Event-Driven Energy Accounting for Dynamic Thermal Management
Frank Bellosa, Simon Kellner, Martin Waitz, Andreas Weissel,
"Event-Driven Energy Accounting for Dynamic Thermal Management",
Proceedings of the Workshop on Compilers and Operating Systems for Low Power
(COLP'03), New Orleans, Louisiana, USA, September 2003
[Abstract(english)]
[Full Paper (pdf), 596 kB]
[Talk (pdf)]
Abstract:
With increasing clock speed and level of integration in today's processors,
memories, and I/O-controllers, power dissipation is becoming a definitive
concern of system design. Control-theoretic techniques have proven to
manage the heat dissipation and temperature starting from the level of
functional blocks within the processor up to the level of complete systems,
so that a thermal emergency will never be reached. However application-,
user- or service-specific requirements had to be neglected.
In this work we investigate dynamic thermal management with respect to the
demands of individual applications, users or services. We present an
event-driven approach to determine on-the-fly the energy consumption on a
fine grained level and describe a model to estimate the temperature without
the need for measurement. With this power and thermal model-combined with
the well-known facility of resource containers-it is possible to throttle
the execution of individual tasks according to their energy-specific
characteristics and the thermal requirements of the system. In addition to
throttling we investigate a modified process scheduler which allots CPU
time according to the power contribution of each task to the current
temperature level of the processor.
Experiments using a Pentium 4 architecture running a modified Linux show
that a given temperature limit for the CPU will not be exceeded while tasks
are scheduled according to their energy consumption.