Inter-program optimisations for disk energy reduction

Compiler support for power and energy management is effective in reducing power and energy consumption of programs. This work investigates the benefits of optimising sets of programs to reduce overall disk energy. Our validation experiments include physical measurements from two laptop disks. The experiments show that inter-program optimisations have significant energy savings over individually optimised programs. Energy savings ranged up to 49% and 82% over the individually optimised and unoptimised versions, respectively. Looking across both disks, the average energy savings over individually optimised and unoptimised versions were 25% and 65%, respectively.