PHP 4.0 Bug #9260 Updated: Strange effects ...

ID: 9260 Updated by: cynic Reported By: stefan@digiconcept.net Old-Status: Bogus Status: Closed Bug Type: Performance problem Assigned To: Comments: ah, concurrency... Previous Comments: --------------------------------------------------------------------------- [2001-02-14 09:18:41] cynic@php.net 1) microtime() isn't exactly microtime() on win32. IIRC it was improved somewhat _after_ the release of 4.0.4 pl1, but it still goes only to miliseconds. 2) there are already bug reports concerning microtime. bogusifying --------------------------------------------------------------------------- [2001-02-14 09:18:01] derick@php.net This is not a performance problem, but a bug in the microtime function. It was recently fixed in CVS. Please try a snapshot from snaps.php.net. If the problem persists, please reopen this bugreport. --------------------------------------------------------------------------- [2001-02-14 09:13:42] stefan@digiconcept.net The following script only generates an array and walks through it with 2 different loops. There are some strange effects while watching the durations of the loops. 1. Sometimes loop 1 is faster 1. Sometimes loop 2 is faster 1. Sometimes there is a negativ duration ... ? PHP seems to behave in real bizarre way ... looks like it has a will of it's own ;-) <? function test() { for ($i=0;$i<30000;$i++) { $GLOBALS['myVar'][$i]=$i; } $a = microtime(); for ($i=0;$i<count($GLOBALS['myVar']);$i++) { $GLOBALS['myVar'][$i] = $GLOBALS['myVar'][$i] *2; } $b = microtime(); foreach($GLOBALS['myVar'] as $i => $d) { $GLOBALS['myVar'][$i] = $d * 2; } $c = microtime(); echo('Results ... <br>'); echo("<b>$a<br>$b<br>$c</b><br>"); list($m,$s)=explode(' ',$a);$a = doubleval($s)+doubleval($m); list($m,$s)=explode(' ',$b);$b = doubleval($s)+doubleval($m); list($m,$s)=explode(' ',$c);$c = doubleval($s)+doubleval($m); echo("<b>$a | $b | $c</b><br><br>"); echo("Loop 1: ".($b-$a)." seconds<br>"); echo("Loop 2: ".($c-$b)." seconds<br>"); echo("<hr>"); } test();test();test();test();test(); ?> --------------------------------------------------------------------------- ATTENTION! Do NOT reply to this email! To reply, use the web interface found at http://bugs.php.net/?id=9260&edit=2