From last time
Monday, May 03, 2010
11:04 AM
From last time
Total power required to run an infrastructure is a linear function of the power the hardware requires…
… but is up to 2.5x that cost…
power requirements for an idle computer are less than requirements for doing work with it....
power requirements within CPU are small. 
memory accesses use power.
disk access use power.
context switching costs power…
so thrashing costs power…
optimal schedule involves no context switches...
but deadlines make that impractical…