Thread Names..Which in Important?

[keeplearning <p_...@yahoo.com>]

Hi All,

I am relatively new to Tomcat. I was looking at thread dumps which we took
from Tomcat and I see lots of thread names. Now, I am not sure which one is
important to look at.
Some of threads I see are as follows:


"http-8080-Processor15"

"TP-Processor1"

WorkerThread(receive_transaction_complete_stage,0)

"Timer-4"

"message-bus-1"


Thanks in Advance for your help
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Re: Thread Names..Which in Important?

[Christopher Schultz <ch...@christopherschultz.net>]

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To whom it may concern,

keeplearning wrote:
> I am relatively new to Tomcat. I was looking at thread dumps which we took
> from Tomcat and I see lots of thread names. Now, I am not sure which
one is
> important to look at.
> Some of threads I see are as follows:
>
> "http-8080-Processor15"

These are the HTTP request processing threads running on port 8080. If
you also have a connector configured for HTTP to listen on, say, port
8090, then you'll have a set of threads called http-8090-ProcessorABC
where ABC is the thread number. You will see a whole bunch of these
threads, since Tomcat will start at most "maxThreads" (defined on the
<Connector> element in server.xml) threads. The default (for Tomcat 6.0)
is 40 threads max.

> "TP-Processor1"

Oddly enough, these are also request processing threads, but these are
for the AJP connector. I'm not sure why the AJP connector doesn't name
its threads similar to the HTTP ones (like ajp-8009-Processor1 or
something like that), but that's the case.

> WorkerThread(receive_transaction_complete_stage,0)

I have no idea what this might be. Check the stack trace to see what
it's doing, and that may give you your answer.

> "Timer-4"

This looks like it's a timer, probably from your application using the
JDK's TimerTask classes. See Sun's javadoc for java.util.Timer. I don't
believe Tomcat uses this internally.

> "message-bus-1"

I don't believe this is Tomcat-related.

Hope that helps,
- -chris
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