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Power management device and method aiming at periodic key tasks

A periodic and task-based technology, applied in the direction of measurement devices, data processing power supplies, measurement flow/mass flow, etc., can solve problems such as incoherent audio or video, affecting user experience, etc., to ensure normal operation, save energy, and predict accurately Effect

Inactive Publication Date: 2013-01-16
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, after the playback time of an audio or video frame is missed, the user can clearly feel the incoherence of the audio or video, which will greatly affect the user experience

Method used

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  • Power management device and method aiming at periodic key tasks
  • Power management device and method aiming at periodic key tasks
  • Power management device and method aiming at periodic key tasks

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Embodiment Construction

[0015] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0016] The invention monitors the execution performance of the program by inserting the heartbeat code, reflects the execution state of the program from the perspective of the program, and adjusts the voltage and frequency of the CPU correspondingly according to the execution state of the program. The target program targeted by the present invention is a periodic critical task. Insert the heartbeat code in the outermost cycle of the program to obtain the accurate execution status of the program. Heartbeat is to simulate the heartbeat of the program by inserting code in the periodic program loop, which is used to represent the continuous execution of the program. By comparing the target performance of the program with the current execution performance, the corresponding power management scheduling strategy is determined. DVFS (Dynamic Vo...

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Abstract

The invention provides a power management device and a power management method and is mainly applied to a mobile device and an embedded device. A heartbeat generation code in a periodic target program is set and a heartbeat frequency is acquired by a heartbeat performance acquisition module of the device; the captured heartbeat frequency and the target heartbeat rate of an operation system are compared by a state analysis and decision module to decide a performance adjustment strategy; and the adjustments of frequency and voltage of a CPU (central processing unit) are finished by a system parameter adjustment module. According to the method and the device, the heartbeat frequency is acquired by the set heartbeat generation code, the frequency and the voltage of the CPU (central processing unit) are adjusted or the executing speed of the target program is reduced by comparing the heartbeat frequency and the target heartbeat rate. With the adoption of the method, the power management over the key periodic task is achieved, and the performance requirement of services can be met while the energy is dynamically saved, so that a high-quality power management service is provided.

Description

technical field [0001] The invention relates to the technical field of CPU power management, in particular to a power management device and method for periodic critical tasks. Background technique [0002] Energy efficiency is a primary consideration for a large number of computer systems. Today, the power usage time in mobile devices and the energy constraints of embedded devices at peak loads all require better management of power usage, and it is necessary to ensure the normal operation of the system under the condition of satisfying the quality of service and save energy. As the application range of embedded systems increases, it becomes more important to effectively manage the power resources of embedded systems. [0003] The existing CPU power management mechanism is to use the CPU utilization rate in the previous period, and then predict the CPU usage in the next stage, and then adjust the performance status of the CPU to save power. However, CPU usage is not linke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/26G06F1/32
Inventor 王雷李康王刚王欢赵玉龙王宇
Owner BEIHANG UNIV