The number of workers per priority is now calculated dynamically
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Michael
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0845089a0f
commit
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@ -834,64 +834,6 @@ class Worker
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return $count;
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}
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/**
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* @brief Check if we should pass some slow processes
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*
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* When the active processes of the highest priority are using more than 2/3
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* of all processes, we let pass slower processes.
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*
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* @param string $highest_priority Returns the currently highest priority
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* @return bool We let pass a slower process than $highest_priority
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* @throws \Exception
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*/
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private static function passingSlow(&$highest_priority)
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{
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$highest_priority = 0;
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$stamp = (float)microtime(true);
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$r = DBA::p(
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"SELECT `priority`
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FROM `process`
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INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done`"
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);
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self::$db_duration += (microtime(true) - $stamp);
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// No active processes at all? Fine
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if (!DBA::isResult($r)) {
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return false;
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}
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$priorities = [];
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while ($line = DBA::fetch($r)) {
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$priorities[] = $line["priority"];
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}
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DBA::close($r);
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// Should not happen
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if (count($priorities) == 0) {
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return false;
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}
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$highest_priority = min($priorities);
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// The highest process is already the slowest one?
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// Then we quit
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if ($highest_priority == PRIORITY_NEGLIGIBLE) {
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return false;
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}
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$high = 0;
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foreach ($priorities as $priority) {
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if ($priority == $highest_priority) {
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++$high;
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}
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}
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Logger::log("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, Logger::DEBUG);
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$passing_slow = (($high/count($priorities)) > (2/3));
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if ($passing_slow) {
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Logger::log("Passing slower processes than priority ".$highest_priority, Logger::DEBUG);
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}
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return $passing_slow;
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}
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public static function nextProcess()
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{
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$priority = self::nextPriority();
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@ -937,6 +879,7 @@ class Worker
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}
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$running = [];
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$running_total = 0;
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$stamp = (float)microtime(true);
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$processes = DBA::p("SELECT COUNT(DISTINCT(`process`.`pid`)) AS `running`, `priority` FROM `process`
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INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`
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@ -944,28 +887,43 @@ class Worker
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self::$db_duration += (microtime(true) - $stamp);
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while ($process = DBA::fetch($processes)) {
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$running[$process['priority']] = $process['running'];
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$running_total += $process['running'];
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}
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DBA::close($processes);
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$active = self::activeWorkers();
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foreach ($priorities as $priority) {
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if (!empty($waiting[$priority]) && empty($running[$priority])) {
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Logger::log('No running worker found with priority ' . $priority . ' - assigning it.', Logger::DEBUG);
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return $priority;
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}
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}
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// Temp
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if (!empty($running[PRIORITY_LOW]) && ($running[PRIORITY_LOW] < 3)) {
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return PRIORITY_LOW;
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$active = max(self::activeWorkers(), $running_total);
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$priorities = max(count($waiting), count($running));
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$exponent = 2;
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$total = 0;
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for ($i = 1; $i <= $priorities; ++$i) {
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$total += pow($i, $exponent);
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}
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if (!empty($running[PRIORITY_NEGLIGIBLE]) && ($running[PRIORITY_NEGLIGIBLE] < 2)) {
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return PRIORITY_NEGLIGIBLE;
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$limit = [];
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for ($i = 1; $i <= $priorities; ++$i) {
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$limit[$priorities - $i] = max(1, round($active * (pow($i, $exponent) / $total)));
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}
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$i = 0;
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foreach ($running as $priority => $workers) {
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if ($workers < $limit[$i++]) {
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Logger::log('Priority ' . $priority . ' has got ' . $workers . ' workers out of a limit of ' . $limit[$i - 1], Logger::DEBUG);
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return $priority;
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}
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}
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if (!empty($waiting)) {
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return array_shift(array_keys($waiting));
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$priority = array_shift(array_keys($waiting));
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Logger::log('No underassigned priority found, now taking the highest priority (' . $priority . ').', Logger::DEBUG);
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return $priority;
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}
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return false;
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@ -984,89 +942,11 @@ class Worker
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{
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$mypid = getmypid();
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// Check if we should pass some low priority process
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$highest_priority = 0;
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$found = false;
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$passing_slow = false;
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// The higher the number of parallel workers, the more we prefetch to prevent concurring access
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// We decrease the limit with the number of entries left in the queue
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$worker_queues = Config::get("system", "worker_queues", 4);
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$queue_length = Config::get('system', 'worker_fetch_limit', 1);
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$lower_job_limit = $worker_queues * $queue_length * 2;
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$entries = max($entries - $deferred, 0);
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// Now do some magic
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$exponent = 2;
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$slope = $queue_length / pow($lower_job_limit, $exponent);
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$limit = min($queue_length, ceil($slope * pow($entries, $exponent)));
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Logger::log('Deferred: ' . $deferred . ' - Total: ' . $entries . ' - Maximum: ' . $queue_length . ' - jobs per queue: ' . $limit, Logger::DEBUG);
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$ids = self::nextProcess();
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$found = (count($ids) > 0);
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if (!$found && self::passingSlow($highest_priority)) {
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// Are there waiting processes with a higher priority than the currently highest?
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$stamp = (float)microtime(true);
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$result = DBA::select(
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'workerqueue',
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['id'],
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["`pid` = 0 AND `priority` < ? AND NOT `done` AND `next_try` < ?",
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$highest_priority, DateTimeFormat::utcNow()],
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['limit' => 1, 'order' => ['priority', 'created']]
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);
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self::$db_duration += (microtime(true) - $stamp);
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while ($id = DBA::fetch($result)) {
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$ids[] = $id["id"];
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}
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DBA::close($result);
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$found = (count($ids) > 0);
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if (!$found) {
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// Give slower processes some processing time
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$stamp = (float)microtime(true);
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$result = DBA::select(
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'workerqueue',
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['id'],
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["`pid` = 0 AND `priority` > ? AND NOT `done` AND `next_try` < ?",
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$highest_priority, DateTimeFormat::utcNow()],
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['limit' => 1, 'order' => ['priority', 'created']]
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);
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self::$db_duration += (microtime(true) - $stamp);
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while ($id = DBA::fetch($result)) {
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$ids[] = $id["id"];
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}
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DBA::close($result);
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$found = (count($ids) > 0);
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$passing_slow = $found;
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}
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}
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// At first try to fetch a bunch of high or medium tasks
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if (!$found && ($limit > 1)) {
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$stamp = (float)microtime(true);
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$result = DBA::select(
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'workerqueue',
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['id'],
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["`pid` = 0 AND NOT `done` AND `priority` <= ? AND `next_try` < ? AND `retrial` = 0",
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PRIORITY_MEDIUM, DateTimeFormat::utcNow()],
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['limit' => $limit, 'order' => ['created']]
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);
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self::$db_duration += (microtime(true) - $stamp);
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while ($id = DBA::fetch($result)) {
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$ids[] = $id["id"];
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}
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DBA::close($result);
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$found = (count($ids) > 0);
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}
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// If there is no result (or we shouldn't pass lower processes) we check without priority limit
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if (!$found) {
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$stamp = (float)microtime(true);
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