New PDF release: Analyzing Computer Systems Performance: With Perl: PDQ

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By Neil J. Gunther

ISBN-10: 3540208658

ISBN-13: 9783540208655


The major motivation for this ebook stems from the remark that the folk who so much have to know the way to do functionality research are quite often thwarted by means of the volume of

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Extra info for Analyzing Computer Systems Performance: With Perl: PDQ

Sample text

In reality, computer system configurations are composed of complex networks that involve combinations of series and parallel networks. In that case assessing availability (if it can be calculated at all) requires more complicated techniques [Xie 1991] than those briefly presented here. 8 Software Reliability Because software and hardware have very different failure modes, modeling the reliability of software tends to be more difficult than it is for hardware. ” This is quantified in a measure called the mean time between defects (MTBD).

4] and Appendix D. 3 Disk Timing Chains A file I/O operation under the unix operating system can be represented as a timing chain [Vahalia 1996] with queues. It is important to understand the limitations of what the unix kernel can actually measure and what gets reported (sometimes erroneously) in certain unix I/O performance tools such as iostat. The I/O operation begins with the user program issuing a request User I/O request Device driver I/O bus Unix buffer cache Wait time Host Adaptor Disk Disk controller Service time Apparent service time (Response time) Fig.

The output of the digital synchronizer, shown in Fig. 13, simply toggles between a 1 or 0 depending on whether a 1 or 0 appears on the asynchronous input relative to the other input signal, usually a periodic system clock. The synchronized state occurs when the input signal edges rise or fall simultaneously. In more detail, this requires that the edges of the input signals arrive during the required setup and hold windows specified by the tolerances of the synchronizer. 8 Metastable Lifetimes 41 System clock Clock Asynchronous In input Synchronous system Out Fig.

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Analyzing Computer Systems Performance: With Perl: PDQ by Neil J. Gunther

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