Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Global multiprocessor scheduling of aperiodic tasks using time-independent priorities
Responsible organisation
2003 (English)Conference paper, (Refereed) Published
Abstract [en]

We provide a constant time schedulability test for a multiprocessor server handling aperiodic tasks. Dhall's effect is avoided by dividing the tasks in two priority classes based on task utilization: heavy and light. We prove that if the load on the multiprocessor server stays below U-threshold = 3 - root7 = 35.425%, the server can accept incoming aperiodic tasks and guarantee that the deadlines of all accepted tasks will be met. 35.425% utilization is also a threshold for a task to be characterized as heavy. The bound U-threshold = 3 - root7 approximate to 35.425% is easy-to-use, but not sharp if we know the number of processors in the multiprocessor. For a server with m processors, we calculate a formula for the sharp bound U-threshold(m), which converges to U-threshold from above as m --> infinity. The results are based on a utilization function u(m)(x) = 2(1-x)/(2+ root2+2x)+x/m. By using this function, the performance of the multiprocessor can in some cases be improved beyond U-threshold(m) by paying the extra overhead of monitoring the individual utilization of the current tasks.

Place, publisher, year, edition, pages
TORONTO, CANADA: IEEE COMPUTER SOC , 2003.
National Category
Software Engineering
Identifiers
URN: urn:nbn:se:bth-8169ISI: 000183433500019Local ID: oai:bth.se:forskinfo339866A1AC051DEAC12575B00020F344ISBN: 0-7695-1956-3 (print)OAI: oai:DiVA.org:bth-8169DiVA: diva2:835858
Conference
9th IEEE Real-Time and Embedded Technology and Applications Symposium
Available from: 2012-09-18 Created: 2009-05-08 Last updated: 2015-06-30Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Lundberg, LarsLennerstad, Håkan
Software Engineering

Search outside of DiVA

GoogleGoogle Scholar

Total: 18 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf