On Mon, Dec 22, 2008 at 7:05 PM, Chris Stewart <cstewart...@gmail.com> wrote: > We've been running into some issues lately with our Tomcat 6 instances where > performance will slow to a crawl. Unfortunately, no error messages are > present in the logs and we really don't know why this is happening. It does > appear that the issue is happening when we get "a lot" of users on the > system at one time. It would make sense, but we're only talking about 300 > or so concurrent users. There must be a point of misconfiguration on our > part but none of us really have any experience with Tomcat outside of simply > setting it up and running it out of the box, which isn't much. So, that > leads me to why I'm posting to the user list: > > 1. Are there any tools or utilities we can use to get an understanding of > what Tomcat is doing while it's running (processes, memory per process, and > more)?
there is only one true tool to measure application performance, and this is, ta-dam, moskito (everything else is for monitoring tomcat or jvm, but not the application). Have a look at http://moskito.anotheria.net/moskitodemo/mui/mskShowAllProducers Btw, we had a similar issue some time ago, because one of the spaces of the gc was running full (old gen due to a memory leak - thanx to chuck for help). Moskito can now show you the space usage in a graphable way ootb, maybe you should try it. Otherwise feel free to contact, since the tool is rather bad documented and truly complex. > > 2. I suspect there are some very large Tomcat installations out there. Has > any information from those installations been published? Is there a guide > or set of documentation on how to scale with Tomcat as a web server? Well ... no? I don't know, one of my customers has a peak load of 7-8K requests per second, is that huge? Without knowing what the requests are doing - hard to tell. But there are few large systems out there and even less of them are well managed, and probably none documented... You should look for someone who has done it before and can understand your specific application... regards Leon --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
