A multicore processor with 4 cores has 15 attached tape drives. There is a large number of jobs submitted to the system that each requires exactly 4 tape drives to complete execution. Assume that each job runs on 4 tapes for the entire duration of its execution. Also assume an endless supply of such jobs. The scheduler in the operating system will not start a job unless there are 4 tape drives available. When a job is started, 4 drives are utilized immediately for its execution and are not released until the job finishes. a) What is the maximum number of jobs that can be in progress at once? b) What are the maximum and minimum number of tape drives that may be left idle at a given time as a result of this policy?

A multicore processor with 4 cores has 15 attached tape drives. There is a large number of jobs submitted to the system that each requires exactly 4 tape drives to complete execution. Assume that each job runs on 4 tapes for the entire duration of its execution. Also assume an endless supply of such jobs. The scheduler in the operating system will not start a job unless there are 4 tape drives available. When a job is started, 4 drives are utilized immediately for its execution and are not released until the job finishes. a) What is the maximum number of jobs that can be in progress at once? b) What are the maximum and minimum number of tape drives that may be left idle at a given time as a result of this policy?

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

See similar textbooks

Similar questions

Consider a CPU which operates with 20Mbyte/s operating speed. The CPU is operating on program control mode of I/O and it has to transfer data of 20 bytes from it. The data is transferred byte wise. Size of the Status register is 2 bytes. What is the total time needed to perform the data transfer?
What is the maximum number of processes that can be in Ready state for a computer system with 2 CPUs?
Overlapping I/O with computation. The driver inputs a sequence of data items, each of which must be processed before the next item is copied.(The status check has been omitted in the pseudo code for clarity): repeat write parameters for input operation write opcode repeat read busy until FALSE copy data item from input buffer process data item The device does not have to be idle during the processing phase. Modify the code such that the processing is overlapped with the I/O device operation.
Assume that a personal computer must get two pieces of data from its memory for every operation (one piece of data indicates which instruction to perform; the other is the information which is operated on). If the computer is the size of a typical PC, how long does it take to get these pieces of data? From this, what is the maximum rate at which the PC can execute instructions? Assume half the speed of light as travel rate.