Title:
Interactors: Capturing Tradeoffs in Bandwidth Versus CPU Usage for Quality of Service Constrained Objects
Interactors: Capturing Tradeoffs in Bandwidth Versus CPU Usage for Quality of Service Constrained Objects
Author(s)
West, Richard
Schwan, Karsten
Schwan, Karsten
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Abstract
Complex distributed applications, including virtual environments, and
real-time multimedia require performance guarantees in the end-to-end
transfer of information across a network. To make such guarantees
requires the management of processing, memory, and network resources.
This paper describes the Dionisys end-system quality of service (QoS)
approach to specifying, translating, and enforcing end-to-end,
object-level QoS constraints. Dionisys differs from previous work on
QoS architectures by supporting QoS constraints on distributed shared
objects, as well as multimedia streams. Consequently, we introduce 'interactors', which capture the QoS constraints and resource
requirements at each stage in the generation, processing, and transfer
of information between multiple cooperating objects. Using
interactors, Dionisys is able to coordinate both thread and
packet-level scheduling, so that information is processed and
transmitted at matching rates. However, there are tradeoffs in the use
of CPU cycles for scheduling and the need to meet QoS constraints on
the information transferred between interacting objects. We show,
empirically, the packet scheduling frequency to minimize CPU overheads
while maximizing bandwidth usage.
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Date Issued
1998
Extent
272410 bytes
Resource Type
Text
Resource Subtype
Technical Report