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Posted to taglibs-user@tomcat.apache.org by "Richard Mixon (qwest)" <rn...@custco.biz> on 2003/09/21 06:32:29 UTC
JSTL startup times - is caching going on?
I am having an issue with large startup times the first time one of my pages runs that uses JSTL mostly the core library. Subsequent
requests (even for different users on different data) take much, much less time.
Here is a little more detail. Any ideas are much appreciated. My ISP is pretty irate because we suck up huge amounts of CPU each
time it happens.
We are using Tomcat 4.1.24, Java 1.4.1 and Struts 1.1.
OK, the page uses a couple of nested foreach loops to generate a grid/chart of SVG markup language. It also uses a couple of small
foreach loops to generate tick marks on an axis. It looks something like:
Chart page
<embed> tag
include JSP/JSTL page to generate footer.
include JSP/JSTL page to generate x and y axis
JSTL markup to generate main body of chart
include JSP/JSTL page to generate footer.
The request takes a half second to build the Java objects that the JSTL code uses to render on the page. But the rendering takes 45
second on a 650MHZ Sun SPARC III machine and almost that long on a fast Windows machine (2500 MHZ).
The second and subsequent times the chart rendering drops down to less than 200 milliseconds. Then about five minutes later, if the
chart is requested again, it takes the 45 seconds to generate, then 200 milliseconds for subsequent requests.
Thanks - Richard
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RE: JSTL startup times - is caching going on?
Posted by "Richard Mixon (qwest)" <rn...@custco.biz>.
Henri, thanks for the response.
Yes, Tomcat 4.1 will pool objects created by custom taglibs - so this could be it. But I would sure like to be able to adjust the
time the objects are pooled, so they stick around a little longer.
I am generating the SVG from our domain model (just summarized Java objects). Some of the charts we do are unlike any that I've seen
in the frameworks. But I do not remember looking at Cewolf JFreeChart, I just located it on SourceForge. We rolled our own because
the scatter diagrams and line charts are a little different that most charting packages support, but I would love to have a
framework I did not have to maintain alone.
Thanks again.
-----Original Message-----
From: Henri Yandell [mailto:bayard@generationjava.com]
Sent: Saturday, September 20, 2003 10:45 PM
To: Tag Libraries Users List
Subject: Re: JSTL startup times - is caching going on?
The JSP spec for Tomcat 4.1 does say that a container may cache Tag
objects between page runs. It sounds like this could be what's happening
here. I've no idea whether it would cache across sessions etc. Up to the
server and not the taglib.
On the speed issue. What are you using to create the SVG? And where does
it get the data?
Off-topic: I've been having fun with the Cewolf JFreeChart library and
it's pretty nifty.
Hen
On Sat, 20 Sep 2003, Richard Mixon (qwest) wrote:
> I am having an issue with large startup times the first time one of my
> pages runs that uses JSTL mostly the core library. Subsequent requests
> (even for different users on different data) take much, much less time.
>
> Here is a little more detail. Any ideas are much appreciated. My ISP is
> pretty irate because we suck up huge amounts of CPU each time it
> happens.
>
> We are using Tomcat 4.1.24, Java 1.4.1 and Struts 1.1.
>
> OK, the page uses a couple of nested foreach loops to generate a
> grid/chart of SVG markup language. It also uses a couple of small
> foreach loops to generate tick marks on an axis. It looks something
> like:
>
> Chart page
> <embed> tag
> include JSP/JSTL page to generate footer.
> include JSP/JSTL page to generate x and y axis
> JSTL markup to generate main body of chart
> include JSP/JSTL page to generate footer.
>
> The request takes a half second to build the Java objects that the JSTL
> code uses to render on the page. But the rendering takes 45 second on a
> 650MHZ Sun SPARC III machine and almost that long on a fast Windows
> machine (2500 MHZ).
>
> The second and subsequent times the chart rendering drops down to less
> than 200 milliseconds. Then about five minutes later, if the chart is
> requested again, it takes the 45 seconds to generate, then 200
> milliseconds for subsequent requests.
>
> Thanks - Richard
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RE: JSTL startup times - is caching going on?
Posted by "Richard Mixon (qwest)" <rn...@custco.biz>.
Henri, thanks for the response.
Yes, Tomcat 4.1 will pool objects created by custom taglibs - so this could be it. But I would sure like to be able to adjust the
time the objects are pooled, so they stick around a little longer.
I am generating the SVG from our domain model (just summarized Java objects). Some of the charts we do are unlike any that I've seen
in the frameworks. But I do not remember looking at Cewolf JFreeChart, I just located it on SourceForge. We rolled our own because
the scatter diagrams and line charts are a little different that most charting packages support, but I would love to have a
framework I did not have to maintain alone.
Thanks again.
-----Original Message-----
From: Henri Yandell [mailto:bayard@generationjava.com]
Sent: Saturday, September 20, 2003 10:45 PM
To: Tag Libraries Users List
Subject: Re: JSTL startup times - is caching going on?
The JSP spec for Tomcat 4.1 does say that a container may cache Tag
objects between page runs. It sounds like this could be what's happening
here. I've no idea whether it would cache across sessions etc. Up to the
server and not the taglib.
On the speed issue. What are you using to create the SVG? And where does
it get the data?
