Windows Vista Developing Power-Aware Applications.ppt

Windows Vista: Developing Power-Aware Applications Pat Stemen FUN319 Program Manager Core Platform Architecture Microsoft Corporation patste@ Agenda Windows Vista Power Management Goals Power-Aware Applications Handling Sleep Transitions Power versus Performance Integrating with Windows Power Policy Testing for Power Management Windows Vista Power Management Goals Simplify the user experience Enhance and extend power management usage models Improve the reliability of sleep transitions Predictable behavior Visibility into power management actions Extensive diagnostic tracing Enable maximum energy savings Mobile PC battery life Desktop power consumption Windows VistaMobile PC Pillars Power-Aware Applications To achieve power management goals, applications must be power-aware Designed and tested for power management Applications must handle sleep transitions seamlessly You can differentiate your application with power management features Handle power management events Scale behavior based on user’s power preference and state of the machine Integrate with Windows power policy Enabling Maximum PC Energy Savings Windows Vista will, by default, enable energy-saving features on all PCs Sleep is the default “off” behavior on both desktops and mobiles Desktop systems will have monitor blanking and sleep idle timeouts Aggressive power policy defaults for mobile PCs Windows Vista addresses the principle power management adoption blockers Removes need to be Administrator to change policy settings Supports Group Policy control of power settings Provides a rich power policy command-line tool Features reliable and deterministic sleep transitions Handling Sleep TransitionsOverview Maximizing PC energy savings requires reliable sleep transitions But, failed transitions are the primary sleep adoption blocker Component vetoes are the primary cause Roughly 1/3 of all sleep failures Drivers may veto sleep requests Services may silently fail sleep Some applications display warning