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further improvements to the workerqueue

This commit is contained in:
Michael 2017-06-08 20:43:30 +00:00
parent bee6ad5916
commit 8f336bffc2
1 changed files with 75 additions and 29 deletions
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72
include/poller.php
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@ -86,13 +86,21 @@ function poller_run($argv, $argc){
// If we got that queue entry we claim it for us
if (!poller_claim_process($r[0])) {
dba::unlock();
continue;
} else {
// Fetch all workerqueue data while the table is still locked
// This is redundant, but this speeds up the processing
$entries = poller_total_entries();
$top_priority = poller_highest_priority();
$high_running = poller_process_with_priority_active($top_priority);
dba::unlock();
}
// To avoid the quitting of multiple pollers only one poller at a time will execute the check
if (Lock::set('poller_worker', 0)) {
// Count active workers and compare them with a maximum value that depends on the load
if (poller_too_much_workers()) {
if (poller_too_much_workers($entries, $top_priority, $high_running)) {
logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
return;
}
@ -120,6 +128,39 @@ function poller_run($argv, $argc){
logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
}
/**
* @brief Returns the number of non executed entries in the worker queue
*
* @return integer Number of non executed entries in the worker queue
*/
function poller_total_entries() {
$s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s'", dbesc(NULL_DATE));
return $s[0]["total"];
}
/**
* @brief Returns the highest priority in the worker queue that isn't executed
*
* @return integer Number of active poller processes
*/
function poller_highest_priority() {
$s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
return $s[0]["priority"];
}
/**
* @brief Returns if a process with the given priority is running
*
* @param integer $priority The priority that should be checked
*
* @return integer Is there a process running with that priority?
*/
function poller_process_with_priority_active($priority) {
$s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
intval($priority), dbesc(NULL_DATE));
return dbm::is_result($s);
}
/**
* @brief Execute a worker entry
*
@ -421,9 +462,13 @@ function poller_kill_stale_workers() {
/**
* @brief Checks if the number of active workers exceeds the given limits
*
* @param integer $entries The number of not executed entries in the worker queue
* @param integer $top_priority The highest not executed priority in the worker queue
* @param boolean $high_running Is a process with priority "$top_priority" running?
*
* @return bool Are there too much workers running?
*/
function poller_too_much_workers() {
function poller_too_much_workers($entries = NULL, $top_priority = NULL, $high_running = NULL) {
$queues = Config::get("system", "worker_queues", 4);
$maxqueues = $queues;
@ -442,6 +487,7 @@ function poller_too_much_workers() {
$slope = $maxworkers / pow($maxsysload, $exponent);
$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
if (Config::get('system', 'worker_debug')) {
// Create a list of queue entries grouped by their priority
$listitem = array();
@ -463,18 +509,18 @@ function poller_too_much_workers() {
}
dba::close($entries);
$processlist = ' ('.implode(', ', $listitem).')';
}
$s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s'", dbesc(NULL_DATE));
$entries = $s[0]["total"];
if (is_null($entries)) {
$entries = poller_total_entries();
}
if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
$s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
$top_priority = $s[0]["priority"];
$s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
intval($top_priority), dbesc(NULL_DATE));
$high_running = dbm::is_result($s);
if (is_null($top_priority)) {
$top_priority = poller_highest_priority();
}
if (is_null($high_running)) {
$high_running = poller_process_with_priority_active($top_priority);
}
if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
$queues = $active + 1;
@ -620,7 +666,7 @@ function poller_claim_process($queue) {
$success = dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid),
array('id' => $queue["id"], 'pid' => 0));
dba::unlock();
//dba::unlock();
if (!$success) {
logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);