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Extra info for Analyzing Computer Systems Performance: With Perl: PDQ
12) From this deﬁnition, it is clear that the availability metric lies in the range 0 ≤ A ≤ 1. 4. 25 days and was down for 10 h. What is the average availability? 99 . 0% of the time This availability appears satisfactory, but, as we shall see shortly, there are two shortcomings in using an availability metric alone. 0% availability not being a suﬃcient measure for most production operations. The second shortcoming arises from the multiplicity of up and down times that satisfy the same availability criterion.
Experimental measurements have revealed that the setup window w for the input signal is a function of three parameters: T0 and τ , which are speciﬁc to the type of synchronizer technology being used, and the resolution time tr = tc − ts which is a function of the clock period tc and the setup time ts [Kleeman and Cantoni 1987]. The width of the window is given by: w = T0 e− tr/τ . 27) If the asynchronous input signal occurs within w, the output of the synchronizer remains metastable for a period greater than the resolution time tr .
The receipt of this message from p1 generates the second event for process p2 . Using the above rules, process p1 updates its clock from 1 to 2, prior to sending the message, then p1 sends that value along with its message. Prior to receiving the message from p1 , process p2 would have computed its local time to be 2(= 1 + 1). Instead, it calculates the max(2, 2), which in this case produces the same result. Next, according to procedure 2, p2 must now update its own local clock to be 3(= 2 + 1) and ﬁnally deliver the message.