Rainer,
Thanks for the reply! You're certainly right on the JK version.
Can you be more specific on the "add some more timeouts" comment? Do
you mean a higher number on connection_pool_timeout?
Also, should the relationship between httpd's MaxClients and the
connector's maxThreads be 1:1 or what? The httpd server does do
additional work besides simply front-ending Tomcat, so I'd assume that
we'd want MaxClients to be at least the same as MaxThreads, and probably
much more depending on how much additional work the httpd server does.
Is this reasonable? I'm just trying to get a handle on the relationships.
Thanks,
Brantley
Rainer Jung wrote:
Please update mod_jk. 1.2.6 is *very* outdated. We are now at 1.2.22 and
a lot of things have improved.
After upgrading, check your configuration against the reference guide in
the docs, especially the pages for the worker properties and Apache
directives. You might want to add some more timeouts.
BTW: Maximum Apache parallelity of 150 does not really fit to a maximum
tomcat parallelity of 1500 unless your tomcat does serious extra work .
Regards,
Rainer
Brantley Hobbs wrote:
All,
I have a web application that appears to run just fine at low loads,
but when we ramp up to high load levels, strange things start happening.
The symptoms are a *ton* of apparently hung threads on the tomcat
status page for my JK connector. They're in stage "S", with 0KB sent
and 0KB recv and they never die.
Eventually, we reach a point on httpd where we get:
[error] server reached MaxClients setting, consider raising the
MaxClients setting
And when we reach this point, the entire httpd server stops
responding. I post this to the tomcat list because this same server
serves PHP under similar (or worse) loads with no problems.
Here's my worker properties file:
worker.lbJ2EE.balanced_workers=web1
worker.web1.type=ajp13
worker.web1.host=128.192.100.14
worker.web1.port=8009
worker.web1.lbfactor=1
worker.web1.retries=5
worker.web1.connection_pool_timeout=60
Here's my AJP connector's configuration:
<Connector port="8009" enableLookups="false" redirectPort="8443"
protocol="AJP/1.3" maxThreads="1500" backlog="300"
connectionTimeout="60000"/>
Here's my httpd worker.c configuration
<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>
Tomcat 5.5.23 (Sun jvm 1.6.0-b105)
Apache 2.0.52
mod_jk 1.2.6
All running on RHEL4
Any help appreciated! I don't have a great deal of Tomcat load tuning
experience.
Brantley Hobbs
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
