jsvc degrades performance in production

["B.V. Prasad" <hi...@yahoo.com>]

I am running Tomcat 6 on a group of Linux servers behind a loadbalancer. This setup was working fine when I ran Tomcat as root. However, when I moved to jsvc, the production servers started to become unavailable within a couple of hours, serving thousands of requests. I had to restart them to be online again, only to get into the same issue in a couple of hours. When switched back to run as root, things were fine again. I could find no errors in any logs.

I found that jsvc uses client JVM (the servers are server-class VMWare servers) by default. I am suspecting when I ran as root (startup.sh), Tomcat used server JVM that gave better performance, while jsvc performed worse with client JVM, causing my maxThreads (150) to exhaust, acceptCount (100) to fill up and making tomcat to deny requests. I am guessing if I make jsvc to use server JVM, my problem will go away. I appreciate if someone can validate this theory or offer other clues before I try this in production. Of course, I shall also try a stress test case.

Thanks,
BV Prasad


      

Re: jsvc degrades performance in production

[Leon Rosenberg <ro...@googlemail.com>]

just a question, if you are behind a loadbalancer, why wouldn't your
just run it as non-root user on a non-privelleged port without jsvc?

regards
Leon

On Thu, Feb 26, 2009 at 3:31 AM, B.V. Prasad <hi...@yahoo.com> wrote:
> I am running Tomcat 6 on a group of Linux servers behind a loadbalancer. This setup was working fine when I ran Tomcat as root. However, when I moved to jsvc, the production servers started to become unavailable within a couple of hours, serving thousands of requests. I had to restart them to be online again, only to get into the same issue in a couple of hours. When switched back to run as root, things were fine again. I could find no errors in any logs.
>
> I found that jsvc uses client JVM (the servers are server-class VMWare servers) by default. I am suspecting when I ran as root (startup.sh), Tomcat used server JVM that gave better performance, while jsvc performed worse with client JVM, causing my maxThreads (150) to exhaust, acceptCount (100) to fill up and making tomcat to deny requests. I am guessing if I make jsvc to use server JVM, my problem will go away. I appreciate if someone can validate this theory or offer other clues before I try this in production. Of course, I shall also try a stress test case.
>
> Thanks,
> BV Prasad
>
>
>

---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org