Explain what phantom arms are and why they happen. Why is it possible that this could lead to bad concurrent processing even though the two-phase synchronisation method is being used?

What does the intractable nature of the halting issue imply?

Write (in pseudocode) an implementation of virtual clocks, including the queuing and management of timer requests for the kernel and applications. Assume that the hardware provides three timer channels.

The issue is which type of program-level parallelism, control or data, works best with SIMD. What kind of parallelism is most appropriate for MIMD at the program level?

Please and thank you. 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.

A MISD machine is an example of a systolic array, a kind of array. Data processing units are organized into a "wavefront" in a systolic array. All of these components do not need the use of a program counter since execution is initiated when new data is received. Lock-step computation is achieved in a clocked-systolic array, where each unit completes its alternating calculation and communication phases in the same clock cycle.

Write (in pseudocode) an implementation of virtual clocks, including the queuing and management of timer requests for the kernel and applications. Assume that the hardware provides three timer channels.

When a central processing unit (CPU) produces an interrupt, the processor is compelled to stop whatever it is working on in order to react to the signal that has been received. It has piqued my interest to learn more about the reasoning for pausing the procedure in order to finish the assignment. Let's begin by going through the steps involved in the process of interrupting, and then we'll move on to the steps involved in the process of executing. Explain?

The concepts of interrupt latency and context switching time are broken down into its constituent elements during the course of this article.

Consider a demand-paging system with a paging disk that has an average access/transfer time of 50 ms. Addresses are translated through a page table in main memory, with an access time of 500 ns per memory access. Thus, each memory reference through the page table takes two accesses. To improve this time, we have added a TLB that reduces access time to one memory reference if the page-table entry is in the TLB. Assume that 80% of the accesses are in the TLB and that, of those remaining, 15% (or 3% of the total) cause page faults. We assume that the TLB access time is 20 ns. What is the effective access time?