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Instruction Eclipse Memory Problems in Current Systems

Filip Sebek

Computer Architecture Research laboratory Department of Computer Research and Architectural Technology licentiate thesis 2002-10 ISBN 97-88834-38-7 (13th Sept. 2010 2002)

Instruction Cache Memory Issues in Real-Time Systems

Filip Sebek

Department of Computer Scientific research and Anatomist Mälardalen University or college Västerås, Sweden

Abstract

Cache memories may contribute to significant performance positive aspects due to the gap between CENTRAL PROCESSING UNIT and memory space speed. They have traditionally recently been thought of as contributors to unpredictability because the consumer can not be certain of exactly how much period will go while a memory-operation is conducted. In a real-time system, cache memory memory may well contribute to a missed deadline by basically making the system slower, but this is rare. To avoid this problem, the builders of current systems have work the program inside the old-fashioned method; with impaired cache — just to end up being safe. Turning the cache off, however , will also make additional features like instruction pipelining less beneficial so the new processors will not give the performance speedup as they were supposed to give. The first ways to determine the boundaries in the execution time in computer systems with cache recollections were shown in the late eighties — 20 years after the first cache remembrances were designed. Today, fifteen years after, further methods have been produced to determine the setup time with cache remembrances... that were state of the art fifteen in years past. This thesis presents a method of generating worst-case execution period scenarios and measure the performance time during those. A lot of important properties can be tested. These include cache-related pre-emption delay, missratio degrees of software, and instruction disparition miss-ratio tolerance levels for increased program performance. Aside from the dynamic measurement method, a statical treatment to determine the maximum instruction refuge miss-ratio level is shown. Experimental results from this exploration show that the indirect disparition cost of a pre-emption is incredibly high — more than 3 times the setup cost of the context-switch features themselves. One other result shows that the examined computer system devoid of caching is not going to cause a skipped deadline in the event the instruction refuge is allowed. i

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Copyright c Filip Sebek, 2002 ISBN 97-88834-38-7 Printed by simply Arkitektkopia, Västerås, Sweden Syndication: Mälardalen University or college Press A This doc was created in Emacs 20. 3. 1, typesetted in LTEX, spell and grammar examined in Ms Word 2150 and compiled with MikTeX 2 . installment payments on your Figures were created simply by gpic from your GNU organization and department of transportation from AT& T labs.

To Hermosa, Zacharina, and Xerxes

Preamble

It all began that working day in 81 when my father came home with the publication " Basic Basic” simply by Dag Toijer which he had borrowed in the library. We read the book several times and started to write programs — with a conventional paper and pen since a pc was way too expensive to own. Four years later I bought my first computer — a Commodore 64. Let me never forget that day in Hanover, going for walks proudly with the box made up of my very own pc. Many books and pcs later, more than a decade ago, I had a chance to become a Ph level. D. college student while functioning as a instructor at Mälardalen University. The Department of Computer Architectural performed study in current systems, as my key interest was at computer architecture, I found this combination of issues to be organic but also very exciting. It is a challenge to struggle with unreadable papers, bugs in my very own software, and glitching equipment not to mention all the other duties I possess as a teacher and being a part of my family. Several times I have been near giving it most up, currently I'm finally there. The task presented from this thesis may possibly have been difficult if I hadn't had this sort of encouraging and stimulating people around myself. My administrators Lennart Lindh, Björn Lisper, Hans...

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