Re: Tomcat - threads / throughput limits?

[Andrew Miehs]

On 08/11/2007, at 4:51 PM, Jim Cox wrote:

On Nov 8, 2007 10:41 AM,  <[EMAIL PROTECTED]> wrote:

In resolving our current bottleneck i used JProfiler to see what the

threads which are blocked on this:

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run()


run them, either way they're not runnable anyway.

tomcat applications were doing and when under high load there are a lot of This suggests that they are spending all their time waiting for tomcat to

"http80-Processor131" daemon prio=5 tid=0x00baa7c0 nid=0x10f9 in
Object.wait() [0xa5e81000..0xa5e819c8]
       at java.lang.Object.wait(Native Method)
       - waiting on <0xc9d99d20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)

FWIW, I always interpreted those as HTTP servicing threads waiting for
something to do (i.e. not a bad thing at all).

and not doing anything.


you have.


Cheers

Andrew

Have you tried running your profiler against a tomcat not doing ANY requests? I agree with Jim on this one - These are threads WAITING on a connection... Have a look in tomcat manager, and then you can see how many 'free' connections

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