Matt
Begin forwarded message:
From: "Benge, Todd" <[EMAIL PROTECTED]> Date: June 21, 2004 10:51:29 AM MDT To: <[EMAIL PROTECTED]> Subject: Display Tag Performance Enhancements
Hi Matt,
My name is Todd Benge. I’m the technical lead on a software project at Level 3 Communications. We’ve been using the display tag for roughly six months now for a number inventory system. We’ve found the feature set very rich and would like to thank you for the good product. The volume on our system has grown exponentially in the last few months and thus we began to notice a significant performance issue on our production servers. It’s not uncommon for our users to display and work with very large sets of tables – i.e. 5,000 to 10,000 rows. When profiling our performance problems, we noticed a significant amount of the CPU time was spent processing in the displaytag libraries, especially after to the upgrade to the 1.0 rc1 release. There are several steps we are taking to improve the overall system performance, one of which was to look at the displaytag source code. In doing so, we were able to make a couple of significant changes that have made a major impact on overall performance. So far the changes we’ve made have not had any impact on functionality but we do not use the el tags or velocity templates. We’ve tagged all of the changes in the source files with my name (Todd) so that you can evaluate the changes. The attached jar file includes the source files changed as well as the Borland Optimizeit profiles taken before and after the work was completed. You should see that the processing time spent in the tag libraries and main JSP is significantly reduced. This is mostly due to caching of previously reflected methods and the removal of the iteration in the doAfterBody of the TableTag. If the changes look reasonable, we’d be happy to commit the changes back to the community. The two authors of the changes are Todd Benge and Matt Green.
Just a side note, when I was looking for your email address I noticed you are originally from Bozeman, MT. I’m originally from Miles City, MT and went to school for my BS degree at Montana State.
Please feel free to contact me if you have any questions.
Thanks,
Todd
DisplayTagPerformanceChanges.jar
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