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 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 > > -- وداعاً ميخائيل
