` AND `pid` != 0', NULL_DATE],
+			['NOT `done` AND `pid` != 0'],
 			['order' => ['priority', 'created']]
 		);
+		self::$db_duration += (microtime(true) - $stamp);
 
 		while ($entry = DBA::fetch($entries)) {
 			if (!posix_kill($entry["pid"], 0)) {
+				$stamp = (float)microtime(true);
 				DBA::update(
 					'workerqueue',
-					['executed' => NULL_DATE, 'pid' => 0],
+					['executed' => DBA::NULL_DATETIME, 'pid' => 0],
 					['id' => $entry["id"]]
 				);
+				self::$db_duration += (microtime(true) - $stamp);
+				self::$db_duration_write += (microtime(true) - $stamp);
 			} else {
 				// Kill long running processes
 				// Check if the priority is in a valid range
@@ -578,7 +657,7 @@ class Worker
 				// How long is the process already running?
 				$duration = (time() - strtotime($entry["executed"])) / 60;
 				if ($duration > $max_duration) {
-					logger("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") took more than ".$max_duration." minutes. It will be killed now.");
+					Logger::log("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") took more than ".$max_duration." minutes. It will be killed now.");
 					posix_kill($entry["pid"], SIGTERM);
 
 					// We killed the stale process.
@@ -592,13 +671,16 @@ class Worker
 					} elseif ($entry["priority"] != PRIORITY_CRITICAL) {
 						$new_priority = PRIORITY_NEGLIGIBLE;
 					}
+					$stamp = (float)microtime(true);
 					DBA::update(
 						'workerqueue',
-						['executed' => NULL_DATE, 'created' => DateTimeFormat::utcNow(), 'priority' => $new_priority, 'pid' => 0],
+						['executed' => DBA::NULL_DATETIME, 'created' => DateTimeFormat::utcNow(), 'priority' => $new_priority, 'pid' => 0],
 						['id' => $entry["id"]]
 					);
+					self::$db_duration += (microtime(true) - $stamp);
+					self::$db_duration_write += (microtime(true) - $stamp);
 				} else {
-					logger("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
+					Logger::log("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", Logger::DEBUG);
 				}
 			}
 		}
@@ -607,9 +689,13 @@ class Worker
 	/**
 	 * @brief Checks if the number of active workers exceeds the given limits
 	 *
+	 * @param integer $entries Total number of queue entries
+	 * @param integer $deferred Number of deferred queue entries
+	 *
 	 * @return bool Are there too much workers running?
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	public static function tooMuchWorkers()
+	public static function tooMuchWorkers($entries = 0, $deferred = 0)
 	{
 		$queues = Config::get("system", "worker_queues", 4);
 
@@ -618,7 +704,7 @@ class Worker
 		$active = self::activeWorkers();
 
 		// Decrease the number of workers at higher load
-		$load = current_load();
+		$load = System::currentLoad();
 		if ($load) {
 			$maxsysload = intval(Config::get("system", "maxloadavg", 50));
 
@@ -633,63 +719,91 @@ class Worker
 
 			$processlist = '';
 
-			if (Config::get('system', 'worker_debug')) {
-				// Create a list of queue entries grouped by their priority
-				$listitem = [];
-
-				// Adding all processes with no workerqueue entry
-				$processes = DBA::p(
-					"SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS
-							(SELECT id FROM `workerqueue`
-							WHERE `workerqueue`.`pid` = `process`.`pid` AND NOT `done` AND `pid` != ?)",
-					getmypid()
-				);
+			if (Config::get('system', 'worker_jpm')) {
+				$intervals = explode(',', Config::get('system', 'worker_jpm_range'));
+				$jobs_per_minute = [];
+				foreach ($intervals as $interval) {
+					if ($interval == 0) {
+						continue;
+					} else {
+						$interval = (int)$interval;
+					}
 
