Apache not honoring timeouts?
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hey,
I'm seeing a peculiar problem with apache-2.2.3 where most of the httpd
processes seem to be freezed and not doing anything. As you can see from
/server-status (attached), all of these processes have very high SS
(Seconds since beginning of most recent request) and when I do an strace
on one of those, they seem to be waiting on an external network call
forever: http://pastie.org/4202656
To give you some background on the application, it is webmail using
roundcube(php) and is doing these calls when users insert images/media
from external sources in compose window (either via html editor or via
the image/media insert buttons we provide). So, those are not really
important for us and we don't want apache to wait for those responses
forever. I see that the Timeout configured in our configs is 30 sec but
as per doc[1], it seems it is the amount of time the server will wait
for
certain events before failing a request but in this case, apache is
forking a child and it is waiting for an external call to complete. I
see a difference between this and when apache is serving a request and
wondering if the same Timeout applies?
And on php front, the timeouts are : max_execution_time = 30 and default_socket_timeout = 60
Can you please let me know how I can cut those processes and let them not wait forever?
Thanks!
[1] http://httpd.apache.org/docs/2.0/mod/core.html#timeout
httpd -V
Server version: Apache/2.2.3
Server built: May 4 2011 06:51:15
Server's Module Magic Number: 20051115:3
Server loaded: APR 1.2.7, APR-Util 1.2.7
Compiled using: APR 1.2.7, APR-Util 1.2.7
Architecture: 64-bit
Server MPM: Prefork
threaded: no
forked: yes (variable process count)
Server compiled with....
-D APACHE_MPM_DIR="server/mpm/prefork"
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_SYSVSEM_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=128
-D HTTPD_ROOT="/etc/httpd"
-D SUEXEC_BIN="/usr/sbin/suexec"
-D DEFAULT_PIDLOG="run/httpd.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_LOCKFILE="logs/accept.lock"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="conf/mime.types"
-D SERVER_CONFIG_FILE="conf/httpd.conf"
uname -a
Linux webmail2.mailhostbox.aus-tx.colo 2.6.18-238.19.1.el5 #1 SMP Fri Jul 15 07:31:24 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
cat /etc/redhat-release
CentOS release 5.6 (Final)
Attachment:
httpd_status.png
Description: PNG image
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