Proceedings of the 2014 conference ICT for Sustainability

Cryogenic: Enabling Power-Aware Applications on Linux

Alejandra Morales Ruiz, Wilfried Daniels, Danny Hughes, Christian Grothoff
Corresponding Author
Alejandra Morales Ruiz
Available Online August 2014.
DOI to use a DOI?
Task scheduling, energy efficiency, POSIX.
Modern hardware devices that are idle for a certain period of time enter into sleep mode as a means of reducing power consumption. Naturally, devices should remain in sleep mode for as long as possible to maximize energy savings. However, a growing number of applications perform non-urgent background tasks, which may force hardware to wake up. It would be better if such non-urgent activities could be scheduled to execute only when the respective devices are already in use, as this would maximize the duration of sleep-states. This requires cooperation between applications and the kernel, as only the kernel can coordinate between applications that access the same hardware, and only applications know which tasks can be deferred and for how long. This paper presents the design and implementation of Cryogenic, a POSIX-compatible API that enables the clustering of tasks that access the same hardware. Specifically, the Cryogenic API allows applications to defer tasks until devices are used by other processes. This way, non-urgent tasks can choose not to wake up the device they require and instead defer their execution until either other tasks force the device to be powered on, or until the task becomes urgent. Cryogenic has been realized as a new Linux module, which integrates with the existing POSIX event loop system calls. This allows the use of Cryogenic on many different platforms, as long as the platform uses a Linux-kernel at the heart of the operating system. In addition to describing the design and implementation of Cryogenic, this paper contains experimental results that demonstrate Cryogenic’s ability to reduce power consumption using physical measurements on a Raspberry Pi.
Open Access
This is an open access article distributed under the CC BY-NC license.

Download article (PDF)

ICT for Sustainability 2014 (ICT4S-14)
Part of series
Advances in Computer Science Research
Publication Date
August 2014
DOI to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

AU  - Alejandra Morales Ruiz
AU  - Wilfried Daniels
AU  - Danny Hughes
AU  - Christian Grothoff
PY  - 2014/08
DA  - 2014/08
TI  - Cryogenic: Enabling Power-Aware Applications on Linux
BT  - ICT for Sustainability 2014 (ICT4S-14)
PB  - Atlantis Press
SP  - 189
EP  - 198
SN  - 2352-538X
UR  -
DO  -
ID  - MoralesRuiz2014/08
ER  -