#26800 [NEW]: terrible performance doing array-index-access

From: eagle at shattered-reality dot de Operating system: WinNT4-SP6a PHP version: 4.3.4 PHP Bug Type: Performance problem Bug description: terrible performance doing array-index-access Description: ------------ I encountered some serious performance problems on our server (2x 2.8 Xeon / 2gb ram / WinNT4-SP6) using scripts that had run very well on my small office workstation (Athlon 2400+ / 512gb ram / Win2k). I did some benchmarking (using scripts from http://www.sebastian-bergmann.de/PHP_Benchmark/ ) using cmdline php.exe on the server and found out that the "Array Index Access" test gives terrible results (around 10.000 accesses/s compared to around 745.000/s on my workstation). All other tests behaved as expected, so I don't think it is a configuration problem. I tried different versions of php.ini (including php.ini-dist) and various versions of php itself (up to 5.0.0b1 / can't try 5.0.0b3 because of the getlongpathname bug). This beaviour started in 4.1.0 while everything runs fine under 4.0.6. I don't have a second box with a similar setup, so I can't test other OS, but I have failed to reproduce this on any single-cpu system (Intel/Amd) running various OS (WinNT/Win2k/WinXP). Reproduce code: --------------- $N = 1000000; $table = array(); $start = getMicrotime(); for ($i = 0; $i < $N; $i++) { $table[$i] = $i; } for ($i = 0; $i < $N; $i++) { $i = $table[$i]; } $end = getMicrotime(); -- Edit bug report at http://bugs.php.net/?id=26800&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=26800&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=26800&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=26800&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=26800&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=26800&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=26800&r=needscript Try newer version: http://bugs.php.net/fix.php?id=26800&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=26800&r=support Expected behavior: http://bugs.php.net/fix.php?id=26800&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=26800&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=26800&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=26800&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=26800&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=26800&r=dst IIS Stability: http://bugs.php.net/fix.php?id=26800&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=26800&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=26800&r=float