On 29/12/2009 16:17, assan alhamoud wrote: > Hello Mark , > > we are using apache Server version: Apache/2.2.11 (Unix) > we use mod_jk.so module > jboss-3.2.5 > Tomcat5 > and jrockit-jdk1.4.2_19 > > at your disposal if you need more information
Are you using Tomcat or JBoss? Tomcat version? mod_jk version? Mark > > Regards, > Ghassan > > 2009/12/29 Mark Thomas <ma...@apache.org> > >> On 29/12/2009 15:21, assan alhamoud wrote: >>> Hello All >>> >>> I have some questions and I hope to find answers about Load balancing . >>> >>> 1- The first question , our DBA says that it not normal and no logic to >>> have several instances of tomcat server on the same machine with the >> same >>> configuration , is this correct ? >> No. Your DBA is wrong. >> >>> 2- Each tomcat instance here can serve about 125 user , and I have more >> than >>> this number on the server I got alot of problems and usually the >> instance >>> hang , is there anyway to get better performance from tomcat. >> That isn't a Tomcat problem, that is an application problem. The >> solution is to fix/tune your application. >> >>> I am using now 3G memory for each instance and 120 for max_pool_size >> and >>> 750 maxThread >> It isn't clear what the 125 users refers to. Is it concurrent requests, >> is it concurrent sessions, is it concurrent users (assuming 1 concurrent >> user == more than 1 concurrent request). From these numbers the >> application seems very resource intensive. It does appear that it would >> benefit from some tuning. >> >>> 3- The most critical issue I had , when one instance hangs , apache >> hangs >>> and then all the application hangs because apache keep trying to connect >> to >>> the hanged instance , Is there any way to force apache to bypass the >> hanged >>> instance. >> Yes. But since you haven't told us the Tomcat version, httpd version nor >> how you are connecting httpd to Tomcat we can't tell you how to fix it. >> >>> 4- When instance of tomcat hangs , i forced to restart this instance ( >>> tomcat server ) the problem is GC can not free memory anymore >>> Is there anyway to solve the problem instead of restarting the >> server. >> Yes. Work out if you have a memory leak or need more memory than is >> available. If it is a memory leak, fix it. If you need more memory >> either allocate it or tune your app so it uses less. >> >>> 5- at last sometimes I found that the same action repeated many times >> which >>> means that apache sends the request more than one time to tomcat server >>> ,could I have control over this behavior. >> Maybe, maybe not. If this behaviour is initiated by the user agent you >> need to manage this in your app. It could also be caused by the >> fail-over mechanism, in which case I refer you to my answer to point 3 >> above. >> >> Mark >> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> >> > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
