ID: 22435 User updated by: carl at topthetable dot com Reported By: carl at topthetable dot com -Status: Bogus +Status: Open Bug Type: Performance problem Operating System: Redhat 7.2 PHP Version: 4.3.1 New Comment:
Thanks for your reply, and better script. Here are my results, showing the times on the Redhat and OSX boxes respectively ... Redhat 7.2 (PIII 700Mhz): 0.000356078147888 3.09110200405 24.5502359867 55.3548690081 136.626052976 ... Gave up waiting. As you can see, this is not correct behaviour. You can clearly see that the time isn't constant, nor increasingly linearly. I therefore say there is something wrong. OSX (iBook, 500Mhz): 0.00040602684021 0.000491976737976 0.000488996505737 0.000484943389893 0.000471949577332 0.000415086746216 0.000434041023254 0.00104403495789 0.000488996505737 0.000432014465332 Avg: 0.00051580667495 This is as per your results. Previous Comments: ------------------------------------------------------------------------ [2003-02-26 09:24:56] [EMAIL PROTECTED] Try this script which actually shows the time _spend_ for count: <?php function getmicrotime(){ list($usec, $sec) = explode(" ",microtime()); return ((float)$usec + (float)$sec); } $tot = 0; for ($j=0; $j < 10; $j++) { $time = dosize($j * 1000); echo $time,"\n"; $tot += $time; } echo "Avg: ", $tot/$j, "\n"; function dosize( $y ) { $t = array(); for ( $i=0; $i<$y; $i++ ) { $t[] = array( array( "3", "1" ), "3", array( array ( "5", "1", "8" )) ); } $start = getmicrotime(); count( $t ); $end = getmicrotime(); return $end - $start; } ?> Results for me: Linux (double Celeron 500Mhz): 0.00995302200317 0.000295042991638 0.000288963317871 0.000303030014038 0.000295042991638 0.000295042991638 0.000294089317322 0.000292062759399 0.000293016433716 0.000355005264282 Avg: 0.00126643180847 MacOSX, PowerPC (1Ghz or faster, not sure): 0.00011193752288818 9.0956687927246E-05 0.00010311603546143 0.00010299682617188 0.00010395050048828 0.00010097026824951 0.00011003017425537 0.00013697147369385 0.00010299682617188 0.00010597705841064 Avg: 0.00010699033737183 Nothing wrong here.. ------------------------------------------------------------------------ [2003-02-26 08:11:50] carl at topthetable dot com count() is increasingly slow when used to count large arrays. This is using 4.3.1 (compiled from source) on a Redhat 7.2 box. The box has about 80Mb free, so it's not a paging issue. It works as expected on Mac OS X running 4.3.1-dev. Looking at PHP's and Zend's source, I would expect the time taken to return the count() of an array to be similar regardless of the size of the array. Below is a script to demonstrate the problem. <? $st = microtime(); echo "Script started: ".microtime()."\n"; dosize( 10 ); dosize( 20 ); dosize( 50 ); dosize( 100 ); dosize( 200 ); dosize( 500 ); dosize( 1000 ); dosize( 5000 ); dosize( 10000 ); function dosize( $y ) { echo "Doing size $y\n"; echo " Starting array building:".microtime()."\n"; $t = array(); for ( $i=0; $i<$y; $i++ ) { $t[] = array( array( "3", "1" ), "3", array( array ( "5", "1", "8" ) ) ); } echo " Array built: ".microtime()."\n"; count( $t ); echo " Count finished: ".microtime()."\n"; } ?> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=22435&edit=1