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Soft Real-Time Scheduling in Google Earth Jeremy P. Erickson University of North Carolina at Chapel Hill
 

Summary: Soft Real-Time Scheduling in Google Earth
Jeremy P. Erickson University of North Carolina at Chapel Hill
Greg Coombe Google, Inc.
James H. Anderson University of North Carolina at Chapel Hill
Abstract
Google Earth is a virtual globe that allows users
to explore satellite imagery, terrain, 3D buildings, and
geo-spatial content. It is available on a wide variety
of desktop and mobile platforms, including Windows,
Mac OS X, Linux, iOS, and Android. To preserve the
sense of fluid motion through a 3D environment, the ap-
plication must render at 60Hz. In this paper, we dis-
cuss the scheduling constraints of this application as a
soft real-time scheduling problem where missed dead-
lines disrupt this motion. We describe a new scheduling
implementation that addresses these problems. The di-
versity of hardware and software platforms on which
Google Earth runs makes offline execution time analy-
sis infeasible, so we discuss ways to predict execution
time using online measurement. We provide experimen-

  

Source: Anderson, James - Department of Computer Science, University of North Carolina at Chapel Hill

 

Collections: Computer Technologies and Information Sciences