onsider a system with 3 I/O devices Printer (priority of 2) Disk (priority of 4) Communication line (priority of 5) Higher priority is indicated by high numerical value. User program begins at t = 0 and the multiple interrupts occur at following time instances At t = 10, Printer interrupt occurs At t = 15, Communication interrupts occurs At t = 25 Disk interrupt occurs Show the time sequence of multiple interrupts, assuming that service routine for Printer interrupt takes 30 time units, Disk interrupt takes 10 time units, and Communication interrupt takes 5 time units.

onsider a system with 3 I/O devices Printer (priority of 2) Disk (priority of 4) Communication line (priority of 5) Higher priority is indicated by high numerical value. User program begins at t = 0 and the multiple interrupts occur at following time instances At t = 10, Printer interrupt occurs At t = 15, Communication interrupts occurs At t = 25 Disk interrupt occurs Show the time sequence of multiple interrupts, assuming that service routine for Printer interrupt takes 30 time units, Disk interrupt takes 10 time units, and Communication interrupt takes 5 time units.

Name: Consider a system with 3 I/O devicesPrinter (priority of 2)Disk (prior
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Description: Consider a system with 3 I/O devicesPrinter (priority of 2)Disk (priority of 4)Communication line (priority of 5)Higher priority is indicated by high numerical value.User program begins at t = 0 and the multiple interrupts occur at following time ins

Operations Research : Applications and Algorithms

4th Edition

ISBN:9780534380588

Author:Wayne L. Winston

Publisher:Wayne L. Winston

Chapter20: Queuing Theory

Section20.10: Exponential Queues In Series And Open Queuing Networks

Problem 11P

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3. An external event is sensed using polling with period P. It takes 100 cycles to processthe event. Processor frequency is 48 MHz. Before starting a new period, the previouspolling task should have finished. The relative deadline for processing an event is 10μs.(a) Determine the range of feasible polling periods? (b) Suppose now that an unrelated interrupt may occur and the interrupt has higher priority than the code for processing the polling event. Including all overhead, it takes 40 cycles to process the interrupt. The minimum time between two subsequent interrupts is T. Suppose that T is larger than 140 cycles. Determine the range of feasible polling periods.
Consider a system with 3 I/O devices •Printer (priority of 2) •Disk (priority of 4) •Communication line (priority of 5) User program begins at t = 0 and the multiple interrupts occur at following time instances •At t = 10, disk interrupt occurs •At t = 15, printer interrupts occurs •At t = 20 communication interrupt occurs Show the time sequence of multiple interrupts, assuming that service routine for each interrupt takes 10 time units.
Consider the below interrupts and their priority settings of user and natural interrupt priorities. a. Ext_interrupt_1: User Priority = 1, Interrupt Vector = 30; b. Ext_interrupt_2: User Priority = 0, Interrupt Vector = 45; c. Ext_interrupt_3: User Priority = 1, Interrupt Vector = 90; d. Ext_interrupt_4: User Priority = 1, Interrupt Vector = 95; If the above interrupts occur at the same time, which one will be served first? a b.
OPERATING SYSTEMS A variation of the round-robin scheduler is the regressive round-robin scheduler. This scheduler assigns each process a time quantum and a priority. The initial value of a time quantum is 50 milliseconds. However, every time a process has been allocated the CPU and uses its entire time quantum (does not block for I/O), 10 milliseconds is added to its time quantum, and its priority level is boosted. (The time quantum for a process can be increased to a maximum of 100 milliseconds.) When a process blocks before using its entire time quantum, its time quantum is reduced by 5 milliseconds, but its priority remains the same. What type of process (CPU-bound or I/O-bound) does the regressive round-robin scheduler favor? Explain.
2. There are interrupt in 8086 Mp, user, starting from interrupt number_ of them are available for the 3. IVT is a table that contain the of ISR of each interrupt. The size of the table is 4. The low bank (even bank) in 8086Mp memory has a size of bytes, starting from address: and ending with address:_
Assume that a program X is executing and then an interrupt A occurred followed by interrupt B and then C (in that order). Interrupt B has a higher priority than A and C Interrupt A has a higher priority than C. Describe in a list form what happens in this scenario.
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?
A computer employs RAM chips of 512 x 16 and ROM chips of 1024 x 8. The computer system needs 4K bytes of RAM and 2K bytes of ROM along with interface unit of 128 registers each. A memory mapped I/0 configuration is used. The two higher order bits are assigned for RAM, ROM and interface as 00, 01 and 10 respectively. a) How many RAM and ROM chips are needed
Consider the following scenario:a main program starts execution at time t = 03 second later device B sends interrupt signal5 second later device A sends interrupt signal2 second later device E sends interrupt signal3 second later device C sends interrupt signal5 second later device D sends interrupt signal5 second later device F sends interrupt signalhighlight on the following figure the paths of execution that realize the mentioned interrupt scenario.With each highlighted path indicate time value (t = ?)Finally draw one more path from the last ISR executed back to the main program and displayreturn time.
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
Assume that an interrupt mechanism uses the hardware stack to store PC and other registers of the interrupted computations. The interrupt mechanism recognizes 4 interrupt vectors IV [1], IV [2], IV [3], IV [4] initialized by addresses of their corresponding ISR I =1..4. The elements of the hardware stack are a record R, where each field stores a specific CPU register (R.PC is the field, which stores the program counter PC and so on). The Hardware stack is manipulated using the standard stack operation Pop, Push, EmptyStack.a) Explain how the CPU detects an interrupt signal I and what actions should be taken?b) Write the initial and final sequences of instruction of a given ISR I (Transparency).c) Write the ISR4 such that whatever number of interrupted computation (in the stack) it gives the control to the first one interrupted.
In a main memory-disk virtual storage system, the page size is 1KByte and the OPTIMAL algorithm is used for page replacements. A given program has been allocated three page frames in the main memory and it makes the following 16 memory references when it starts executing (the addresses are given in decimal):500, 2000, 2500, 800, 4000, 1000, 5500, 1500, 2800, 400, 5000, 700, 2100, 3500, 900, 2400 Fill in the contents of the three page frames after each memory reference in a table and calculate the hit ratio. Hint: denote by 'a' the page consisting of locations 0 through 1023 in memory. Similarly, b: 1024-2047, c: 2048-3071, d: 3072-4095, e: 4096-5119 and f: 5120-6143. Round to three decimal places.