these were all JSTL tags. Back when I ran the tests, I posted some of the results. I did tests that were synthetic, ie out 100 JSTL out tags in one page. Others were based on an actual page layout with lots of markup logic that use jstl <c:choose> in conjunction with jslt xml tags. the tests were with tomcat 4.1's jasper2 and with 4.0x jasper1. obviously the tag pooling was only with jasper2. I didn't have time to test tomcat 3.x tag pooling. peter lin Costin Manolache <[EMAIL PROTECTED]> wrote:Peter Lin wrote:
> > > I haven't read all the posts on this discussion, but here's some facts > from personal observations. > for pages with only a few tags, ie less than 30, tag pooling doesn't help. > On the otherhand, if your page has 100+ tags, it improves performance. > Some of the pages I benchmarked with had about 135 tags. In those > situations, I saw a 20-50% improvement. I would argue that sites that > don't have a lot of load should simply turn off tag pooling. Site that > use tags extensively and get 1millions page views a day, will gain > significantly from tag pooling. Is this based on the current tag pool implementation in jasper2 ? Because it is pretty clear that the tag pool has few problems. I would say the nature of the tags will also have a big impact. If your tag is very simple - you'll probably get some "small" benefits under load ( 20..30% ?). If the tag uses internal data structures, buffers, etc - it's very likely you'll see more ( since creating each tag instance will also create the additional hashtable, StringBuffers, etc ). I would bet that with complex tags that are specifically written to take advantage of the recycling you would see at least 2x better performance ( with a good sync-free and large enough tag pool ). If your tag is using any buffers or complex/expensive data structures that can be recycled - you'll save a lot. I don't think the number of tags in a page is too important - even if you have 1 complex tag - with 100 concurent users - you should see a difference. In an ideal world, all "core" tags would be recyclable and garbage-free - that may allow them to run at comparable speed with a hard-coded page. Costin --------------------------------- Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now
