This is what I ususally set the sizing on:
- 1method server/CPU core (not socket)
- Each methodserver can handle about 10 to 20 heavy users
- each methodserver is set with a min memory of -Xms768m and max memory range from -Xmx3968m to -Xmx6656m.
- Start with a minimum of 3 foreground and 3 backgroud (6 total).
- Thus you are going to need a minimum of 2Xhttp://en.wikipedia.org/wiki/Multi-core_processor)
- you can add more foreground methodservers if you have enough free memory during peak operation. The more methodservers reduces the load across all.
- tomcat will be set at the same memory settings of -Xms768m and max memory range from -Xmx3968m to -Xmx6656m
- Don't set the min and max to the same max value. That is over allocation and with multiple users and methodservers, not all methodservers will demand the max memory all the time.
- So you can start with 48 GIG of memory perferably PC3. it makes a huge difference.
- Running on a Red Hat Linux is the best platform. Tried Windows and others like Sun, HP-UX, HP-UX itanium, etc.
- place your kernal or OS configuration like oracle.
Have the same machine for your database with the same memory with a 40% allocation of memory.
Have a separate machine you Windows 2008 R2 64bit multiple CAD worker. This is a must to have a ratio of 1 CAD worker per 10 CAD users. Thus, you need the 2 additional background methodservers for WVS1 and WVS2.
It also depends of the java version, hopefully close to latest is good.
Always use somelike appdynamics.com to monitor and issolate the issue. Saves on consulting and provides constant monitoring. You can use top but you will have to try to load your system at that instant.
Good luck,
Patrick
