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From Antonio Fiol BonnĂ­n <fiol.bon...@terra.es>
Subject Re: how to increase tomcat performance
Date Sun, 15 Feb 2004 08:35:30 GMT
Hi,

I am not Filip, but in my case most "hangings" were caused by too low 
settings of Tomcat's maxThreads / maxProcessors or too low setting for 
the database connections accepted.

And as Deepak says he is using Apache in front, I'd also check the 
Apache, just in case.

To check, wait for it to hang, and before stopping tomcat, execute on 
every machine involved:

netstat -n | grep SYN_RECV

If you see a large (more than 2-3) quantity of lines there, the involved 
service (local IP:port) is the blocking one.

SYN_SENT would be the counterpart of this. However, as you will not 
notice the hang immediately, it is unlikely that you see the SYN_SENT. 
If you do, blocking service is (remote IP:port).

Hope that helps.


Antonio Fiol



Parsons Technical Services wrote:

>Filip,
>
>Does this symptom sound similar to problems with memory leaks?
>
>Doug
>
>----- Original Message ----- 
>From: "Filip Hanik (lists)" <devlists@hanik.com>
>To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>; "Deepak Hegde"
><tomcat_support@rediffmail.com>
>Sent: Saturday, February 14, 2004 11:12 PM
>Subject: RE: how to increase tomcat performance
>
>
>  
>
>>first go over your configurations, make sure you have enabled enough
>>    
>>
>threads
>  
>
>>for the connectors (read docs)
>>
>>then get a performance profiler and go to work :)
>>
>>tomcat is pretty optimized, so it could be something in your code
>>
>>Filip
>>
>>
>>
>>-----Original Message-----
>>From: Deepak Hegde [mailto:tomcat_support@rediffmail.com]
>>Sent: Saturday, February 14, 2004 8:03 PM
>>To: tomcat-user@jakarta.apache.org
>>Subject: how to increase tomcat performance
>>
>>
>>Hi All,
>>
>>I am running Tomcat 4 and Apache 1.3 and Struts Framework on Sun Sparc
>>machine having O.S 5.8 version.
>>
>>Web application is developed to use Postgres Database also.
>>
>>I am facing lots of performance issues with Tomcat i.e sometimes when user
>>connection increases tomcat process hangs and website stops opening
>>
>>and some times it goes very slow. The Problem gets sloved when i restart
>>    
>>
>the
>  
>
>>tomcat service again.
>>
>>Somebody please help me ..
>>
>>Regards,
>>Deepak
>>    
>>


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