Suppose an application is assigned 4 pages of physical memory and the memory is initially empty. It then references pages in the following sequence: ABCDCAEFCFAGECA Show how the system would fault pages into the four frames of physical memory when each of the following replacement policies is used (clearly state the number of page faults for each policy, and justify this number by a diagram similar to the one discussed in lectures). 1- FIFO 2- LRU 3- MIN (optimal)
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- Producer-Consumer Problem Variation. In class, we reviewed the Producer-Consumer problem, which used semaphores to control access to a bounded buffer where a Producer process would produce data items and add them to the buffer and one Consumer would remove data items from the buffer and consume them (please refer to slide 18 in the Week 9 PowerPoint or Figure 5.16 in the course textbook for the pseudocode for this problem). As a variation of that problem, assume the bounded buffer size is 12. Assume the Producer process enters 3 items at a time into the buffer. It will only do this if there are at least 3 empty spots in the buffer. Assume the Consumer process will remove items 2 at a time, and will only do so if there are at least 2 items in the buffer. In addition to the Producer and Consumer processes, assume there is a third Hybrid process. Each time it accesses the buffer its role changes. One time it is a Producer entering a single item, and the next time it is a Consumer removing…Interrupts are system wide events that stop the execution of a currently running process. Examples of interrupts include (but are not limited to) mouse clicks, process termination, key presses, etc. Some interrupts are considered as more important to be handled first then the others. For example, a hardware interrupt such as hard drive read operation has lesser priority than a memory read. In this way, the most appropriate data structure for representing of such events is the priority queue. Demonstrate by writing an algorithm or a flowchart how to insert the following interrupts in a heap so the highest priority element should move out first. Interrupts Priorities INT 0 100 INT 10 51 INT 11 52 INT 21 54In this project you are to design a process queue that is responsible for handling the process requests coming from different users. You have to take into consideration that users have different levels of privileges and priorities. Each user has an identification number and a password, in addition to process priorities. One good idea is to design the queue using an array or pointers while preserving the first-in first-out concept of the queue. For every process request received, the program should check the privileges of that request and whether it can be moved forward in the queue to be served by the operating system prior to serving the other requests. Using the programming language of your choice (preferably C+), write the process queue that would handle the user request. The program must allow for requests coming from different users or from one user.
- Write a C program to simulate producer-consumer problem using semaphores. TASK: DESCRIPTION Producer-consumer problem, is a common paradigm for cooperating processes. A producer process produces information that is consumed by a consumer process. One solution to the producer-consumer problem uses shared memory. To allow producer and consumer processes to run concurrently, there must be available a buffer of items that can be filled by the producer and emptied by the consumer. This buffer will reside in a region of memory that is shared by the producer and consumer processes. A producer can produce one item while the consumer is consuming another item. The producer and consumer must be synchronized, so that the consumer does not try to consume an item that has not yet been produced.Multi-tasking can not be achieved with a single processor machine. True False 2. Async/Await is best for network bound operations while multi-threading and parallel programming is best for CPU-bound operations. True False 3. The following is a characteristic of an async method:The name of an async method, by convention, ends with an "Async" suffix. True False 4. Using asynchronous code for network bound operations can speed up the time needed to contact the server and get the data back. True False 5. Asynchronous programming has been there for a long time but has tremendously been improved by the simplified approach of async programming in C# 5 through the introduction of: The Task class True FalseIn this assignment, you will implement a simple OS scheduler using C/C++. The scheduler's task is to receive a set of processes and their details, and then decide the order of executing these processes based on the chosen algorithm. Finally, the scheduler will output the order of process execution, in addition to some stats about each of the processes. The scheduling algorithm chosen for this assignment will be SJF (Shortest Job First). The input will start with an integer N, representing the number of processes, followed by N lines (one for each process). For each line i, the line will start with a strings, representing the process name, followed by 2 numbers representing the arrival time and processing time for the ith process, respectively. Your program should print a line indicating the order of executing the processes. Then, for each process, the program should print a line showing the process's name, response time, turnaround time, and delay. See the sample output below for…
- Race condition is the scenario that the same problem can finish at different time when running at processors with different speeds or rates. O True O False When the total utilization of a given periodic task set is lower than 0.5, all tasks can meet their deadlines. O True O False There are in general two methods for interprocess communication: shared variable and The cyclic scheduling scheme is much simpler, more flexible, and adaptive than the round-robin scheduling scheme. O True O False Real time systems can be largely classified as soft real time systems and firm real time systems. O True he O False3. Write a WEB application consisting of an HTML file (for transferring parameters) and a PHP script through which: - to add ‘simultaneously’ two new articles in a table (the HTML file will contain enough boxes, so that a screen allows the entry of data for two articles / lines simultaneously). - Also, after the addition, to display on the screen (tabbed) all the information from the database table. Obvious, - the addition operation will be parameterizedCreate a game using the LPC1768 and MBED Application Board running MBED OS 5 or 6. The game must use at least two periodic (time-driven) tasks and one event-driven task, its complexity should be manageable by the given hardware. All tasks must have a visible output. At least two of the tasks must share an output which they could (in theory) access simultaneously so that mutual exclusion must be used to avoid a race condition in your code. The game should include some form of timing
- Assume a primitive time-sharing operating system is running on a computer with 50,000 32-bit words of main memory, with the resident monitor consuming 10,000 of that. When control is to be assigned to an interactive user, the user’s program and data were loaded into the remaining 40,000 words of main memory. A program is always loaded to start at the location of the 10,000th word; this simplified both the monitor and memory management. Assume that there are four interactive users with the following memory requirements, in words: Job1: 10,000, Job2: 30,000, Job3: 1000, Job4: 5,000 Draw the main memory state diagram considering the following: (a) The monitor loads Job1 and transfers control to it. (b) The monitor decides to load Job2 and transfer control to it. (c) Next, the monitor decides to load Job3 and transfer control to it. (d) Next, the monitor decides to load Job1 and transfer control to it. (e) Next, the monitor decides to load Job4 and transfer control…Assume a primitive time-sharing operating system is running on a computer with 50,000 32-bit words of main memory, with the resident monitor consuming 10,000 of that. When control is to be assigned to an interactive user, the user’s program and data were loaded into the remaining 40,000 words of main memory. A program is always loaded to start at the location of the 10,000th word; this simplified both the monitor and memory management. Assume that there are four interactive users with the following memory requirements, in words: Job1: 10,000, Job2: 30,000, Job3: 1000, Job4: 5,000 Draw the main memory state diagram considering the following: (a) The monitor loads Job1 and transfers control to it. (b) The monitor decides to load Job2 and transfer control to it. (c) Next, the monitor decides to load Job3 and transfer control to it. (d) Next, the monitor decides to load Job1 and transfer control to it. (e) Next, the monitor decides to load Job4 and transfer control to it.…Assume a primitive time-sharing operating system is running on a computer with 50,000 32-bit words of main memory, with the resident monitor consuming 10,000 of that. When control is to be assigned to an interactive user, the user’s program and data were loaded into the remaining 40,000 words of main memory. A program is always loaded to start at the location of the 10,000th word; this simplified both the monitor and memory management. Assume that there are four interactive users with the following memory requirements, in words: Job1: 10,000, Job2: 30,000, Job3: 1000, Job4: 5,000 Draw the main memory state diagram considering the following: (a) The monitor loads Job1 and transfers control to it. (b) The monitor decides to load Job2 and transfer control to it. (c) Next, the monitor decides to load Job3 and transfer control to it. (d) Next, the monitor decides to load Job1 and transfer control to it. (e) Next, the monitor decides to load Job4 and transfer control to it.…