Redhat – Apache Settings | Optimization Advice

apache-2.2redhat

I was hoping to get some expert advice on the best settings for apache.

Currently our site operates the following way.

  1. User Request the page with low resolution images.
  2. The page loads quickly and then javascript will lazy load.
  3. Ajax is called to perform different functions.

Some pages might have 30 requests for that user.

The servers being used are

  1. Dual Quad core Xeon Proc
  2. 8gb ram
  3. SSD HD
  4. Mysql is used.
  5. Redhat

Current apache settings are 

KeepAlive on
MaxKeepAliveRequests 100
KeepAliveTimeout 15


<IfModule prefork.c>
StartServers       8
MinSpareServers    5
MaxSpareServers   20
ServerLimit  256
MaxClients   256
MaxRequestsPerChild  4000
</IfModule>

<IfModule worker.c>
StartServers         4
MaxClients         300
MinSpareThreads     25
MaxSpareThreads     75
ThreadsPerChild     25
MaxRequestsPerChild  0
</IfModule>

I am thinking keepalive should be on, but the timeout should be set to 1 second. Any thoughts would be much appreciated.

#

httpd -V
Server version: Apache/2.2.15 (Unix)
Server built:   Feb  7 2012 09:50:11
Server's Module Magic Number: 20051115:24
Server loaded:  APR 1.3.9, APR-Util 1.3.9
Compiled using: APR 1.3.9, APR-Util 1.3.9
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"

Best Answer

Test, test, test and test.

Grab some decent load generators (no, ab is not suited) like siege, jperf, flood or tsung, establish a baseline, then start loading with different combinations of requests and busyness.

It is also evident that you have no clue how apache is currently configured, since only one MPM is used at any time; pre-2.4, this is actually compiled-in and cannot be changed after installation.

So first of all, figure out what the current config actually is; update your post with the results of httpd -V and we can provide further help.

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