By Neil J. Gunther
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Extra info for Analyzing Computer Systems Performance: With Perl: PDQ
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.
Analyzing Computer Systems Performance: With Perl: PDQ by Neil J. Gunther