2010/11/21 Honza Lefty Škoda <le...@multihost.cz>: > > > On 21.11.2010 16:57, Jeff Trawick wrote:: >> 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 :) ) > Yes, PID of php-cgi process matches the one in server-status worker list. > >> >> 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): > > Good idea! > I tried to run the tests again with surprising results. Some > VirtualHosts break rules: > > Sun Nov 21 16:57:33 2010] [info] mod_fcgid: server > *:/opt/hostik/webbin/php-wrapper.fcgi(11473) started > [Sun Nov 21 16:57:33 2010] [info] mod_fcgid: server > *:/opt/hostik/webbin/php-wrapper.fcgi(11474) started > [Sun Nov 21 16:57:33 2010] [info] mod_fcgid: server > *:/opt/hostik/webbin/php-wrapper.fcgi(11475) started ... > > After several benchmarks I found out that it's caused by the > FcgidMinProcessesPerClass which is set to 1 for some vhosts. When I set > this, scores are completely ignored!
Thanks for finding that; I've now duplicated it. Hopefully it will be easy to resolve. (It acts like a classic merging bug, but the score configurations are supposed to be taken from the main vhost so merging is supposed to be irrelevant.) --------------------------------------------------------------------- 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
