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Semaphore based locking and hopefully the fix for the workerqueue

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This commit is contained in:
Michael
2017-06-28 04:53:11 +00:00
parent 7097673fa1
commit 4515c36f69
7 changed files with 102 additions and 18 deletions
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65
include/poller.php
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@@ -85,6 +85,8 @@ function poller_run($argv, $argc){
poller_run_cron();
}
$refetched = false;
$starttime = time();
// We fetch the next queue entry that is about to be executed
@@ -121,6 +123,13 @@ function poller_run($argv, $argc){
logger('Process lifetime reached, quitting.', LOGGER_DEBUG);
return;
}
// If possible we will fetch new jobs for this worker
if (!$refetched && Lock::set('poller_worker_process', 0)) {
$refetched = find_worker_processes();
Lock::remove('poller_worker_process');
}
}
logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
}
@@ -235,7 +244,7 @@ function poller_execute($queue) {
* @param array $argv Array of values to be passed to the function
*/
function poller_exec_function($queue, $funcname, $argv) {
global $poller_up_start, $poller_db_duration;
global $poller_up_start, $poller_db_duration, $poller_lock_duration;
$a = get_app();
@@ -284,7 +293,11 @@ function poller_exec_function($queue, $funcname, $argv) {
* The execution time is the productive time.
* By changing parameters like the maximum number of workers we can check the effectivness.
*/
logger('DB: '.number_format($poller_db_duration, 2).' - Rest: '.number_format($up_duration - $poller_db_duration, 2).' - Execution: '.number_format($duration, 2), LOGGER_DEBUG);
logger('DB: '.number_format($poller_db_duration, 2).
' - Lock: '.number_format($poller_lock_duration, 2).
' - Rest: '.number_format($up_duration - $poller_db_duration - $poller_lock_duration, 2).
' - Execution: '.number_format($duration, 2), LOGGER_DEBUG);
$poller_lock_duration = 0;
if ($duration > 3600) {
logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
@@ -448,7 +461,7 @@ function poller_kill_stale_workers() {
foreach ($r AS $pid) {
if (!posix_kill($pid["pid"], 0)) {
dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
array('pid' => $pid["pid"]));
array('pid' => $pid["pid"], 'done' => false));
} else {
// Kill long running processes
@@ -475,7 +488,7 @@ function poller_kill_stale_workers() {
// Additionally we are lowering the priority.
dba::update('workerqueue',
array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => PRIORITY_NEGLIGIBLE, 'pid' => 0),
array('pid' => $pid["pid"]));
array('pid' => $pid["pid"], 'done' => false));
} else {
logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
}
@@ -512,7 +525,9 @@ function poller_too_much_workers() {
$listitem = array();
// 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`)");
$processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS
(SELECT id FROM `workerqueue`
WHERE `workerqueue`.`pid` = `process`.`pid` AND NOT `done` AND `pid` != ?)", getmypid());
if ($process = dba::fetch($processes)) {
$listitem[0] = "0:".$process["running"];
}
@@ -528,7 +543,16 @@ function poller_too_much_workers() {
dba::close($processes);
}
dba::close($entries);
$processlist = ' ('.implode(', ', $listitem).')';
$jobs_per_minute = 0;
$jobs = dba::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL 10 MINUTE");
if ($job = dba::fetch($jobs)) {
$jobs_per_minute = number_format($job['jobs'] / 10, 0);
}
dba::close($jobs);
$processlist = ' - jpm: '.$jobs_per_minute.' ('.implode(', ', $listitem).')';
}
$entries = poller_total_entries();
@@ -628,7 +652,10 @@ function find_worker_processes() {
// Check if we should pass some low priority process
$highest_priority = 0;
$found = false;
$limit = Config::get('system', 'worker_fetch_limit', 5);
// The higher the number of parallel workers, the more we prefetch to prevent concurring access
$limit = Config::get("system", "worker_queues", 4) * 2;
$limit = Config::get('system', 'worker_fetch_limit', $limit);
if (poller_passing_slow($highest_priority)) {
// Are there waiting processes with a higher priority than the currently highest?
@@ -644,7 +671,7 @@ function find_worker_processes() {
// Give slower processes some processing time
$result = dba::e("UPDATE `workerqueue` SET `executed` = ?, `pid` = ?
WHERE `executed` <= ? AND `priority` > ? AND NOT `done`
ORDER BY `priority`, `created` LIMIT 1",
ORDER BY `priority`, `created` LIMIT ".intval($limit),
datetime_convert(), getmypid(), NULL_DATE, $highest_priority);
if ($result) {
$found = (dba::affected_rows() > 0);
@@ -669,14 +696,29 @@ function find_worker_processes() {
* @return string SQL statement
*/
function poller_worker_process() {
global $poller_db_duration;
global $poller_db_duration, $poller_lock_duration;
$stamp = (float)microtime(true);
$found = find_worker_processes();
// There can already be jobs for us in the queue.
$r = q("SELECT * FROM `workerqueue` WHERE `pid` = %d AND NOT `done`", intval(getmypid()));
if (dbm::is_result($r)) {
$poller_db_duration += (microtime(true) - $stamp);
return $r;
}
$stamp = (float)microtime(true);
if (!Lock::set('poller_worker_process')) {
return false;
}
$poller_lock_duration = (microtime(true) - $stamp);
$stamp = (float)microtime(true);
$found = find_worker_processes();
$poller_db_duration += (microtime(true) - $stamp);
Lock::remove('poller_worker_process');
if ($found) {
$r = q("SELECT * FROM `workerqueue` WHERE `pid` = %d AND NOT `done`", intval(getmypid()));
}
@@ -689,7 +731,7 @@ function poller_worker_process() {
function poller_unclaim_process() {
$mypid = getmypid();
dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid));
dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid, 'done' => false));
}
/**
@@ -793,6 +835,7 @@ if (array_search(__file__,get_included_files())===0){
get_app()->end_process();
Lock::remove('poller_worker');
Lock::remove('poller_worker_process');
killme();
}