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
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