On Tue, Jan 27, 2009 at 8:57 AM, Thorsten Scherler <thorsten.scherler....@juntadeandalucia.es> wrote: > Hi all, > > I am running out of ideas why the dispatcher rewrite is not faster then > the old one we have. > > The old dispatcher is around 10% faster and consumes less memory (!!!) > then the new one. The new one is using AXIOM to create the final > document which supposed to be faster then DOM, but it is not. > > I switch the contract processing from DOM to AXIOM to finally have SAX. > > Some sidenotes of my profiling sessions: > - we use as testing ground a dedicated linux box which is basically a > replica of http://juntadeandalucia.es/index.html > - the side is made with cocoon 2.2 and "old" dispatcher cocoon 2.2 block > (which is the same as we use here in forrest projects). > - The app is running on a tomcat6 and java6. > - We using jmeter to have an incremental test run on concurrent threads > (starting with 5 to 90 concurrent threads). > > Jmeter says for 90 threads that we have a throughput of 70 threads/sec > with the old one but only 60 threads/sec with the new one. > > The max memory for the 90 threads are 65 MB for the old one and the new > one is using 5 MB more. > > The total amount of class instances have been around 12.000 in the old > and in the new around 15.000. > > Somebody has any idea I would really appreciate some suggestions, I do > not understand why the new one is not significantly faster and resource > friendlier.
I have no clue really, just some thoughts. On a side note, if there's an easy way for me to setup the same test here, maybe I could help more. Assuming I use the rewrite_branch, what site should I set up? Have you benchmarked the parsers independent of the dispatcher framework? Maybe its simply a case of the assumptions being wrong? AXIOM is specifically fast for small docs, right? Maybe yours are larger than the threshold in which AXIOM can be expected to outperform others? I haven't looked at AXIOM but maybe the higher memory is due to AXIOM being optimized for certain doc types/size? Maybe the dispatcher isn't wrong, is there a chance your expectations are? --tim
