#25325 [Fbk->Opn]: command from exec do not migrate in an openMosix cluster

ID: 25325 User updated by: carb at videotron dot ca Reported By: carb at videotron dot ca -Status: Feedback +Status: Open Bug Type: Filesystem function related Operating System: RedHat 9.0 PHP Version: 4.3.3 New Comment: I think it is related to PHP because that exact command get migrated correctly when executed from the command line, but does not when it is executed from PHP/exec(). When starting the process from the command line, the process sizes are: SIZE:128, RSS:128, SHARE:40 and it migrates. When starting the process from PHP/Apache, the process sizes are: SIZE:736, RSS:732, SHARE:652 and it does NOT migrate. When starting the process from PHP at the command line, the process sizes are: SIZE:740, RSS:732, SHARE:652 and it does NOT migrate. So we can see that there is alot of extra stuff comming from PHP that is in the process and it would be this that is affecting the migration. openMosix cannot migrate processes that have shared memory, there may be something like that coming from comming from PHP. I also posted a message to the openMosix group in case they can help. https://sourceforge.net/tracker/index.php?func=detail&aid=797919&group_id=46729&atid=447171 Thanks in advance, Real Previous Comments: ------------------------------------------------------------------------ [2003-08-30 16:12:41] derick@php.net Why do you think this is related to PHP? PHP does *nothing* special with processes... I wonder how this can be related to OpenMosix. ------------------------------------------------------------------------ [2003-08-30 16:08:02] vincent@php.net Sorry, I did not meant to do that. ------------------------------------------------------------------------ [2003-08-30 16:07:01] vincent@php.net Please try using this CVS snapshot: http://snaps.php.net/php4-STABLE-latest.tar.gz For Windows: http://snaps.php.net/win32/php4-win32-STABLE-latest.zip ------------------------------------------------------------------------ [2003-08-30 16:05:16] carb at videotron dot ca Description: ------------ executing a command from PHP, the command does not get migrated in an openMosix cluster, even if the command migrates when it is executed from the command line. Running "awk 'BEGIN {for(i=0;i<10000;i++)for(j=0;j<10000;j++);}' > /dev/null 2>&1 &" from a command line several times creates processes that get migrated. Running the same thing several times from an exec in a PHP script does not get migrated. The same problem occurs whether the script is executed from apache "http://localhost/test.php/" or the command line "php test.php" Reproduce code: --------------- <?PHP exec("awk 'BEGIN {for(i=0;i<10000;i++)for(j=0;j<10000;j++);}' > /dev/null 2>&1 &"); ?> Expected result: ---------------- When executing the script several times in an openMosix cluster, some of the processes should migrate. Actual result: -------------- When executing the script several times in an openMosix cluster, none of the processes migrate. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=25325&edit=1