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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33650] New: - Jasper performance for multiple files processing
Date Sat, 19 Feb 2005 09:36:43 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33650

           Summary: Jasper performance for multiple files processing
           Product: Tomcat 5
           Version: 5.0.30
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Jasper
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: sbailliez@apache.org


Jasper performance is abysmal when using jspc to precompiles jsps, or more 
especially to generate the java files.

I have a webapp with 450 jsps, jasper generates the java files in 12 minutes. 
In comparison, javac compilation for those 450 generated java files is 
performed in 1 minute.

Profiling and debugging the code, it appears clearly that most of the time is 
spent doing the same parsing for static include directives over and over.

Typically a page includes an init page which itself includes 2 init pages.
page.jsp -> init.jsp -> { init-a.jsp, init-b.jsp, ... }

For each and every page, the parser always go down the tree without caching 
includes and parse init.jsp, and so on. So basically the init.jsp is parsed 
450 times.

The Mark object is also pretty inefficient as it generates bazillions of 
objects which are not so lightweight (via Mark.mark()).

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