Off-topic: I've been having fun with the Cewolf JFreeChart library and
it's pretty nifty.
Hen
On Sat, 20 Sep 2003, Richard Mixon (qwest) wrote:
> I am having an issue with large startup times the first time one of my
> pages runs that uses JSTL mostly the core library. Subsequent requests
> (even for different users on different data) take much, much less time.
>
> Here is a little more detail. Any ideas are much appreciated. My ISP is
> pretty irate because we suck up huge amounts of CPU each time it
> happens.
>
> We are using Tomcat 4.1.24, Java 1.4.1 and Struts 1.1.
>
> OK, the page uses a couple of nested foreach loops to generate a
> grid/chart of SVG markup language. It also uses a couple of small
> foreach loops to generate tick marks on an axis. It looks something
> like:
>
> Chart page
> <embed> tag
> include JSP/JSTL page to generate footer.
> include JSP/JSTL page to generate x and y axis
> JSTL markup to generate main body of chart
> include JSP/JSTL page to generate footer.
>
> The request takes a half second to build the Java objects that the JSTL
> code uses to render on the page. But the rendering takes 45 second on a
> 650MHZ Sun SPARC III machine and almost that long on a fast Windows
> machine (2500 MHZ).
>
> The second and subsequent times the chart rendering drops down to less
> than 200 milliseconds. Then about five minutes later, if the chart is
> requested again, it takes the 45 seconds to generate, then 200
> milliseconds for subsequent requests.
>
> Thanks - Richard
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---------------------------------------------------------------------
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Re: JSTL startup times - is caching going on?
Posted by Henri Yandell <ba...@generationjava.com>.
The JSP spec for Tomcat 4.1 does say that a container may cache Tag
objects between page runs. It sounds like this could be what's happening
here. I've no idea whether it would cache across sessions etc. Up to the
server and not the taglib.
On the speed issue. What are you using to create the SVG? And where does
it get the data?
Off-topic: I've been having fun with the Cewolf JFreeChart library and
it's pretty nifty.
Hen
On Sat, 20 Sep 2003, Richard Mixon (qwest) wrote:
> I am having an issue with large startup times the first time one of my
> pages runs that uses JSTL mostly the core library. Subsequent requests
> (even for different users on different data) take much, much less time.
>
> Here is a little more detail. Any ideas are much appreciated. My ISP is
> pretty irate because we suck up huge amounts of CPU each time it
> happens.
>
> We are using Tomcat 4.1.24, Java 1.4.1 and Struts 1.1.
>
> OK, the page uses a couple of nested foreach loops to generate a
> grid/chart of SVG markup language. It also uses a couple of small
> foreach loops to generate tick marks on an axis. It looks something
> like:
>
> Chart page
> <embed> tag
> include JSP/JSTL page to generate footer.
> include JSP/JSTL page to generate x and y axis
> JSTL markup to generate main body of chart
> include JSP/JSTL page to generate footer.
>
> The request takes a half second to build the Java objects that the JSTL
> code uses to render on the page. But the rendering takes 45 second on a
> 650MHZ Sun SPARC III machine and almost that long on a fast Windows
> machine (2500 MHZ).
>
> The second and subsequent times the chart rendering drops down to less
> than 200 milliseconds. Then about five minutes later, if the chart is
> requested again, it takes the 45 seconds to generate, then 200
> milliseconds for subsequent requests.
>
> Thanks - Richard
Re: JSTL startup times - is caching going on?
Posted by Henri Yandell <ba...@generationjava.com>.
The JSP spec for Tomcat 4.1 does say that a container may cache Tag
objects between page runs. It sounds like this could be what's happening
here. I've no idea whether it would cache across sessions etc. Up to the
server and not the taglib.
On the speed issue. What are you using to create the SVG? And where does
it get the data?
Off-topic: I've been having fun with the Cewolf JFreeChart library and
it's pretty nifty.
Hen
On Sat, 20 Sep 2003, Richard Mixon (qwest) wrote:
> I am having an issue with large startup times the first time one of my
> pages runs that uses JSTL mostly the core library. Subsequent requests
> (even for different users on different data) take much, much less time.
>
> Here is a little more detail. Any ideas are much appreciated. My ISP is
> pretty irate because we suck up huge amounts of CPU each time it
> happens.
>
> We are using Tomcat 4.1.24, Java 1.4.1 and Struts 1.1.
>
> OK, the page uses a couple of nested foreach loops to generate a
> grid/chart of SVG markup language. It also uses a couple of small
> foreach loops to generate tick marks on an axis. It looks something
> like:
>
> Chart page
> <embed> tag
> include JSP/JSTL page to generate footer.
> include JSP/JSTL page to generate x and y axis
> JSTL markup to generate main body of chart
> include JSP/JSTL page to generate footer.
>
> The request takes a half second to build the Java objects that the JSTL
> code uses to render on the page. But the rendering takes 45 second on a
> 650MHZ Sun SPARC III machine and almost that long on a fast Windows
> machine (2500 MHZ).
>
> The second and subsequent times the chart rendering drops down to less
> than 200 milliseconds. Then about five minutes later, if the chart is
> requested again, it takes the 45 seconds to generate, then 200
> milliseconds for subsequent requests.
>
> Thanks - Richard
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