Lecture5 - Lecture 5 1 OT 4600 Operating Systems Fall 2009...

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Unformatted text preview: Lecture 5 1 OT 4600 Operating Systems Fall 2009 Dan C. Marinescu Office: HEC 439 B Office hours: Tu-Th 3:00-4:00 PM Lecture 5 2 Lecture 5 Lecture 5 Last time: Project. Today: Names and the basic abstractions Storage Next Time Naming in computing systems Lecture 5 3 Names and the three basic abstractions Memory stores named objects write(name, value) value READ(name) file system: /dcm/classes/Fall09/Lectures/Lecture5.ppt Interpreters manipulates named objects machine instructions ADD R1,R2 modules Variables call sort(table) Communication Links connect named objects HTTP protocol used by the Web and file systems Host: boticelli.cs.ucf.edu put /dcm/classes/Fall09/Lectures/Lecture5.ppt get /dcm/classes/Fall09/Lectures/Lecture5.ppt Lecture 5 4 Latency and Bandwidth Important concepts for physical characterization. Applies to all three abstractions. Informal Bandwidth number of operations per second! Latency to get there The bandwidth of the CPU, Memory, and I/O sbsystems must be balanced. 4 Lecture 5 5 Communication latency- time it takes the first bit sent to reach the receiver Latency Bandwidth Bandwidth- number of bits/bytes transmitted per unit of time t1 t2 t3 t4 t5 t6 Time Time Sender Receiver Program Storage device...
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This note was uploaded on 02/15/2012 for the course COP 4600 taught by Professor Montagne during the Fall '08 term at University of Central Florida.

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Lecture5 - Lecture 5 1 OT 4600 Operating Systems Fall 2009...

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