2. What is context switching? Suppose there are 3 processes P0, P1, P2. At first, PO is executing then P1 interrupts. P1 will execute for some time. After that, P2 will interrupt. Then P2 will execute for some time. Then P0 will interrupt. Draw the process switching diagram.
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- you are tasked with analyzing an algorithm which schedulea processes in a multiprogramming system. You are working with a computer that has two CPUs, each CPU having two threads (hyperthreading). You are studying a scenario with three processes: P0, P1, & P2., with run times of 5, 10, & 20 msecs, respectively. All 3 programs are 100% CPU bound, don't block, and always run in the CPU it's assigned to. How long will it take for these programs to complete execution. Show three different possible outcomes (and assigned process to processor, 3 different combinations and resulting total time for all three to complete)When this option is available, the I/O queue should be prioritised above the process execution queue. In what ways may this be beneficial? Who knows what will take place if there is a disruption in the I/O. It is unclear at this time if this will have an effect on the maximum burst rate of the CPU. I'm not really clear on the point you're trying to make here.Read each description of each Process Scheduler on the left and match it with the appropriate name on the right. This scheduler decides which processes in memory get time on the CPU. It is executed very frequently. This scheduler handles "swapping" of processes from main memory to mass storage. For example, it may swap-out processes that are waiting for I/O to complete. This scheduler selects spooled processes to load from the mass storage device into mai memory. It attempts to find a good mix of "I/O bound" and "CPU Bound" processes to maximize resource utilization. [Choose ] [Choose ] ✓ [Choose ] Cool Scheduler Schedulers aren't real; Nothing is real Short-term Scheduler Medium-term Scheduler Spool Scheduler Bound Scheduler Frequency Scheduler Swap Scheduler Long-term Scheduler
- It is a computer science question based on Operating systems Need the answer and explained solution for "PART (b) ONLY": Consider a system that has two processes A and B, each wants to record a scanned document on CD. Process A requests permission to use the scanner and is granted permission. Process B is programmed differently and requests the CD recorder first & is also granted permission. Now A asked for the CD recorder but the request is denied until B releases it. Unfortunately, instead of releasing the CD recorder B asks for the scanner. Answer the following question for given above scenario; Draw the Resource Allocation Graph (RAG) & also determine that there is a deadlock that exists or not. Verify the four sufficient & necessary conditions with reasons. Which one is satisfied or not?In this scenario, we have a poorly performing PC, and we suspect it might be a process that is causing issues. In our process of troubleshooting, we want to: 1st, to view a list of all running processes to examine which ones are using the most RAM (Memory). 2nd, to view the list of all non-running processes (e.g. the status is suspended, not responding, or unknown). 3rd, to view all running processes under the user account, System. Not processes with the word, System, in the process name. Lastly (4th), to stop all processes begin with the letter S.
- A process references five pages A, B, C, D and E in the following order, A, C, B, E, A, B, E, A, B, C, D, E. Assume the replacement algorithm is first-in-first-out. Find the number of page transfers during this sequence of references starting with an empty main memory with three page frames. Repeat for four page frames.Consider a computer system with three users: Alice, Bob, and Cindy. Alice owns file X, and Bob and Cindy can read it. Bob owns file Y, and Cindy can read and write the file Y, but Alice can only read it. Cindy owns file Z, but neither Alice nor Bob can read or write it. If a user owns a file, he/she can also execute the file. Create the ACM (access control matrix) of the system Show the ACL and CL of the ACM Now Cindy allows Alice to read Z, Alice removes Bob's ability to read X, and Bob removes all the rights of Alice and Cindy to Y. Show the ACM after these changes.A deadlock occurs when a group of processes is stalled because one process is holding a resource and waiting for another process to obtain it. Consider the situation when two trains are approaching each other on the same track and there is only one track: once they are in front of each other, neither train can proceed. In operating systems, a similar scenario happens when two or more processes possess certain resources while waiting on resources owned by other processes (s). In the picture below, Process 1 is holding Resource 1 and waiting for Process 2 to acquire Resource 2, while Process 2 is waiting for Resource 1. Give an example of a realistic deadlock avoidance approach and describe the basic strategy behind it.
- Process P0 and process P1 both want to access a shared datum, X, which is currently 0. P0 wants to add 2 to it, P1 wants to add 3 to it. Answer the following.a. Without synchronization, what value(s) can X result in?b. With synchronization, what value(s) can X result in?c. If another process, P2, was supposed to access X after P0 and P1 completed their stores, where P2 sets X to 5, would your answer to a or b change?Write an ALP program for ARM Cortex M3/4 to perform the following(1) SVC is to be called from an application task running at Thread unprivileged mode.(2) Two parameters are passed to the handler via R1, R2.(3) If the SVC number is last 3 digits of your Student ID (0 to 255) or last 2 digits of your Student ID (if last 3-digits of Student ID > 255), then the addition of the data in R1, R2 should be performed and after that return and resume application task.(4) If the SVC number is not your Student ID (3 or 2 digits), then return and resume application task.Give suitable screen shots of the KEIL IDE-in debug mode to demonstrate the desired outputs. Ensure that the screenshot captures system time & day.Below Program can be used (basic skeleton)as below to perform the above conditions . AREA RESET, CODE, READONLYin DCD 0x20000100,0x8000005D, 0,0,0,0,0,0,0,0,0,SVC_handler+1,0,0,0,0,0,0,0,0,0,0,0 ENTRY MAIN LDR R1,=0X20000200 MSR PSP,R1 MOV R0,#3…(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.