Try to make kill -QUIT on the tomcat process. This will make a thread dump. Most probaly the Thread dum will appear in the catalina.out
Check there to see if some of your threads are halting in some point in your code. Pavle -----Original Message----- From: Antonio Fiol Bonnэn [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 26, 2004 8:35 AM To: Tomcat Users List Subject: Re: Tomcat 4.1.30 Hung!!! With High Traffic Innovest Ken wrote: >I only use tomcat, without using Apache... Because my >site are mainly jsp. > >Yes, I have a script to kill the tomcat server before >starting again. And yes, I saw the 'All threads(150) >are busy' error message. > >Innovest > > As Denise said, you seem to be maxing out your threads. Possible reasons include, but are most likely not limited to: - Too high load. --- Check with "netstat -n --tcp" if there are about so many (150) ESTABLISHED connections. If so, your load is too high. If not, suspect on servlets taking too long to respond and clients going away. - Servlet instances not finishing execution of doGet or doPost or whatever. --- Trace their starts and ends (possibly using a filter), and detect whether the number of "still executing" servlets is steadily increasing or not. If so, it will raise 150 and then you'll start getting errors and Tomcat will start not responding. The thread dump should tell you where the processors are stuck. Most of them in the same place? Then you know where to look at. - Database connections not working properly because of the firewall. --- Not only you have to check that your app is using connections properly, but also that your firewall does not drop them. There are some properties for DBCP (testWhileIdle, validationQuery, and all the eviction series, which I do not remember off-hand) that will help you attack this problem. Set testWhileIdle, and make it test connections every so often (say 3-5 minutes). Use a very simple query like "SELECT 1 FROM DUAL" (Oracle) or "SELECT 1" (others that support it). This will refresh your firewall's activity maps. Also check that your firewall supports as many concurrent conenctions traversing it as you have (more than likely it does, but would be fatal if it does not). HTH, Antonio Fiol --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
