Apache 2 + Sun Java 8.1 load balancer connector dies under load
Hi,
We are testing the apache module "mod_loadbalancer.so" for connecting an apache 2 to a Sun Java 8.1 App Servers running on a different box.
When we perform a basic load testing (60 concurrent users) we are experiencing a very high CPU usage: apache's CPU consumption is around 30-40%per child.
This generates or very slow responses from the App Server or at some point the apache thread die, and therefore, lose of connection to the app server, generating an internal server error.
If we perform this same test directly to the App Server httpd listener, it bahaves fine. We have also performmed the same test againt static content of apache, and again the everything is ok, we even have tried using iWS instead of apache, and the CPU does not go over 4%, so it looks like the problem resides on the apache connector.
Have any of you experienced something similar?
This is the basic conf:
Web Server:
SunOS 5.9 Generic_118558-19 sun4u sparc SUNW,UltraSPARC-IIi-cEngine
Apache 2.0.54 with MPM worker (threads support) compiled with gcc
apache:~>/apps/WebServer/apache/2.0/bin/httpd -v
Server version: Apache/2.0.54
Server built:May 23 2006 07:10:19
apache:~>/apps/WebServer/apache/2.0/bin/httpd -l
Compiled in modules:
core.c
mod_access.c
mod_auth.c
mod_log_config.c
mod_env.c
worker.c
http_core.c
mod_mime.c
mod_negotiation.c
mod_dir.c
mod_actions.c
mod_alias.c
mod_so.c
httpd.conf:
#--#
#Sun AppServer Load Balancer Configuration #
#--#
LoadFile /usr/lib/libCstd.so.1
LoadModule apachelbplugin_module /apps/WebServer/apache/2.0/modules/mod_loadbalancer.so
config-file /apps/WebServer/apache/apache2-sunsecd1/conf/loadbalancer.xml
locale en
loadbalancer.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE loadbalancer PUBLIC"-//Sun Microsystems Inc.//DTD Sun ONE Application Server 7.1//EN""sun-loadbalancer_1_1.dtd">
<loadbalancer>
<cluster name="sunsecd1">
<instance disable-timeout-in-minutes="30" enabled="true" listeners="http://appserver:38082" name="sunsecd1"/>
<web-module context-root="petstore" disable-timeout-in-minutes="30" enabled="true"/>
<web-module context-root="opc" disable-timeout-in-minutes="30" enabled="true"/>
<web-module context-root="admin" disable-timeout-in-minutes="30" enabled="true"/>
<web-module context-root="supplier" disable-timeout-in-minutes="30" enabled="true"/>
<health-checker interval-in-seconds="30" timeout-in-seconds="10" url="/"/>
</cluster>
<property name="response-timeout-in-seconds" value="60"/>
<property name="reload-poll-interval-in-seconds" value="60"/>
<property name="https-routing" value="false"/>
<property name="require-monitor-data" value="false"/>
<property name="route-cookie-enabled" value="true"/>
</loadbalancer>
