[Building Sakai] Sakai memory

[Jon Wheat]

Have a question for you all - 
Our Sakai box has 4G of RAM - we have approx 3000 students, and it gets used constantly - to the point we have a  no window to do upgrades without having to alert everyone (and still they get upset when its down for a little bit). 

That said - what is the recommended amount of memory?  I'm thinking 4G is way too little. 

Watching 'top' I see the java cpu process hit 100% then back down, then up in the 80s and back. When this happens, is this a memory problem or something else more serious? 

guess that's two questions. 

thanks, 
-Jon 
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