note 129799 added to language.fibers

From my observation you will not get any parallel benefit from Fibers unless you Fiber::suspend() after some kind of system or server call. In other words, if you were to Fiber::suspend() within the function passed to new Fiber before $t = microtime(true), as opposed to after it, the code below would take one thousand seconds, instead of just over one second. Also, note that main thread code will not run in parallel unless all Fibers are started before any of the Fibers are resumed. <?php // 1000 Fibers that take one second individually can take about one second total along with the main thread in parallel $entireExecutionStartTime = microtime(true); function createTimeoutFibers(int $count = 1, float $milliseconds = 1000):array{ $a = []; $cF = function() use ($milliseconds):Fiber{ $f = new Fiber(function() use ($milliseconds){ $t = microtime(true); Fiber::suspend(); while(($q = microtime(true)-$t) < $milliseconds/1000){} // wait one second return $q; }); $f->start(); return $f; }; for($i=0; $i<$count; $i++){ $a[] = $cF(); } return $a; } // create an array of 1000 Fibers that each wait one second $a = createTimeoutFibers(1000); $fiberExecutionTimes = []; // wait one second on the main thread - to receive a main thread benefit this must occur after all FiberInstance->start()s and before any FiberInstance->resume()s $m = microtime(true); while(microtime(true)-$m < 1){} foreach($a as $f){ while(!$f->isTerminated()){ $f->resume(); } $fiberExecutionTimes[] = $f->getReturn(); } $entireExecutionTime = microtime(true)-$entireExecutionStartTime; // easy to read output in $test $test = '$fiberExecutionTimes = ['.join(', ', $fiberExecutionTimes).']; $entireExecutionTime = '.$entireExecutionTime.';'; ?> ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.84.18 (proxied: 24.19.197.14) ---- Manual Page -- https://php.net/manual/en/language.fibers.php Edit -- https://main.php.net/note/edit/129799 Del: integrated -- https://main.php.net/note/delete/129799/integrated Del: useless -- https://main.php.net/note/delete/129799/useless Del: bad code -- https://main.php.net/note/delete/129799/bad+code Del: spam -- https://main.php.net/note/delete/129799/spam Del: non-english -- https://main.php.net/note/delete/129799/non-english Del: in docs -- https://main.php.net/note/delete/129799/in+docs Del: other reasons-- https://main.php.net/note/delete/129799 Reject -- https://main.php.net/note/reject/129799 Search -- https://main.php.net/manage/user-notes.php