2010/11/21 Honza Lefty Škoda <le...@multihost.cz>: > I am running performance benchmarks with ab2 on my server and I > discovered that fcgid creates much more than FcgidMaxProcessesPerClass. > And if I make 15 concurrent requests fcgi starts 15 php processes at the > same time without worrying about FcgidSpawnScoreUpLimit! > > I use mod_fcgid with suexec for php execution (via php-wrapper bash > script, which does a lot of magic including execs, chroot and setuid). > > The configuration (for fcgid 2.3.6 on apache 2.2.15): > > /etc/apache2/modules.d/20_mod_fcgid.conf: > 25: FcgidMinProcessesPerClass 0 > 26: FcgidMaxProcessesPerClass 10 > > 33: FcgidSpawnScore 10 > 34: FcgidTerminationScore 20 > 35: FcgidTimeScore 1 > 36: FcgidSpawnScoreUpLimit 25
I did find/fix one related issue this a.m.: the first process created didn't adjust the score, so you could in effect create one more process than desired during ramp-up. I didn't see your exact issue though. Two things: Does your "magic" wrapper logic preserve the pid created by mod_fcgid (i.e., use exec instead of fork)? If not, the fcgid PM will be confused and you're probably getting requests successfully processed between the time fcgid forks a child and when it exits. (That probably isn't a workable explanation since an exiting child would add a huge number -- 20 -- to the score. But please confirm anyway :) ) If you are preserving the pid (i.e., fcgid PM can track what it has created), turn on LogLevel info and see if you can get more insight into what is happening with spawn score manipulation/checking. Here's what I get using the directives you posted and hammering on one script with ab (>100 current clients): [Sun Nov 21 10:17:53 2010] [info] Server built: Nov 11 2010 13:37:51 [Sun Nov 21 10:17:53 2010] [debug] prefork.c(1018): AcceptMutex: sysvsem (default: sysvsem) [Sun Nov 21 10:18:03 2010] [info] mod_fcgid: server 127.0.1.1:/home/trawick/myhg/apache/fcgid/apps/info.pl(10258) started [Sun Nov 21 10:18:04 2010] [info] mod_fcgid: server 127.0.1.1:/home/trawick/myhg/apache/fcgid/apps/info.pl(10260) started [Sun Nov 21 10:18:04 2010] [info] mod_fcgid: server 127.0.1.1:/home/trawick/myhg/apache/fcgid/apps/info.pl(10261) started [Sun Nov 21 10:18:04 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 29 >= 25, skip the spawn request [Sun Nov 21 10:18:06 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 27 >= 25, skip the spawn request [Sun Nov 21 10:18:06 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 27 >= 25, skip the spawn request [Sun Nov 21 10:18:06 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 27 >= 25, skip the spawn request [Sun Nov 21 10:18:07 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 26 >= 25, skip the spawn request [Sun Nov 21 10:18:07 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 26 >= 25, skip the spawn request [Sun Nov 21 10:18:07 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 26 >= 25, skip the spawn request [Sun Nov 21 10:18:07 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 26 >= 25, skip the spawn request [Sun Nov 21 10:18:07 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 26 >= 25, skip the spawn request [Sun Nov 21 10:18:08 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 25 >= 25, skip the spawn request [Sun Nov 21 10:18:08 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 25 >= 25, skip the spawn request [Sun Nov 21 10:18:08 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 25 >= 25, skip the spawn request [Sun Nov 21 10:18:08 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 25 >= 25, skip the spawn request [Sun Nov 21 10:18:09 2010] [info] mod_fcgid: server 127.0.1.1:/home/trawick/myhg/apache/fcgid/apps/info.pl(10356) started [Sun Nov 21 10:18:09 2010] [info] mod_fcgid: /home/trawick/myhg/apache/fcgid/apps/info.pl spawn score 34 >= 25, skip the spawn request That looks good to me. > By the way - according to documentation, FcgidMinProcessesPerClass in > VirtualHost section shouldn't work. For me, it does (and I'm happy with > it :)). Is this where you are looking? http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html#fcgidminprocessesperclass If so, can you explain further what you mean, as I don't see any indication that it shouldn't work. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org " from the digest: users-digest-unsubscr...@httpd.apache.org For additional commands, e-mail: users-h...@httpd.apache.org
