First time posting on the tomcat list so bear with me if this doesn't
make any sense :)
I am currently in development of an app which we are testing through
tomcat6 (websphere specifically). Now that we are moving to production
we wanted to use apache (Apache 2.2.8) to serve up static content
instead of running everything through tomcat. I am running into a small
performance issue, which seems to be eluding me. I have a good amount of
experience with apache but very little tomcat experience so tell me if
this looks off. First of all, the issue...
Basically it seems like I can't get concurrent requests to apache once
an AJP connector request fires off to tomcat. It seems like the struts
action I call blocks other requests to the apache process till it
returns with a response. This is not the case when I am connecting
directly to tomcat. Below are two images of firebug http monitors that
should highlight what I am describing...
Tomcat Direct - http://207.7.102.90/~thecorp/tomcat.jpg
Apache AJP - http://207.7.102.90/~thecorp/apache-ajp.jpg
As you can see, the static files like css/js/imges start loading
concurrently with the struts action on the Tomcat Direct method but not
with AJP which seems to wait till the action returns before loading
other files. Here are the relevant config options I have set for the server.
Apache2.conf (I am using prefork)*
*<IfModule mpm_prefork_module>
StartServers 10
MinSpareServers 10
MaxSpareServers 20
MaxClients 256
MaxRequestsPerChild 0
</IfModule>*
*JkSetup*
*JkWorkersFile /etc/local/WebSphere/var/config/workers.properties
JkLogFile /etc/local/WebSphere/var/log/apache_mod_jk.log
JkLogLevel error
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
JkShmFile /etc/local/WebSphere/var/log/mod_jk.shm
Tomcat Config.xml
<attribute name="minSpareThreads">25</attribute>
<attribute name="maxSpareThreads">75</attribute>
<attribute name="enableLookups">false</attribute>
Worker Config
worker.list=geronimo_ajp13
worker.geronimo_ajp13.port=8009
worker.geronimo_ajp13.host=localhost
worker.geronimo_ajp13.type=ajp13
Virtual Host
JkMount /*.pages geronimo_ajp13
JkMount /*.jsp geronimo_ajp13
JkMount /*.action geronimo_ajp13
JkMount /*j_security_check geronimo_ajp13
I assume its something wrong with my apache config, maybe something to
do with MaxRequestsPerChild 0? I have tried many permutations of
MaxRequestsPerChild and other settings. I have also read through lots of
tutorials for apache/tomcat/mod_jk but I can't seem to figure out why
this is happening. Do I need to start using the worker mpm or prefork?
Thanks!
Jason Joseph
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