-				if ($process = DBA::fetch($processes)) {
-					$listitem[0] = "0:".$process["running"];
+					$stamp = (float)microtime(true);
+					$jobs = DBA::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ? MINUTE", $interval);
+					self::$db_duration += (microtime(true) - $stamp);
+					self::$db_duration_stat += (microtime(true) - $stamp);
+					if ($job = DBA::fetch($jobs)) {
+						$jobs_per_minute[$interval] = number_format($job['jobs'] / $interval, 0);
+					}
+					DBA::close($jobs);
 				}
-				DBA::close($processes);
+				$processlist = ' - jpm: '.implode('/', $jobs_per_minute);
+			}
+
+			// Create a list of queue entries grouped by their priority
+			$listitem = [0 => ''];
+
+			$idle_workers = $active;
+
+			if (empty($deferred) && empty($entries)) {
+				$deferred = self::deferredEntries();
+				$entries = max(self::totalEntries() - $deferred, 0);
+			}
+
+			$waiting_processes = max(0, $entries - $deferred);
 
+			if (Config::get('system', 'worker_debug')) {
+				$waiting_processes = 0;
 				// Now adding all processes with workerqueue entries
-				$entries = DBA::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
-				while ($entry = DBA::fetch($entries)) {
-					$processes = DBA::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` WHERE `priority` = ?", $entry["priority"]);
+				$stamp = (float)microtime(true);
+				$jobs = DBA::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` AND `next_try` < ? GROUP BY `priority`", DateTimeFormat::utcNow());
+				self::$db_duration += (microtime(true) - $stamp);
+				self::$db_duration_stat += (microtime(true) - $stamp);
+				while ($entry = DBA::fetch($jobs)) {
+					$stamp = (float)microtime(true);
+					$processes = DBA::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` WHERE NOT `done` AND `priority` = ?", $entry["priority"]);
+					self::$db_duration += (microtime(true) - $stamp);
+					self::$db_duration_stat += (microtime(true) - $stamp);
 					if ($process = DBA::fetch($processes)) {
+						$idle_workers -= $process["running"];
+						$waiting_processes += $entry["entries"];
 						$listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 					}
 					DBA::close($processes);
 				}
-				DBA::close($entries);
+				DBA::close($jobs);
+			} else {
+				$stamp = (float)microtime(true);
+				$jobs = DBA::p("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` GROUP BY `priority` ORDER BY `priority`");
+				self::$db_duration += (microtime(true) - $stamp);
 
-				$intervals = [1, 10, 60];
-				$jobs_per_minute = [];
-				foreach ($intervals as $interval) {
-					$jobs = DBA::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ".intval($interval)." MINUTE");
-					if ($job = DBA::fetch($jobs)) {
-						$jobs_per_minute[$interval] = number_format($job['jobs'] / $interval, 0);
-					}
-					DBA::close($jobs);
+				while ($entry = DBA::fetch($jobs)) {
+					$idle_workers -= $entry["running"];
+					$listitem[$entry["priority"]] = $entry["priority"].":".$entry["running"];
 				}
-				$processlist = ' - jpm: '.implode('/', $jobs_per_minute).' ('.implode(', ', $listitem).')';
+				DBA::close($jobs);
 			}
 
-			$entries = self::totalEntries();
+			$listitem[0] = "0:" . max(0, $idle_workers);
 
-			if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && ($entries > 0) && ($active >= $queues)) {
+			$processlist .= ' ('.implode(', ', $listitem).')';
+
+			if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && self::entriesExists() && ($active >= $queues)) {
 				$top_priority = self::highestPriority();
 				$high_running = self::processWithPriorityActive($top_priority);
 
 				if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
-					logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
+					Logger::log("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", Logger::DEBUG);
 					$queues = $active + 1;
 				}
 			}
 
-			logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
+			Logger::log("Load: " . $load ."/" . $maxsysload . " - processes: " . $deferred . "/" . $active . "/" . $waiting_processes . $processlist . " - maximum: " . $queues . "/" . $maxqueues, Logger::DEBUG);
 
