Middleware 2003

ACM/IFIP/USENIX International Middleware Conference

Rio Othon Palace Hotel

Rio de Janeiro, Brazil

16-20 June 2003

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Full Paper Abstracts

Flexible and Adaptive QoS Control for Distributed Real-time and Embedded Middleware

Richard Schantz, Joseph Loyall, Craig Rodrigues, Doug Schmidt, Y. Krishnamurthy and
Irfan Pyarali (BBN, Vanderbilt U. and OOM Works)

Computing systems are increasingly distributed, real-time, and embedded, and must operate
under highly unpredictable and change-able conditions. To provide predictable mission-critical
quality of service (QoS) end-to-end, QoS-enabled middleware services and mechanisms have
begun to emerge. However, the current generation of commercial-off-the-shelf middleware lacks
adequate support for ap-plications with stringent QoS requirements in changing, dynamic
environments. This paper provides two contributions to the study of adaptive middleware to control
distributed real-time and embedded (DRE) applications. It first describes how priority- and
reservation-based OS and network QoS management mechanisms can be coupled with
standards-based, off-the-shelf distributed object computing (DOC) middleware to better support
dynamic DRE applications with stringent end-to-end real-time requirements. It then presents the
results of experimentation and validation activities we are conducting to evaluate these combined
OS, network, and middleware capabilities. Our work integrates currently missing low-level resource
control capabilities for end-to-end flows with existing capabilities in adaptive DRE middleware, and
sets the stage for further advances in fine-grained precision man-agement of aggregate flows using
dynamic ad-aptation techniques.

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