The following four requests could come in to an operating system as it is running on a computer system: The clock in the computer has just “ticked,” and we need to update a seconds counter. The program running on processor 2 is trying to perform an illegal operation code. Someone pulled the plug on the power supply, and the system will run out of power in 50 msec. The disk has just read the character that passed under the read/write head, and it wants to store it in memory before the next one arrives. In what order should the operating system handle these requests?

The following four requests could come in to an operating system as it is running on a computer system: The clock in the computer has just “ticked,” and we need to update a seconds counter. The program running on processor 2 is trying to perform an illegal operation code. Someone pulled the plug on the power supply, and the system will run out of power in 50 msec. The disk has just read the character that passed under the read/write head, and it wants to store it in memory before the next one arrives. In what order should the operating system handle these requests?

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

See similar textbooks

Similar questions

Let us consider a scenario in which the boot record of a disc volume is corrupted. Which file system(s) can be used to create a backup copy of the boot record?
A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through the disk-service routine, another I/O interrupt occurs.Q.) what can be done about it?
Suppose your disk volume’s boot record was corrupted. Which file system(s) would provide supportfor a backup copy of the boot record?
Suppose we have a system with 50 active processes, P0, P1, ..., P49, some user processes, and some kernel processes. For simplicity, we are not concerned with threads in this question. Ready processes are scheduled to Run by some scheduler. The scheduling algorithm does not matter here. Suppose process P13 makes a disk_read() operating system call. Assume that the completion of disk transfer is signalled by an interrupt from the disk controller. Trace as accurately as you can what happens in the CPU (not the disk) until process P13 has received its requested information from the disk. Hints: The question is about interrupt handling I am looking for a trace of what processes run, why, and what they do. I am not looking for instruction-level explanations. I am not looking for a discussion of disk access, operation, or transfer.
Suppose we have a system with 50 active processes, P0, P1, ..., P49, some user processes, and some kernel processes. For simplicity, we are not concerned with threads in this question. Ready processes are scheduled to Run by some scheduler. The scheduling algorithm does not matter here. Suppose process P13 makes a disk_read() operating system call. Assume that completion of disk transfer is signaled by an interrupt from the disk controller. Trace as accurately as you can what happens in the CPU (not the disk) until process P13 has received its requested information from the disk. Hints: The question is about interrupt handlingI am looking for a trace of what processes run, why, and what they do.I am not looking for instruction-level explanations.I am not looking for a discussion of disk access, operation, or transfer.
A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through the disk-service routine, another I/O interrupt occurs.Q.) What happens next?
Consider a disk drive specifications. with the following 16 surfaces, 512 tracks/surface, 512 sectors/ track, 1 KB/sector, rotation speed 3000 rpm. The disk is operated in cycle stealing mode whereby whenever one byte word is ready it is sent to memory; similarly, for writing, the disk interface reads a 4 byte word from the memory in each DMA cycle. Memory cycle time is 40 nsec. The maximum percentage of time that the CPU gets blocked during DMA operation?
If the value 8 is stored at the memory location indicated by address 5, what is the difference between copying the contents of that location into location 6 and simply inserting the value 5 there?
Simply said, disk prefetching is exactly what it sounds like. What are the positive and negative aspects of it?
Operating systems make an effort to save individual pieces of a file in a sequential fashion on disk. So what if we use magnetic disks for it?SSDs: necessary even if you don't use them? Is this anything that we can figure out?
Suppose that the boot record of your disc volume has been tampered with. Which of the following file systems may be used to create a backup copy of the boot record?
What is the difference between copying the value 5 into cell 6 and copying the contents of cell 5 into cell 6 if the memory cell with address 5 has the value 8?