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CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2011/
Module Title: Computer Systems Design
Module Code: ELTR
School: Electrical & Electronic Engineering
Programme Title: Bachelor of Engineering (Hons) in Electronic Systems Engineering
Programme Code: EELES_8_Y
External Examiner(s): Dr A. Donnellan, Mr I. Kennedy Internal Examiner(s): Mr Fergus O’Reilly
Instructions: Answer 3 questions, all questions carry equal marks.
Duration: 2 hours
Sitting: Winter 2011/
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination. If in doubt please contact an Invigilator.
Q1 (a) List three fundamental principles of a Von Neumann machine architecture. Explain the benefits they bring and how/where these have appeared in the modern computer/programming model. [ 10 marks ]
(b) Explain how pipelining can create difficulties in memory access in a Von Neumann machine and how this can be tackled effectively. How is this solution implemented in modern micro-processors, (give examples). [ 10 marks ]
(c) Describe briefly two(2) of the following, using diagrams where appropriate.
Control and Data Hazards and their solutions Superscalar Execution, benefits and assisting techniques. On-Chip cache memories. [14 marks]
[ Total: 34 marks]
Q2 (a) Describe using diagrams how a paged based memory management system can translate a virtual space of 2048MB (31 bit) into a physical space of 128 MB ( bits). Take into account that the average active code/data block is 64 KB in size for this system. [14 marks]
(b) Using diagrams describe how a high-end server type machine, with 2- commodity 32 bit processors (32 bit registers but 36 bit addresses for memory) (e.g. Sun UltraSparc or Pentium Xeon vairants), would typically be organised, for good flexibility and performance. It will have 64-128 GB RAM. State and justify the memory models used and what name might commonly be given to this type of machine or organisation. [10 marks]
(c) A paging based virtual memory system has the following utilisations. CPU Utilisation 20% Paging Disk 95% Other I/O 5%
Explain what is happening and what causes it. What steps if any do you think could be taken to improve CPU utilisation? [10 marks]
[ Total: 34 marks]
