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In a batch operating system, three jobs JOB1, JOB2, JOB3 are submitted for ex- ecution. Each job involves an I/O activity, a CPU time, and another I/O activity. JOB1 requires a total of 21 ms, with 3 ms CPU time. JOB2 requires 29 ms total time with 5 ms CPU time. JOB3 requires 14 ms total time with 4 ms CPU time. 3.1 What will be the CPU utilisation for uniprogramming? Write down all interme- (3) diate steps. 3.2 What will be the CPU utilisation for multiprogramming? Write down all inter- (2) mediate steps Task 4 . . . . . . . . . . . . . . . . . . 5.1 Explain brie y how and why the need for larger and larger operating systems (1) stimulated the rise of software engineering as a new sub-discipline of computer science. 5.2 Explain brie y what is software engineering (in contrast to mere programming). (1) 5.3 Recapitulate brie y the the most important points of problem-discussion at the (1) famous 1968 NATO Science Conference in Garmisch/Bavaria.
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