supporting 150,000 page views a day isn't a problem. I know first hand it can handle that kind of load. the bigger question is whether or not the design of the application will scale well for 1000 virtual hosts.
What I've done in the past is to get some sample traffic and then start testing a couple of machines with increasing load. That's really the only way to know how Tomcat should be tuned. For example, when I worked for Superpages.com I spent about 3 months testing and tuning. In my case, I had existing http logs, so I could take a sample of 1million requests and use it to simulate real traffic. I then compared the results against existing performance numbers. At the end, I could compare production performance vs a series of results with different heap settings. peter On 3/26/06, Serkan Durusoy [DNA - encoding the future] < [EMAIL PROTECTED]> wrote: > > Hello All, > > I am new to this mailing list, so please bare with (and warn) me if I fall > into a mistake. > > Here is our environment followed by my question: > > We are currently developing a hosted content management system (CMS) > solution using mainly JSP's and Java Classes. Our production environment > will be: > > > Tomcat 5.5.16 > > JDK 1.5.06 > > Windows 2003 Server Web Edition (for the time being, we are not > considering linux/unix - we just don't have experiences linux/unix system > administrators) > > MySQL 5.0.19 (MyISAM storage engine) > > The server machine consists of all Intel branded OEM hardware which sum up > to: > > Intel E7320 Chipset Server Motherboard > > Dual Xeon 3.0 CPU > > 4GB (4x1GB) ECC Ram > > Onboard RAID 1 or RAID 0 (we haven't decided between 0 and 1 yet - but > we > cannot have 10 or 0+1 or any other RAID configuration) > > 2 x 500GB SATAII NCQ Hard Drives > > Our system design implements an approach where there is only one > application > (hence only one document root / webapp) and only one database. > > Yet the number of web sites to be hosted on a single server is assumed to > be > around 1000. Hence, there is only one virtual host and there are 999 > Alias'es defined beneath that host. > > Index.jsp detects the URL entered in the browser (defined on our DNS as > pointed to our tomcat server) and assembles the page using static files > (images, CSS etc) and html content (stored on the database) for that > specific URL. We chose this approach to better utilize resources like > database connection pool etc. > > We are assuming 1,000 web sites (aliases) which will supposedly to handle > a > total of 150,000 page views daily. > > To simplify the suggested architecture, one may think of it as a large > dynamic web site with 100,000 pages (stored on DB) and 150,000 daily page > views. According to surveys and internet usage statistics in our country > (Turkey), our estimate of peak-time page views will be concentrated as > follows: > > > 18,000 hits/peak-hour > > I really do not have any basis (or real-life experience whatsoever) to > predict the number of concurrent requests (peak workload) to the server in > such an example. All I can give you (except if you have any questions that > I > might be able to answer) is that we will have a relatively large web site > with a relatively large amount of visitors. > > Here is my question: > > We have always used tomcat with its out-of-the-box configuration so we do > not have any experience on advanced configuration of Tomcat, nor do we > have > any experience in fine-tuning. You can safely assume that our application > and our database are tuned well. > > What are performance oriented configuration parameters on Tomcat? Where do > they reside in terms of configuration files, start-up parameters etc? What > would you suggest as values to those parameters in our case? > > I have come across with terms like max heap size (I guess this is JVM > related), max-buffer-length, max-threads, max-spare-threads and so on, but > I > really do not know what figures to change them to. > > I really do not have the luxury (or means) to play around with parameters > to > test and see what we will get, therefore I will really appreciate the > help. > All I need is someone suggest me an above-average (in terms of > performance) > Tomcat (and possibly JVM) configuration so that I will make sure our > server > won't be down on its first launch day. > > Kind regards, > > Serkan Durusoy > DNA Internet Cozumleri San. ve Tic. A.S. > [A] Gardenya Plaza 2 Kat:6 Atasehir - Istanbul - Turkey > [P] +90 216 456 4 156 > [F] +90 216 456 4 157 > [U] www.dna-tr.com > [E] [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
