Abstract: A method, system, and computer program for a) buffering instant messages to an intended recipient while the recipient is currently not logged on to an instant messaging system, and b) delivering buffered messages to the intended recipient after the recipient connects the instant messaging system. Thus, users are enabled to initiate instant messaging sessions with other users who are not currently online. An instant messaging device buffers messages and delivers them to the recipient when the recipient comes online. To the recipient, the method of delivery appears identical to the case where the recipient was continuously connected to the system. The main difference is the time delay, i.e. the elapsed time between the time the sender sent it and the time the recipient connected. The recipient is further able to configure the instant messaging device to be selective about which senders are allowed to buffer messages to the recipient while the recipient is disconnected.

Abstract: The energy consumption of a computing system is reduced by incorporating two or more processing units with diverse energy efficiencies and diverse processing capabilities. A scheduler intercepts an interrupt(s) from I/O space, resolves the interrupt to a task, retrieves energy and performance attributes for the task, and schedules the task for execution on the processing units such that the task will consume the least amount of energy while executing in a timely fashion.

Abstract: The energy consumption of a computing system is reduced by incorporating two or more processing units with diverse energy efficiencies and diverse processing capabilities. A scheduler intercepts an interrupt(s) from I/O space, resolves the interrupt to a task, retrieves energy and performance attributes for the task, and schedules the task for execution on the processing units such that the task will consume the least amount of energy while executing in a timely fashion.