-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Pid,
On 4/1/2011 6:43 AM, Pid wrote: > On 01/04/2011 06:58, Kaushal Shriyan wrote: >> Hi, >> >> What are the implications or issues if maxThreads are increased from the >> default 150 to 300 threads. Are there any performance issues ? > > Yes, may be at risk of improving performance. Hah. Seriously, to the OP: if your webapp under load is not really using the CPU or network much (that is, you're waiting on some other resource) and still taking a long time to service requests, then increasing the number of connections is likely to /slow your webapp down/ because you will be putting more strain on those already-taxed resources. On the other hand, if your webapp under load is using a lot of CPU time, then you will also experience a slowdown because you'll end up with more context switches to service all those requests PLUS you'll have more load on the CPU doing actual work. Finally, increasing the maxThreads will increase your memory requirements for two reasons: first, you'll need a stack for each thread to use (see your JVM's default or command-line switches for what that per-thread memory requirement is) PLUS you'll need the amount of memory that a typical request (or particularly memory-heavy request, if you want to be really safe) will use FOR EACH THREAD. The best thing to do is to load test your webapp and see what point your webapp stops responding in a reasonable amount of time (to be determined by your own requirements). If your response time is very fast and your server is using very little CPU, then you can increase the maxThreads until things start to become intolerable. Oh, and if you are using Tomcat behind some web server like Apache httpd, you might want to make sure that your value for maxThreads matches whatever configuration you have on the web server so that you can actually serve that many requests through to Tomcat. ;) - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk2V6rAACgkQ9CaO5/Lv0PCNYQCfUQ+KKMvNUbbsgI2jQ8DgfeoF 90EAoMKOwBIwrcsuv8LZsC5sRkXajcj/ =JaTv -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
