MEMPHYS vs MEMACT?

Hello all,

I'm trying to understand the machine memory graphs -- specifically the differences between MEMPHYS and MEMACT (or "actual" and "real" on the graphs).

Is this pretty much straight from vmstat? e.g. Is "actual" the "active" memory from vmstat and "real" the total - free?

I recall seeing information on this weeks ago, but my GoogleFu (and Google Desktop) fails me today.

Thanks,

-- Dewey **