#14237 [Opn->Bgs]: reference calls in some cases very slow

ID: 14237 Updated by: andrey@php.net Reported By: alberty@neptunelabs.com -Status: Open +Status: Bogus Bug Type: Performance problem Operating System: i686-pc-linux-gnu PHP Version: 4.1.0 New Comment: I modified the script a bit by adding var_dump(microtime()) around the function calls. The output : With reference: string(21) "0.58075200 1041701482" string(21) "0.20217700 1041701490" Without reference: string(21) "0.20247500 1041701490" string(21) "0.20739800 1041701490" as everyone may see without reference is faster as it has to be (according to some docs). I think that there is something wrong in the way the script computes the time. Ooops, I found it : $tmp = explode(' ', microtime()); $measure['Start Reference']=(double)$tmp[0] + (double)$tmp[1]; the indexes are swapped must be $measure['Start Reference']=(double)$tmp[1] + (double)$tmp[0]; Closing this. Previous Comments: ------------------------------------------------------------------------ [2002-01-31 05:12:55] bs_php@infeer.com I did some benchmark tests on loops and so that also delever some strange results. See it run at: http://phpxpath.sourceforge.net/benchmark/phpBench.php Code at: http://phpxpath.sourceforge.net/benchmark/phpBench.php.txt ------------------------------------------------------------------------ [2001-12-13 04:47:07] alberty@neptunelabs.com I think, this is an very annoying behavior of the zend engine and also there are no warning or clue in the documentation. Someone must change it. ------------------------------------------------------------------------ [2001-12-12 20:06:28] mfischer@php.net That's a known issue with the current Zend Engine. We could move it to a ZE feature request, but will it change anything soon? I doubt ... ------------------------------------------------------------------------ [2001-12-12 19:59:37] yohgaki@php.net PHP Version updated to 4.1.0 ------------------------------------------------------------------------ [2001-12-12 19:58:57] yohgaki@php.net Output from Linux Celeron 433/384MB/PHP 4.1.0/Apache 1.3.22. Loopcount: 100 String size: 1048576 Time for function request "with_reference" : 1.6308959722519 secs Time for function request "without_reference": 0.0011709928512573 secsexecution time of without_reference is 1393 times fast as with_reference! There must be something wrong.... ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/14237 -- Edit this bug report at http://bugs.php.net/?id=14237&edit=1