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Date: Sat, 12 Feb 2011 14:23:36 -0800 (PST)
From: Tony Anecito <adanecito@yahoo.com>
Subject: Re: Performance Tuning Tomcat 7...
To: Tomcat Users List <users@tomcat.apache.org>
Cc: users@jersey.java.net
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Yep visualvm showed me where the issue is. It is in the jersey servlet it makes 
so many calls it all adds up. And that is before it calls my class which only 
takes 5-6 microseconds to execute.
I am not sure what I can do about this unless there is some advice from the 
Jersey team about how to short-circuit some of these calls.

I attached the screenshot of visualvm showing what I mean.

Thanks,
-Tony


----- Original Message ----
From: Mark Thomas <markt@apache.org>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Sat, February 12, 2011 11:45:29 AM
Subject: Re: Performance Tuning Tomcat 7...

On 12/02/2011 18:27, Tony Anecito wrote:
> Right now for most of my transactions I get less than 5 microseconds and around 
>
> 1.2msec is spent on getting to and out of Tomcat and out of to/out of the 
>client 
>
> call.
> 
> So people were saying look at better parsers or replacing whatever does the 
> parsing.
> 
> I am measuring round trip time at the client (before and after the jersey call) 
>
> and getting to 1.47msec. At Tomcat it is less than 5microseconds at the 
> beginning of the method the GET goes to the end of the method so the code is 
> very fast.
> 
> So I am thinking whatever parses the cmd and puts together the html response 
> after the end of the method is where I should focus.

Testing Tomcat on localhost with a simple servlet using my 3 year old
laptop I can process around 20,000 requests a second on a single
connection which is around 50 microseconds per request. That includes
server and client processing.

Looking at all these numbers suggests that there is a lot of additional
overhead somewhere in your system. Based on past experience, guessing
where that overhead might be is a waste of time. You need to use a
profiler to track it down. I usually use Yourkit since they give free
copies to the Tomcat committers for use with Tomcat development. Other
profilers are available. Pick the one that works best for you.

Mark


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