I just wanted to follow up on a comment I posted a couple of years ago
a monitoring too I wrote awhile back called collectl that can monitor just
about anything any of the common linux tools do while providing a
user interface. In fact, on the topic of memory, it also can show slab
and buddy info.
And if you really like ganglia you can pass anything to it collectl can
collect, not via some whimpy shell interfaces that always have too much
overhead, but via sockets for almost not overhead. That's why the folks at
PNNL use collectl on their 2300 node cluster as their ganglia monitoring
But that's not why I'm posting this but rather to let people know I've
recently released a set of utilities that add graphics to collectl. You
either generate plots from previously gathered data OR do it in real-time.
To read more, check out http://collectl-utils.sourceforge.net