|
|
Power Aware Fault-Tolerance
Real-time systems with space constraints have tight low-power requirements
and must operate correctly in the presence of faults. This provides the
motivation to explore the relationship between fault tolerance techniques
and energy consumption. In particular, we establish the energy efficiency
of Application Level Fault Tolerance (ALFT) schemes over other software-based
fault tolerance methods. In ALFT, task sets consist of primary and secondary
tasks. Secondary tasks may be identical to the primary tasks or they can
be a scaled down version of the primary tasks. We developed sensible energy-aware
heuristics for ALFT schemes which either schedule the primary copies as
early as possible or the secondary copies as late as possible. In the
steady-state fault-free case, the heuristics decrease the need to run
the secondary copies which result in up to 40% energy savings. Parts of
this research appear in the 2002 International Symposium on Low Power
Electronics and Design (ISLPED 2002)
 |
|