 			// Are there fewer workers running as possible? Then fork a new one.
 			if (!Config::get("system", "worker_dont_fork", false) && ($queues > ($active + 1)) && ($entries > 1)) {
-				logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
+				Logger::log("Active workers: ".$active."/".$queues." Fork a new worker.", Logger::DEBUG);
 				if (Config::get('system', 'worker_daemon_mode', false)) {
 					self::IPCSetJobState(true);
 				} else {
@@ -710,10 +824,14 @@ class Worker
 	 * @brief Returns the number of active worker processes
 	 *
 	 * @return integer Number of active worker processes
+	 * @throws \Exception
 	 */
 	private static function activeWorkers()
 	{
-		return DBA::count('process', ['command' => 'Worker.php']);
+		$stamp = (float)microtime(true);
+		$count = DBA::count('process', ['command' => 'Worker.php']);
+		self::$db_duration += (microtime(true) - $stamp);
+		return $count;
 	}
 
 	/**
@@ -724,16 +842,19 @@ class Worker
 	 *
 	 * @param string $highest_priority Returns the currently highest priority
 	 * @return bool We let pass a slower process than $highest_priority
+	 * @throws \Exception
 	 */
 	private static function passingSlow(&$highest_priority)
 	{
 		$highest_priority = 0;
 
+		$stamp = (float)microtime(true);
 		$r = DBA::p(
 			"SELECT `priority`
 				FROM `process`
 				INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done`"
 		);
+		self::$db_duration += (microtime(true) - $stamp);
 
 		// No active processes at all? Fine
 		if (!DBA::isResult($r)) {
@@ -762,11 +883,11 @@ class Worker
 				++$high;
 			}
 		}
-		logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
+		Logger::log("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, Logger::DEBUG);
 		$passing_slow = (($high/count($priorities)) > (2/3));
 
 		if ($passing_slow) {
-			logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
+			Logger::log("Passing slower processes than priority ".$highest_priority, Logger::DEBUG);
 		}
 		return $passing_slow;
 	}
@@ -775,9 +896,12 @@ class Worker
 	 * @brief Find and claim the next worker process for us
 	 *
 	 * @param boolean $passing_slow Returns if we had passed low priority processes
+	 * @param integer $entries Total number of queue entries
+	 * @param integer $deferred Number of deferred queue entries
 	 * @return boolean Have we found something?
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	private static function findWorkerProcesses(&$passing_slow)
+	private static function findWorkerProcesses(&$passing_slow, $entries, $deferred)
 	{
 		$mypid = getmypid();
 
@@ -791,23 +915,26 @@ class Worker
 		$worker_queues = Config::get("system", "worker_queues", 4);
 		$queue_length = Config::get('system', 'worker_fetch_limit', 1);
 		$lower_job_limit = $worker_queues * $queue_length * 2;
-		$jobs = self::totalEntries();
+		$entries = max($entries - $deferred, 0);
 
 		// Now do some magic
 		$exponent = 2;
 		$slope = $queue_length / pow($lower_job_limit, $exponent);
-		$limit = min($queue_length, ceil($slope * pow($jobs, $exponent)));
+		$limit = min($queue_length, ceil($slope * pow($entries, $exponent)));
 
-		logger('Total: '.$jobs.' - Maximum: '.$queue_length.' - jobs per queue: '.$limit, LOGGER_DEBUG);
+		Logger::log('Deferred: ' . $deferred . ' - Total: ' . $entries . ' - Maximum: ' . $queue_length . ' - jobs per queue: ' . $limit, Logger::DEBUG);
 		$ids = [];
 		if (self::passingSlow($highest_priority)) {
 			// Are there waiting processes with a higher priority than the currently highest?
+			$stamp = (float)microtime(true);
 			$result = DBA::select(
 				'workerqueue',
 				['id'],
-				["`executed` <= ? AND `priority` < ? AND NOT `done`", NULL_DATE, $highest_priority],
-				['limit' => $limit, 'order' => ['priority', 'created']]
+				["`pid` = 0 AND `priority` < ? AND NOT `done` AND `next_try` < ?",
+				$highest_priority, DateTimeFormat::utcNow()],
+				['limit' => 1, 'order' => ['priority', 'created']]
 			);
+			self::$db_duration += (microtime(true) - $stamp);
 
 			while ($id = DBA::fetch($result)) {
 				$ids[] = $id["id"];
@@ -818,12 +945,15 @@ class Worker
 
 			if (!$found) {
 				// Give slower processes some processing time
+				$stamp = (float)microtime(true);
 				$result = DBA::select(
 					'workerqueue',
 					['id'],
-					["`executed` <= ? AND `priority` > ? AND NOT `done`", NULL_DATE, $highest_priority],
-					['limit' => $limit, 'order' => ['priority', 'created']]
+					["`pid` = 0 AND `priority` > ? AND NOT `done` AND `next_try` < ?",
+					$highest_priority, DateTimeFormat::utcNow()],
+					['limit' => 1, 'order' => ['priority', 'created']]
 				);
+				self::$db_duration += (microtime(true) - $stamp);
 
 				while ($id = DBA::fetch($result)) {
 					$ids[] = $id["id"];
@@ -835,14 +965,37 @@ class Worker
 			}
 		}
 
