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From peter lin <peter....@labs.gte.com>
Subject Re: performance problem
Date Thu, 15 Aug 2002 12:02:57 GMT

before you go exploring other ideas, try jasper2 from the latest beta
4.1.9.

if you have nested tags, most likely you're suffering from jdk bug with
deeply nested try/catch. I would bother looking into other things until
you've atleast tried jasper2.

peter


Alessandro Di Maria wrote:
> 
> Hello!
> 
> I have extremly performance problem!
> 
> I send a http-request to Tomcat, which forwards the request over RMI to
> a business logic.
> This sends back a XML with the templates to include and values to place
> in the templates.
> 
> This process takes about 100 - 400ms (not very fast but ok)
> 
> After received the answer, Tomcat processes the XML via a few custom
> tags to include
> templates and write text values in this templates.
> 
> A small (3k) template needs about 500ms to display.
> A little bit larger one (9k), about 20 sec!!!!
> 
> For the time the HTML is created (resolving custom tags) , Tomcat is
> using 100% of the CPU!
> 
> Looking at my log files, it seems that the HttpProcessor-Thread on
> Tomcat is blocked
> by another tomcat thread. In intervalls of about 4sec the
> HttpProcessor-Thread can process a little
> bit of its code and than is blocked again.
> 
> Or tomcat is not able to hold the request object and writes it somewhere
> to disk.
> So every 4sec it has to read or write the information needed for this
> process to disk.
> Must I increment the cache for the context or the server? But where and how?
> 
> Here a snippet of my  log-file:
> 2002-08-14 15:49:36,403 DEBUG [HttpProcessor[8080][3]]
> obsession.juice.out CmsTag doStartTag - CurrentNode = [Element:
> <pers_klassifikation/>] looking for child [pers_klassifikation_item] 1 of 2
> 
> 2002-08-14 15:49:40,068 DEBUG [HttpProcessor[8080][3]]
> obsession.juice.out SelectTag getOutputText - looking for parent
> 
> the JSP-Code involved in this 4 sec:
> ....
> <tr>
>         <td><cms:text name="pers_klassifikation" data="name"/></td>
>         <td>
>         <select size="1" class="long" name="<cms:text
> name="pers_klassifikation" data="parameter"/>">
>         <cms:enter_area name="pers_klassifikation">
>             <cms:area name="pers_klassifikation_item">
>             <option value="<cms:text name="pers_klassifikation_item"
> data="value"/>" <cms:select name="pers_klassifikation_item"
> output="selected"/>><cms:text name="pers_klassifikation_item"/></option>
>             </cms:area>
>         </cms:enter_area>
>         </select>
>         </td>
> </tr>
> ....
> 
> the XML needed to populate the custom tags:
> 
> <pers_klassifikation name="Klassifikation"
> parameter="fk_klassifikation_id" validate="int" range="1:100"
> mandatory="0" id="44" value="2">
>   <pers_klassifikation_item value="1">Lead</pers_klassifikation_item>
>   <pers_klassifikation_item value="2">Honorar</pers_klassifikation_item>
> </pers_klassifikation>
> 
> 4sec to know if the <option> tag is selected or not!
> 
> Libraries involved jdom.jar and log4j.jar
> 
> Using Tomcat 4.0.3, Java 1.3 on Windows2000 and Linux Debian as well.
> 
> Thx for any help
> Alessandro
> 
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