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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Tomcat and my application's performance ... time being lost?
Date Mon, 12 Apr 2004 12:41:50 GMT

Hi,
Use a Profiler to show you exactly where time is spent.

Yoav Shapira
Millennium Research Informatics


>-----Original Message-----
>From: Allistair Crossley [mailto:Allistair.Crossley@QAS.com]
>Sent: Sunday, April 11, 2004 3:51 PM
>To: tomcat-user@jakarta.apache.org
>Subject: Tomcat and my application's performance ... time being lost?
>
>Hello Guys
>
>*sigh* I am trying to make my app work as quick as possible but look at
>these stats...
>
>Page name:                              page_6 page_7 page_8 page_9
page_10
>page_11
>Min web transaction (without images): 460.79 1962.42 2296.12 2881.90
>2660.72 1640.80
>Avg web transaction (without images): 3681.05 3637.22 3472.87 3935.36
>4368.14 3877.93
>Max web transaction (without images): 5425.64 5875.14 5977.36 6194.46
>7140.51 6557.30
>
>That's 20 users x 3 iterations. What is puzzling me is that I have
wrapped
>code-level timings around the very top entry point of the Struts action
and
>the very bottom. These timings are coming out at sub 0.5s. I also have
done
>the same in the top level template JSP that includes every page and the
>pages for the most part are timed at sub 0.4s.
>
>In general though add them together and I get sub 0.5s for execution of
>backend and frontend code.
>
>But look at the average transaction time above and 3+s is the best my
>Tomcat configuration is doing. I am beginning to suspect that this is
not
>to do with my application code if my timings are so fast??
>
>I suppose these type of timings are only for the running of the code
and do
>not cover the time it takes for the user click to the Action itself,
and
>also again for sending the page as a response stream?? Although the
timings
>show fast execution, does this include sending the response stream
itself -
>I don't think it does.
>
>I have tried this now on my home machine and 2 servers so I don't think
it
>is to do with network latency or anything like that. I am pretty sure
>something in the application is slowing down but I have timed pretty
much
>everything from database calls, page compilation and so fourth and it
is
>all ultra-fast...so where is my time going?
>
>--> User Click
> --> My Action Servlet extends Struts Action Servlet framework
>  --> Action Servlet calls Struts framwork I presume
>   --> Struts framework calls my BaseAction (this is what I time)
>    --> My Action class does it's work
>     --> my BaseAction returns (output total time here = sub 0.5s)
>      --> Struts/tiles handles sending JSP view to user
>       --> My template JSP is called by Struts (this is timed again <
0.4s)
>
>So if my code timings are really fast, then it could be Struts that is
>consuming the extra time?
>
>Advice on where can I turn next to determine the missing time is so
very
>much appreciated.
>
>ADC
>
>
>
>
>
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>-------------------------------------------------------
>QAS Ltd.
>Developers of QuickAddress Software
><a href="http://www.qas.com">www.qas.com</a>
>Registered in England: No 2582055
>Registered in Australia: No 082 851 474
>-------------------------------------------------------
></FONT>




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