Consider a computer with N processors in a multiprocessor configuration. a. How many processes can be in each of the Ready, Running, and Blocked states at one time? b. What is the minimum number of processes that can be in each of the Ready, Running, and Blocked states at one time?
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- On a computer system with one processor (CPU), and N (N> 1) processes present in the system, what is the maximum number of processes that can be in the Running, and in the Blocked states at any given time? Assume 5-state model for process states.What is the minimum and maximum number of processes taht can be in the ready, running and blocked states of a systen with n CPUs?NOTE: "Exekveringstid(ms)" means execution time or burst time in milliseconds Assume that a system with a CPU at one time has the following processes queued in the CPU's READY queue: Calculate the waiting time for the seven processes: 1) If FCFS is being used 2) If LRU is being used 3) If RR with time quantum of 8ms
- Suppose that each of the 4 processors in a shared memory multi-processor system is rated at 400 MIPS. A program contains a purely sequential part that accounts for 22% of the program’s execution time on a single processor. The remaining code can be partitioned into three independent parts (A, B, and C). Running on a single processor, part A accounts for 30% of the program’s execution time, part B accounts for 18%, and part C accounts for 30%. What is the apparent MIPS rating for the program if it is run on the 4-processor system and the sequential part must be completed before any of the remaining independent parts (A, B or C) can run in parallel?Imagine that you have implemented an algorithm in a program which has 40% parallelizable code. Now consider the following two cases assuming that scheduling overhead is ignored: -The program is executed on a single processor. -The program is executed on a parallel system with 4 processors. Compute the speed-up gained in the case where multiple processors are used.(a) FCFS with a single Ready Queue. A process gets scheduled once one of the CPUsis available. When both CPUs are available, we select CPU1. (b) FCFS with a Ready Queue per CPU. Processes A, B, and C go to CPU1 and processesD, E, and F go to CPU2. (c) HRRN with a single Ready Queue. A process gets scheduled once one of the CPUsis available. When both CPUs are available, we select CPU1.
- Computer Science A multiprogrammed system with a single CPU has a very large number of CPU boundprocesses running on it that all have the same priority. Could you think of a CPU schedulingalgorithm that would combine the lowest possible response times with the highest possiblethroughput and no starvationConsider the following set of processes that need to be scheduled on a single CPU. All the times are given in milliseconds.Computer A has an overall CPI of 1.3 and can be run at a clock rate of 600MHz. Computer B has a CPI of 2.5 and can be run at a clock rate of 750 MHz. We have a particular program we wish to run. When compiled for computer A, this program has exactly 100,000 instructions. How many instructions would the program need to have when compiled for Computer B, in order for the two computers to have exactly the same execution time for this program? Please explain how to solve
- 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…(1.a)A CPU-scheduling algorithm determines an order for the execution of its scheduled processes. Given n processes to be scheduled on one processor, how many different schedules are possible? Give a formula in terms of n. (b) What advantage is there in having different time-quantum sizes at different levels of a multilevel queueing system?Suppose that a multiprogrammed system has a load of N processes with individual execution times of t1, t2, ...,tN. Answer the following questions: a) How would it be possible that the time to complete the N processes could be as small as: maximum (t1, t2, ...,tN)? b) How would it be possible that the total execution time, T > t1+ t2+ ...+tN? In other words, what would cause the total execution time to exceed the sum of individual process execution times?