In a multiprogrammed environment with 32MB of RAM where all processes require 9MB of unshared RAM and spend 40% of their time in I/O wait, calculate the maximum achievable CPU utilization. If the RAM available is increased by 700% and time spent in I/O wait increases by 100%, calculate how much RAM will remain unused when CPU utilization is just above 99%.
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In a multiprogrammed environment with 32MB of RAM where all processes require
9MB of unshared RAM and spend 40% of their time in I/O wait, calculate the
maximum achievable CPU utilization. If the RAM available is increased by 700%
and time spent in I/O wait increases by 100%, calculate how much RAM will remain
unused when CPU utilization is just above 99%.
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Solved in 2 steps
- Processor R is a 64-bit RISC processor with a 2 GHz clock rate. The average instruction requires one cycle to complete, assuming zero wait state memory accesses. Processor C is a CISC processor with a 1.8 GHz clock rate. The average simple instruction requires one cycle to complete, assuming zero wait state memory accesses. The average complex instruction requires two cycles to complete, assuming zero wait state memory accesses. Processor R can’t directly implement the complex processing instructions of Processor C. Executing an equivalent set of simple instructions requires an average of three cycles to complete, assuming zero wait state memory accesses. Program S contains nothing but simple instructions. Program C executes 70% simple instructions and 30% complex instructions. Which processor will execute program S more quickly? Which processor will execute program C more quickly? At what percentage of complex instructions will the performance of the two processors be equal?Find the ratio of CPU utilization for a system spend 120 minutes to execute the processes and the total latency (Context switch time) time is 20 minutes.In a batch operating system, three jobs are submitted for execution. each job involves and I/O activity, CPU time and another I/O activity of the same time span as the first. Job JOB1 requires a total 23ms, with 3ms CPU time;JOB2 requires requires a total time of 29 ms with 5ms CPU time; JOB3 requires a total time of 14 ms with 4ms CPU time. Illustrate their execution and find CPU utilization for uniprogramming and multiprogramming systems. Also,Graphical representations and numeric calculations are expected to be showned.
- A multiprocessor with 10 processors has 36 attached tape drives. A number of jobs have been submitted to the system where each job requires a maximum of 6 drives in order to complete execution. Assume that each job starts running with only 4 drives for a long period before requiring the other 2 drives for a short period toward the end of its operation. Also assume an endless supply of those jobs. Assume the scheduler in the operating system will not start a job unless there are 6 tape drives available. When a job is started, 6 drives are assigned immediately and are not released until the job finishes. 5.1 What is the maximum number of jobs that can be in progress at once? 5.2 What is the maximum number of tape drives that may be left idle as a result of this policy? 5.3 What is the minimum number of tape drives that may be left idle as a result of this policy?In a timesharing OS we have the following cpu timeline for two tasks X and Y. The timeslice is 1s.Both tasks are available in the system at the same time t=9:00:00.000 and order of arrival is the obviousX followed by Y. (The decimals reflect milliseconds if they showup in an indicated time reference.) There are no other processes (tasks) in the system other than X,Y. 1234567890 XYXYX--YXY The time line 1 indicates that at t=9:00:00s task X starts its execution and when t=9:00:01s is reached task Y takes over. The time line 1 indicates the 'first second' and time line 0 indicates the 'tenth second' above.Task Y completes its execution at t=9:00:10s, the completion of the tenth second since X started its execution. Task X has completed its execution earlier. (a) What is the total number of context switches starting from prior to t=9:00:00s (e.g. t=8:59:59.999) through thecompletion of $Y$? answer is 16s (b) What is the turnaround time for Y? answer is 10s (c) What is…Suppose a program (or a program task) takes 1 billion instructions to execute ona processor running at 2 GHz. Suppose also that 50% of the instructions executein 3 clock cycles, 30% execute in 4 clock cycles, and 20% execute in 5 clockcycles. What is the CPI and CPU time for the program?
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