+		// At first try to fetch a bunch of high or medium tasks
+		if (!$found && ($limit > 1)) {
+			$stamp = (float)microtime(true);
+			$result = DBA::select(
+				'workerqueue',
+				['id'],
+				["`pid` = 0 AND NOT `done` AND `priority` <= ? AND `next_try` < ? AND `retrial` = 0",
+				PRIORITY_MEDIUM, DateTimeFormat::utcNow()],
+				['limit' => $limit, 'order' => ['created']]
+			);
+			self::$db_duration += (microtime(true) - $stamp);
+
+			while ($id = DBA::fetch($result)) {
+				$ids[] = $id["id"];
+			}
+			DBA::close($result);
+
+			$found = (count($ids) > 0);
+		}
+
 		// If there is no result (or we shouldn't pass lower processes) we check without priority limit
 		if (!$found) {
+			$stamp = (float)microtime(true);
 			$result = DBA::select(
 				'workerqueue',
 				['id'],
-				["`executed` <= ? AND NOT `done`", NULL_DATE],
-				['limit' => $limit, 'order' => ['priority', 'created']]
+				["`pid` = 0 AND NOT `done` AND `next_try` < ?",
+				DateTimeFormat::utcNow()],
+				['limit' => 1, 'order' => ['priority', 'created']]
 			);
+			self::$db_duration += (microtime(true) - $stamp);
 
 			while ($id = DBA::fetch($result)) {
 				$ids[] = $id["id"];
@@ -853,9 +1006,12 @@ class Worker
 		}
 
 		if ($found) {
+			$stamp = (float)microtime(true);
 			$condition = "`id` IN (".substr(str_repeat("?, ", count($ids)), 0, -2).") AND `pid` = 0 AND NOT `done`";
 			array_unshift($ids, $condition);
 			DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $mypid], $ids);
+			self::$db_duration += (microtime(true) - $stamp);
+			self::$db_duration_write += (microtime(true) - $stamp);
 		}
 
 		return $found;
@@ -865,34 +1021,41 @@ class Worker
 	 * @brief Returns the next worker process
 	 *
 	 * @param boolean $passing_slow Returns if we had passed low priority processes
+	 * @param integer $entries Returns total number of queue entries
+	 * @param integer $deferred Returns number of deferred queue entries
+	 *
 	 * @return string SQL statement
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	public static function workerProcess(&$passing_slow)
+	public static function workerProcess(&$passing_slow, &$entries, &$deferred)
 	{
-		$stamp = (float)microtime(true);
-
 		// There can already be jobs for us in the queue.
+		$stamp = (float)microtime(true);
 		$r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
+		self::$db_duration += (microtime(true) - $stamp);
 		if (DBA::isResult($r)) {
-			self::$db_duration += (microtime(true) - $stamp);
 			return DBA::toArray($r);
 		}
 		DBA::close($r);
 
+		// Counting the rows outside the lock reduces the lock time
+		$entries = self::totalEntries();
+		$deferred = self::deferredEntries();
+
 		$stamp = (float)microtime(true);
 		if (!Lock::acquire('worker_process')) {
 			return false;
 		}
-		self::$lock_duration = (microtime(true) - $stamp);
+		self::$lock_duration += (microtime(true) - $stamp);
 
-		$stamp = (float)microtime(true);
-		$found = self::findWorkerProcesses($passing_slow);
-		self::$db_duration += (microtime(true) - $stamp);
+		$found = self::findWorkerProcesses($passing_slow, $entries, $deferred);
 
