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Posted to modperl@perl.apache.org by Tim Gardner <tg...@codeHorse.com> on 2002/10/09 20:21:35 UTC
httpd - where are these zombies coming from?
I'm having trouble with zombies. Red Hat 7.1 on a Dell server with 1
GB memory. The following ps output shows a somewhat typical output.
Sometimes there are no zombies, but most of the time there are
several, and often as many as this. Performance often seems
sluggish, and I am assuming that this is because of this problem,
though I don't know that for sure. Turning off the database lowers
usage and decreases the number of zombies, but I don't know if this
is due to the database or to the lower usage.
I can't figure out what is going on. Any help / suggestions would be
much appreciated.
$ ps -aux | grep apache
root 30060 0.4 0.3 5564 3508 ? S 13:36 0:04
/usr/local/apache
apache 15892 0.0 0.3 5632 3612 ? S 13:54 0:00
/usr/local/apache
apache 16631 0.0 0.3 5632 3612 ? S 13:55 0:00
/usr/local/apache
apache 16690 2.2 1.1 16604 11372 ? S 13:55 0:00
/usr/local/apache
apache 16892 6.8 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16894 0.2 0.3 5632 3680 ? S 13:55 0:00
/usr/local/apache
apache 16903 0.3 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16911 0.2 0.3 5648 3696 ? S 13:55 0:00
/usr/local/apache
apache 16939 0.0 0.3 5640 3680 ? S 13:55 0:00
/usr/local/apache
apache 16957 25.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16962 0.0 0.3 5652 3692 ? S 13:55 0:00
/usr/local/apache
apache 16963 0.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16964 0.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16969 0.0 0.3 5636 3676 ? S 13:55 0:00
/usr/local/apache
apache 16970 0.0 0.3 5636 3684 ? S 13:55 0:00
/usr/local/apache
apache 16985 0.0 0.3 5636 3676 ? S 13:55 0:00
/usr/local/apache
apache 16987 0.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16989 0.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16991 1.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16992 0.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16993 0.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16994 0.0 0.0 0 0 ? Z 13:55 0:00 [httpd
<defunct>]
apache 16995 0.0 0.3 5636 3676 ? S 13:55 0:00
/usr/local/apache
apache 16996 1.0 0.3 5636 3676 ? S 13:55 0:00
/usr/local/apache
admin 16998 0.0 0.0 1740 604 pts/0 S 13:55 0:00 grep apache
My httpd.conf has the following:
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 15
MinSpareServers 10
MaxSpareServers 15
StartServers 15
MaxClients 35
MaxRequestsPerChild 300
/usr/local/apachessl/bin/httpd -V
Server version: Apache/1.3.26 (Unix)
Server built: Aug 10 2002 01:35:37
Server's Module Magic Number: 19990320:13
Server compiled with....
-D EAPI
-D HAVE_MMAP
-D HAVE_SHMGET
-D USE_SHMGET_SCOREBOARD
-D USE_MMAP_FILES
-D HAVE_FCNTL_SERIALIZED_ACCEPT
-D HAVE_SYSVSEM_SERIALIZED_ACCEPT
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D HTTPD_ROOT="/usr/local/apachessl"
-D SUEXEC_BIN="/usr/local/apachessl/bin/suexec"
-D DEFAULT_PIDLOG="logs/httpd.pid"
-D DEFAULT_SCOREBOARD="logs/httpd.scoreboard"
-D DEFAULT_LOCKFILE="logs/httpd.lock"
-D DEFAULT_ERRORLOG="logs/error_log"
-D TYPES_CONFIG_FILE="conf/mime.types"
-D SERVER_CONFIG_FILE="conf/httpd.conf"
-D ACCESS_CONFIG_FILE="conf/access.conf"
-D RESOURCE_CONFIG_FILE="conf/srm.conf"
I built it with:
-rw-r--r-- 1 admin admin 2303147 Aug 9 22:10 apache_1.3.26.tar.gz
-rw-r--r-- 1 admin admin 372525 Aug 9 22:14 mod_perl-1.27.tar.gz
-rw-r--r-- 1 admin admin 753241 Aug 9 23:27
mod_ssl-2.8.10-1.3.26.tar.gz
-rw-r--r-- 1 admin admin 2170570 Aug 10 01:22 openssl-0.9.6g.tar.gz
Thanks,
Tim
Re: httpd - where are these zombies coming from?
Posted by Stas Bekman <st...@stason.org>.
Tim Gardner wrote:
> I'm having trouble with zombies. Red Hat 7.1 on a Dell server with 1 GB
> memory. The following ps output shows a somewhat typical output.
> Sometimes there are no zombies, but most of the time there are several,
> and often as many as this. Performance often seems sluggish, and I am
> assuming that this is because of this problem, though I don't know that
> for sure. Turning off the database lowers usage and decreases the
> number of zombies, but I don't know if this is due to the database or to
> the lower usage.
>
> I can't figure out what is going on. Any help / suggestions would be
> much appreciated.
[...]
check
http://perl.apache.org/docs/1.0/guide/performance.html#Forking_and_Executing_Subprocesses_from_mod_perl
in particular
http://perl.apache.org/docs/1.0/guide/performance.html#Avoiding_Zombie_Processes
my guess is that you use fork or its variations which leaves zombies.
__________________________________________________________________
Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
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