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Presentation/PPT
27/08/2022
The objective of this week’s lab is to simulate and evaluate different memory allocation/deallocation techniques (first fit, next fit, best fit, and worst fit)when a linked list is used to keep track of memory usage. You will implement a separate Memory component for TWO of the four memory allocation/deallocation techniques. This lab is designed to be completed in two weeks. One allocation/deallocation technique is due on Week 4, and the second technique is due on Week 5.
Assume that the memory is 256 KB and is divided into units of 2 KB each. A process may request between 3 and 10 units of memory. Your simulation consists of three components: a Memory component that implements a specific allocation/deallocation technique, a request generation component that generates allocation/deallocation requests, and a statistics reporting component that prints out the relevant statistics. The Memory component exports the following functions:
The request generation component generates allocation and deallocation requests. For allocation requests, the component specifies the process ID of the process for which memory is requested as well as the number of memory units being requested. For this simulation, assume that memory is requested for each process only once. For deallocation requests, the component specifies the process ID of the process whose memory has to be deallocated. For this simulation, assume that the entire memory allocated to a process is deallocated on a deallocation request. You may generate these requests based on some specific criteria, e.g., at random or from a memory allocation/deallocation trace obtained from some source.
There are three performance parameters that your simulation should calculate for the chosen two techniques: average number of external fragments, average allocation time in terms of the average number of nodes traversed in allocation, and the percentage of times an allocation request is denied.
Generate 10,000 requests using the request generation component, and for each request, invoke the appropriate function of the Memory component for each of the memory allocation/deallocation techniques. After every request, update the three performance parameters for each of the techniques. The statistics reporting component prints the value of the three parameters for the two techniques at the end.
You will submit four separate files to the dropbox for Week 4:
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