Bug #15746 Updated: Process exec() is slow from webserver - running from shell is ok ...

ID: 15746 Updated by: bharat@menalto.com Reported By: nigel@green-bean.com Status: Open Bug Type: Performance problem Operating System: Windows 2000 Server PHP Version: 4.1.1 New Comment: This is a frequently reported problem on the Gallery Users mailing list (http://gallery.sourceforge.net/) Previous Comments: ------------------------------------------------------------------------ [2002-02-26 22:29:22] nigel@green-bean.com Summary: Running a PHP script which calls exec() from withing Apache runs terribly slow or times out. Running same from the command prompt returns in seconds. Details: I (and other NT users) have run into performance issues running PHP 4.1.1 with the NETPBM distribution. When running thumbnailing operations via. webpages, the performance (throughtput) of the system is dismal. Running the same PHP script manually from the command shell completes operations in under a second which usually timeout when executed from a webpage. A full "ready to run" repro of this problem is available via. a small ZIP file at http://www.green-bean.com/bugfiles/slowrepro.zip. This contains the required NETPBM files. If these are already installed on your system, you can run the script below with slight modifications. Thanks, Nigel. ---- Repro: <? // Full repro kit including executables available from http://www.green-bean.com/bugfiles/slowrepro.zip // // Location of your NETPBM distribution // We're using http://prdownloads.sourceforge.net/gallery/netpbm1.1-gallery1.0-win32.tgz // $pbmroot = "netpbm"; // JPG input file (from http://www.green-bean.com/DallasChristmasHat.jpg) $file = "DallasChristmasHat.jpg"; function fs_exec($cmd, &$results, &$status, &$time) { // We can't redirect stderr with Windows. Hope that we won't need to. $time_st = time(); $x = exec("$cmd", $results, $status); $time = time() - $time_st; } $quiet = "-quiet"; // JPEG to PNM $cmd_to_pnm = "$pbmroot\\jpegtopnm $quiet $file > out\\$file.pnm"; print "<br>Exec: $cmd_to_pnm\n"; fs_exec($cmd_to_pnm, $results, $status, $elapsed); print "<br>Elapsed: $elapsed secs\n<br>Status: $status"; // PNM to scaled PNM $cmd_scale_pnm = "$pbmroot\\pnmscale $quiet -xysize 150 150 out\\$file.pnm > out\\$file.scale.pnm"; print "<br>Exec: $cmd_scale_pnm\n"; fs_exec($cmd_scale_pnm, $results, $status, $elapsed); print "<br>Elapsed: $elapsed secs\n<br>Status: $status"; // PNM scaled to JPG $cmd_to_jpg = "$pbmroot\\ppmtojpeg $quiet out\\$file.scale.pnm --quality=150 > out\\tn_$file"; print "<br>Exec: $cmd_to_jpg\n"; fs_exec($cmd_to_jpg, $results, $status, $elapsed); print "<br>Elapsed: $elapsed secs\n<br>Status: $status"; ?> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=15746&edit=1