Consider a program that accesses a single I/O device and compare un-buffered I/O to the use of a buffer. Show that the use of the buffer can reduce the running time by at most a factor of two.
Answer to relevant Questionsa. Perform the same type of analysis as that of Table for the following sequence of disk track requests: 27, 129, 110, 186, 147, 41, 10, 64, 120. Assume that the disk head is initially positioned over track 100 and is moving ...Consider the disk system described in Problem 11.7, and assume that the disk rotates at 360 rpm. A processor reads one sector from the disk using interrupt-driven I/O, with one interrupt per byte. If it takes 2.5 μs to ...List and briefly define three blocking methods. Consider a hierarchical file system in which free disk space is kept in a free space list. a. Suppose the pointer to free space is lost. Can the system reconstruct the free space list? b. Suggest a scheme to ensure that the ...a. The TinyOS Resource interface does not allow a component that already has a request in the queue for a resource to make a second request. Suggest a reason. b. However, the TinyOS Resource interface allows a component ...
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