On Sun, 2009-02-08 at 15:42 -0500, Tim Williams wrote: > 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.
Thank you Tim, I really appreciate them! > 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? Actually I have set up a some wars to make it easier to test see for some details https://issues.apache.org/jira/browse/FOR-1157 Basically https://svn.apache.org/repos/asf/forrest/branches/dispatcher_rewrite/FOR-1157/ has two different wars. > 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? Not sure I had the perception that it should be faster for bigger docs. However I am getting your point. > 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? I understand your point and you are completely right in saying that some parser are optimized to "certain doc types/size". However the only thing that I cannot explain myself is what I comment in the issue: "Like you see even if the new transformer is not used at all we are loosing around 10 requests per second." salu2 -- Thorsten Scherler <thorsten.at.apache.org> Open Source Java <consulting, training and solutions> Sociedad Andaluza para el Desarrollo de la Sociedad de la Información, S.A.U. (SADESI)
