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Add Comments to Worker Exponent Implementation

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miqrogroove 2018-06-20 06:43:57 -04:00 committed by GitHub
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5
src/Core/Worker.php
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@ -625,6 +625,11 @@ class Worker
if ($load) { if ($load) {
$maxsysload = intval(Config::get("system", "maxloadavg", 50)); $maxsysload = intval(Config::get("system", "maxloadavg", 50));
/* Default exponent 3 causes queues to rapidly decrease as load increases.
* If you have 20 max queues at idle, then you get only 5 queues at 37.1% of $maxsysload.
* For some environments, this rapid decrease is not needed.
* With exponent 1, you could have 20 max queues at idle and 13 at 37% of $maxsysload.
*/
$exponent = intval(Config::get('system', 'worker_load_exponent', 3)); $exponent = intval(Config::get('system', 'worker_load_exponent', 3));
$slope = pow(max(0, $maxsysload - $load) / $maxsysload, $exponent); $slope = pow(max(0, $maxsysload - $load) / $maxsysload, $exponent);
$queues = intval(ceil($slope * $maxqueues)); $queues = intval(ceil($slope * $maxqueues));