 		Lock::release('worker_process');
 
 		if ($found) {
+			$stamp = (float)microtime(true);
 			$r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
+			self::$db_duration += (microtime(true) - $stamp);
 			return DBA::toArray($r);
 		}
 		return false;
@@ -901,17 +1064,22 @@ class Worker
 	/**
 	 * @brief Removes a workerqueue entry from the current process
 	 * @return void
+	 * @throws \Exception
 	 */
 	public static function unclaimProcess()
 	{
 		$mypid = getmypid();
 
-		DBA::update('workerqueue', ['executed' => NULL_DATE, 'pid' => 0], ['pid' => $mypid, 'done' => false]);
+		$stamp = (float)microtime(true);
+		DBA::update('workerqueue', ['executed' => DBA::NULL_DATETIME, 'pid' => 0], ['pid' => $mypid, 'done' => false]);
+		self::$db_duration += (microtime(true) - $stamp);
+		self::$db_duration_write += (microtime(true) - $stamp);
 	}
 
 	/**
 	 * @brief Call the front end worker
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function callWorker()
 	{
@@ -926,6 +1094,7 @@ class Worker
 	/**
 	 * @brief Call the front end worker if there aren't any active
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function executeIfIdle()
 	{
@@ -954,7 +1123,7 @@ class Worker
 
 			self::runCron();
 
-			logger('Call worker', LOGGER_DEBUG);
+			Logger::log('Call worker', Logger::DEBUG);
 			self::spawnWorker();
 			return;
 		}
@@ -976,30 +1145,35 @@ class Worker
 	/**
 	 * @brief Removes long running worker processes
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function clearProcesses()
 	{
 		$timeout = Config::get("system", "frontend_worker_timeout", 10);
 
 		/// @todo We should clean up the corresponding workerqueue entries as well
+		$stamp = (float)microtime(true);
 		$condition = ["`created` < ? AND `command` = 'worker.php'",
 				DateTimeFormat::utc("now - ".$timeout." minutes")];
 		DBA::delete('process', $condition);
+		self::$db_duration = (microtime(true) - $stamp);
+		self::$db_duration_write += (microtime(true) - $stamp);
 	}
 
 	/**
 	 * @brief Runs the cron processes
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function runCron()
 	{
-		logger('Add cron entries', LOGGER_DEBUG);
+		Logger::log('Add cron entries', Logger::DEBUG);
 
 		// Check for spooled items
-		self::add(PRIORITY_HIGH, "SpoolPost");
+		self::add(['priority' => PRIORITY_HIGH, 'force_priority' => true], 'SpoolPost');
 
 		// Run the cron job that calls all other jobs
-		self::add(PRIORITY_MEDIUM, "Cron");
+		self::add(['priority' => PRIORITY_MEDIUM, 'force_priority' => true], 'Cron');
 
 		// Cleaning dead processes
 		self::killStaleWorkers();
@@ -1007,7 +1181,9 @@ class Worker
 
 	/**
 	 * @brief Spawns a new worker
+	 * @param bool $do_cron
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function spawnWorker($do_cron = false)
 	{
@@ -1032,12 +1208,13 @@ class Worker
 	 * or: Worker::add(PRIORITY_HIGH, "Notifier", "drop", $drop_id);
 	 * or: Worker::add(array('priority' => PRIORITY_HIGH, 'dont_fork' => true), "CreateShadowEntry", $post_id);
 	 *
+	 * @return boolean "false" if proc_run couldn't be executed
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @note $cmd and string args are surrounded with ""
 	 *
 	 * @hooks 'proc_run'
-	 * 	array $arr
+	 *    array $arr
 	 *
-	 * @return boolean "false" if proc_run couldn't be executed
 	 */
 	public static function add($cmd)
 	{
@@ -1049,7 +1226,7 @@ class Worker
 
 		$arr = ['args' => $args, 'run_cmd' => true];
 
-		Addon::callHooks("proc_run", $arr);
+		Hook::callAll("proc_run", $arr);
 		if (!$arr['run_cmd'] || !count($args)) {
 			return true;
 		}
@@ -1057,6 +1234,7 @@ class Worker
 		$priority = PRIORITY_MEDIUM;
 		$dont_fork = Config::get("system", "worker_dont_fork", false);
 		$created = DateTimeFormat::utcNow();
+		$force_priority = false;
 
