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From Mark Thomas <ma...@apache.org>
Subject Re: Performance Tuning Tomcat 7...
Date Sat, 12 Feb 2011 18:45:29 GMT
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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