On 25 Jan 2012, at 12:53, Mark Thomas <ma...@apache.org> wrote: > On 25/01/2012 11:45, Celso Magalhães Dantas Neto wrote: >> Hey everyone! >> >> Does anyone knows where I can find any information about Tomcat memory >> requirements? > > Tomcat needs less than 20MB to start up. Everything after that depends > on the application and the load level. > >> Here's the problem: I got a client who's running a Tomcat process in his >> machine and it is taking around 150MB of RAM and he is complaining about >> it. It's a webapp and for me it's normal to a webapp to take that amount of >> memory, but I want to argue with him with some data. > > I have seen Tomcat running on JVMs with memory settings ranging from > 32MB to 8GB. 150MB isn't unreasonable at first glance but it all depends > on the app. > >> So I'm looking for some Tomcat memory requirements info, even if it's a >> memory requirements to run Tomcat only, with no deployed webapp. It will >> help me to argue with him. > > See above. The Tomcat only figure is less than 20MB.
And of this, a Tomcat instance with just the ROOT application can be observed to consume from ~6Mb to ~10Mb of RAM in the object heap with a nice stable sawtooth on most systems. VisualVM connected to Tomcat will provide you with a nice graph demonstrating this, which you can compare to a graph from the customers application. p > You'll need to use a profiler to determine where the memory is actually > used. > > Also note that there is a low memory usage/ low GC pause / high > throughput trade-off. Very simply you can pick any two at the expense of > the third. > > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