 		$run_parameter = array_shift($args);
 
@@ -1072,6 +1250,9 @@ class Worker
 			if (isset($run_parameter['dont_fork'])) {
 				$dont_fork = $run_parameter['dont_fork'];
 			}
+			if (isset($run_parameter['force_priority'])) {
+				$force_priority = $run_parameter['force_priority'];
+			}
 		}
 
 		$parameters = json_encode($args);
@@ -1084,6 +1265,8 @@ class Worker
 
 		if (!$found) {
 			DBA::insert('workerqueue', ['parameter' => $parameters, 'created' => $created, 'priority' => $priority]);
+		} elseif ($force_priority) {
+			DBA::update('workerqueue', ['priority' => $priority], ['parameter' => $parameters, 'done' => false, 'pid' => 0]);
 		}
 
 		// Should we quit and wait for the worker to be called as a cronjob?
@@ -1116,6 +1299,47 @@ class Worker
 		return true;
 	}
 
+	/**
+	 * Defers the current worker entry
+	 */
+	public static function defer()
+	{
+		if (empty(BaseObject::getApp()->queue)) {
+			return;
+		}
+
+		$queue = BaseObject::getApp()->queue;
+
+		$retrial = $queue['retrial'];
+		$id = $queue['id'];
+		$priority = $queue['priority'];
+
+		if ($retrial > 14) {
+			Logger::log('Id ' . $id . ' had been tried 14 times. We stop now.', Logger::DEBUG);
+			return;
+		}
+
+		// Calculate the delay until the next trial
+		$delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
+		$next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
+
+		if (($priority < PRIORITY_MEDIUM) && ($retrial > 2)) {
+			$priority = PRIORITY_MEDIUM;
+		} elseif (($priority < PRIORITY_LOW) && ($retrial > 5)) {
+			$priority = PRIORITY_LOW;
+		} elseif (($priority < PRIORITY_NEGLIGIBLE) && ($retrial > 7)) {
+			$priority = PRIORITY_NEGLIGIBLE;
+		}
+
+		Logger::log('Defer execution ' . $retrial . ' of id ' . $id . ' to ' . $next . ' - priority old/new: ' . $queue['priority'] . '/' . $priority, Logger::DEBUG);
+
+		$stamp = (float)microtime(true);
+		$fields = ['retrial' => $retrial + 1, 'next_try' => $next, 'executed' => DBA::NULL_DATETIME, 'pid' => 0, 'priority' => $priority];
+		DBA::update('workerqueue', $fields, ['id' => $id]);
+		self::$db_duration += (microtime(true) - $stamp);
+		self::$db_duration_write += (microtime(true) - $stamp);
+	}
+
 	/**
 	 * Log active processes into the "process" table
 	 *
@@ -1137,6 +1361,7 @@ class Worker
 	 *
 	 * @brief Remove the active process from the "process" table
 	 * @return bool
+	 * @throws \Exception
 	 */
 	public static function endProcess()
 	{
@@ -1148,10 +1373,14 @@ class Worker
 	 *
 	 * @brief Set the flag if some job is waiting
 	 * @param boolean $jobs Is there a waiting job?
+	 * @throws \Exception
 	 */
 	public static function IPCSetJobState($jobs)
 	{
+		$stamp = (float)microtime(true);
 		DBA::update('worker-ipc', ['jobs' => $jobs], ['key' => 1], true);
+		self::$db_duration += (microtime(true) - $stamp);
+		self::$db_duration_write += (microtime(true) - $stamp);
 	}
 
 	/**
@@ -1159,10 +1388,13 @@ class Worker
 	 *
 	 * @brief Checks if some worker job waits to be executed
 	 * @return bool
+	 * @throws \Exception
 	 */
 	public static function IPCJobsExists()
 	{
+		$stamp = (float)microtime(true);
 		$row = DBA::selectFirst('worker-ipc', ['jobs'], ['key' => 1]);
+		self::$db_duration += (microtime(true) - $stamp);
 
 		// When we don't have a row, no job is running
 		if (!DBA::isResult($row)) {