Hi, Thanks a bunch for your reply. I learned yet another new thing :)
I think my problem lied in my program's usage of sessions accessing Jackrabbit. I had a single session processing all the requests, but after reading a lot online, special thanks to this page: http://n4.nabble.com/Threads-in-jackrabbit-application-td520034.html#a520034 I learned that each thread should have its own session. I made the changes and the performance shot up very significantly. I used to be able to add/update/query Jackrabbit with about 300-500 requests (over 5 minutes) and it would come to a halt. Now I was able to perform 7,200 operations (over about 40 minutes) and it was still up and running (no glitches felt). I still need to run longer and harsher tests on the application but I feel a lot more confident in its performance. Thanks again for your help, Rokham Paul PODGORSEK wrote: > > > > > > > > Hi, > > Have you tried launching your server in debug mode? Can you monitor how > many threads are running at the same time? > Could you also send your repository configuration please? > > I have had the same kind of symptoms with one of my apps due to > synchronized methods in the AbstractBundlePersistenceManager class (too > many threads were waiting to acquire a lock). The CPU wasn't used very > much, as most threads were only waiting for their lock. I finally got > round this problem by using a second cache level (with ehcache). > If you indeed have the same kind of issue, you will probably have problems > because you are often writing in the repository, not only reading. Maybe > someone else on this mailing list could help you out for that? > > Hope that helps. > > Regards, > Paul. > >> Date: Wed, 11 Nov 2009 19:27:47 -0800 >> From: [email protected] >> To: [email protected] >> Subject: Re: Tomcat stops responding due to too many requests - using >> Jackrabbit >> >> >> Note that all these requests are WRITING to Jackrabbit. I also just >> came >> across this article, claiming that "Jackrabbit isn’t actually able to >> handle >> concurrent queries well". >> >> Does this mean I should move away from Jackrabbit? >> >> rokham wrote: >> > >> > Hi, >> > >> > I've written a web application using Jackrabbit. I have Tomcat as my >> web >> > server and I'm having a strange problem when a large number of requests >> > are sent to Tomcat simultaneously. >> > >> > Here's the scenario: >> > >> > When I have about 7 people accessing the server and sending about 10-15 >> > requests at a time, the server starts off very strong and keeps going >> for >> > about 5 minutes (Each of the 7 people sends 3-4 batches of requests >> over >> > those 5 minutes. This means in 5 minutes we have 7 people sending about >> 50 >> > requests each. Therefore a total of 350 requests). After the 5 minutes >> the >> > sever slows down and about 2-3 minutes after doing the same routine, >> > Tomcat stops responding. >> > >> > I was monitoring the system and the CPU was calm and the memory was >> > running at about 100 MB. But it's really strange that Tomcat stops >> > responding even though the server is not doing anything. And it's not >> like >> > the request has timed out. No error msg or anything is sent back from >> > Tomcat. >> > >> > I'm using Jackrabbit as my DB and I'm having a really hard time >> spotting >> > the problem. I don't know if I need to tweak tomcat's configs, or >> > something in Jackrabbit or is it something with Tomcat and Jackrabbit >> > talking to each other, that I need to know about. >> > >> > I came across the post below and the line saying It is caused by an in >> > accessible data base. made me wonder if there's a glitch between >> tomcat >> > and jackrabbit. >> > >> http://www.mail-archive.com/[email protected]/msg158745.html >> > >> > Thank you in advance. Any help is much appreciated, since I need to >> have >> > the system ready in a week. >> > >> > >> > >> >> -- >> View this message in context: >> http://n4.nabble.com/Tomcat-stops-responding-due-to-too-many-requests-using-Jackrabbit-tp605518p612788.html >> Sent from the Jackrabbit - Users mailing list archive at Nabble.com. > > _________________________________________________________________ > Tchattez en direct en en vidéo avec vos amis ! > http://www.windowslive.fr/messenger/ > -- View this message in context: http://n4.nabble.com/Tomcat-stops-responding-due-to-too-many-requests-using-Jackrabbit-tp605518p620750.html Sent from the Jackrabbit - Users mailing list archive at Nabble.com.
