Michael, your mail is very informative. we have a very similar set up (4 Xeon processors 3.5 GB Ram and WIn2003 Standard edition) and hardpart is that we cant change this setup and switch to Linux. So what you told "Tomcat on Windows doesn't scale well" is bothering me
I heard about clustering on diferent boxes. Is the process of running multiple tomcats on a single machine will be same?? You talked about some "workarounds using esoteric registry keys", can you eloborate on this or tell me where I can get details about it and the details about limitations placed by windows2003 on a single process in terms of number of threads, memory etc. Thanks in advance. With regards Srikanth.P On 7/22/05, Michael Kleinhenz <[EMAIL PROTECTED]> wrote: > > > We're running an application on Tomcat that often hits the limit of > > 150 threads. Can someone with experience changing this value give me > > advice on it? How big can you make this number? How much extra memory > > do I need if I say change it to, say, 500? Thanks. > > just a few facts on threads in Tomcat: > > . you'll need (Xss*max_threads)+Xmx+x memory in your box, where x is > the memory needed by the basic JVM tasks besides the thread space > (say, 100MB). > > . on ia32/Windows, you can only assign 1.6GB (Xmx-)memory to a single > JVM. A value above it will break the 2GB barrier and will not run. > > . you need to find the balance between max_threads and Xmx. A lower Xmx > gives you a higher max_threads and vice versa. > > . Tomcat on Windows doesn't scale well. Use multiple Tomcat instances > on one box if you have a large box. In my setup, I run 4 Tomcats on a > 2xXeon system with 4GB memory. Each Tomcat gets 1000 threads and > 512MB. This is _much_ faster than a single Tomcat with all > memory and 4000 threads. > > . Windows 2003 Server, at least the Standard Edition has major > limitations in both TCP connections and memory. There are some > workarounds using esoteric registry keys, but none of them works > well. Windows is a crippled desktop os that wants to be on the > server. If you want really high performance on large boxes, use > Linux (Kernel 2.6!). You even get a better administration > interface. Hate this inefficient administration-by-clicking ;-) > > -- Michael > > -- > Dipl.-Technoinform Michael Kleinhenz > tarent GmbH . Bahnhofstraße 13 . 53123 Bonn > fon: +49 (228) / 52 67 5-0 > fax: +49 (228) / 52 67 5-25 > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
