Title:
Coordinated CPU and Event Scheduling for Distributed Multimedia Applications
Coordinated CPU and Event Scheduling for Distributed Multimedia Applications
Author(s)
Poellabauer, Christian
Schwan, Karsten
West, Richard
Schwan, Karsten
West, Richard
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Abstract
Distributed multimedia applications require support from the underlying
operating system to achieve and maintain their desired Quality of Service
(QoS). This has led to the creation of novel task and message schedulers
and to the development of QoS mechanisms that allow applications to
explicitly interact with relevant operating system services. However, the
task scheduling techniques developed to date are not well equipped to take
advantage of such interactions. As a result, important events such
as position update messages in virtual environments may be ignored.
If a CPU scheduler ignores these events, players will experience a lack
of responsiveness or even inconsistencies in the virtual world.
This paper argues that real-time and multimedia applications can benefit
from coordinated schemes for CPU and event scheduling and we describe a
novel event delivery mechanism, termed ECalls, that supports such
coordination. We then use ECalls to reduce variations in inter-frame times
for media streams, and to reduce event response times for real-time
applications like distributed virtual worlds.
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Date Issued
2001
Extent
319985 bytes
Resource Type
Text
Resource Subtype
Technical Report