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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