Prototypical Design and Implementation of L4-SMP Microkernel Mechanisms
نویسندگان
چکیده
Speichergekoppelte Multiprozessorrechner finden ihren Einsatz als mittelgroße Serverrechner und HochleistungsArbeitsplatzrechner. Symmetrische MultiProzessor (SMP) Systeme bilden aus der Sicht eines Programmierers die einfachste Architektur eines speichergekoppelten Multiprocessorrechners. Die einzelnen Prozessoren eines SMPs sind über den Speicherbus (oder eine Kreuzschiene) mit einem gemeinsam nutzbaren Hauptspeicher verbunden. Dies erleichtert die Entwicklung von Anwendungen und Betriebssystemen verglichen mit NUMA Architekturen oder nachrichtengekoppelten Multiprozessoren. Gleichwohl ist die Entwicklung eines SMP-Betriebssystems, selbst für eine so einfache Architektur wie den SMP noch eine große Herausforderung. Der zusätzliche Grad an Parallelität wirft dabei Probleme auf, die mit konventionellen Lösungen nicht mehr zu lösen sind, da das Aus/ Anschalten von Unterbrechungen (interrupts) nur prozessorlokal wirksam ist.
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