hi,

I have checked issuing the same command netstat but it displays nothing.
also sometimes tomcat uses 70% of the CPU when this things happen.

Regards,
Deepak


On Sun, 15 Feb 2004 Antonio Fiol Bonnín wrote :
>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@(protected)>
>>To: "Tomcat Users List" <tomcat-user@(protected)"
>><tomcat_support@(protected)>
>>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@(protected)]
>>>Sent: Saturday, February 14, 2004 8:03 PM
>>>To: tomcat-user@(protected)
>>>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
>>>  
>