Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Farhat Thabet

Yves Lhuillier

Karim Ben Chehida

Frédérique Blanc

A device and method for synchronizing tasks executed in parallel on a platform comprising comprises several computation units. The tasks are apt to be preempted by the operating system of the platform, and the device comprises at least one register and one recording module installed in the form of circuits on said platform, said recording module being suitable for storing a relationship between a condition to be satisfied regarding the value recorded by one of said registers and one or more computation tasks, the device comprising a dynamic allocation module installed in the form of circuits on the platform and configured to choose a computation unit from among computation units of the platform when said condition is fulfilled, and for launching the execution on the chosen computation unit of a software function for searching for the tasks on standby awaiting the fulfillment of the condition and notifications of said tasks.

Device and method for synchronizing tasks executed in parallel on a platform comprising several calculation units

The invention relates to a method for the on-line management of energy consumption for multiprocessor systems, the method executing at least one application according to a chart of tasks, wherein the method includes, for each application: a first phase for the off-line characterization of the variation of the potential rate of parallelism of execution of the tasks as a function of time, this characterization being based on the worst-case task execution times; and a second phase for the on-line detection and exploitation of the inactivity intervals and of the potential time excesses. A DPM technique makes it possible to determine the duration of the inactivity interval during which a processor may remain inactive according to the potential rate of parallelism characterized in the worst case.

Method for managing energy consumption for multiprocessor systems using an offline phase for characterization of a variation of a potential rate of parallelism for task scheduling and an online phase for detection and exploitation of potential inactivity intervals

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Gif sur Yvette, France

Farhat Thabet