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ECET iLab 6




Thus lab needs to simulate virtual memory. It should show a fixed value of pages and faults while also being able to translate a virtual address to physical. Here is the source code I have so far;#include;#include;#include;#include;#include;#include;#include;using namespace std;#define NUM_ADDRESSES_TO_GENERATE 10000;#define IN_BUFFER_SIZE 10;#define PAGE_SIZE 2048;#define MAIN_MEMORY_SIZE 16384;#define VIRTUAL_MEMORY_SIZE 65536;#define NUM_PAGES MAIN_MEMORY_SIZE / PAGE_SIZE;// Shared buffer to write/read virtual addresses.;int inBuffer[IN_BUFFER_SIZE];// Number of virtual addresses in the shared buffer.;int inBufferCount;// Mutex used to synchronize access to the inBuffer.;pthread_mutex_t inBufferMutex;// Counter for the number of page faults.;int numberOfPageFaults;// Flag used to indicate the address generation is done.;bool addressGenerationDone;// TODO: You'll probably need some structures and variables to store information;// needed for page replacement and address translation.;int getNextVirtualAddress(int addr);// TODO: Replace below with your own method of generating virtual addresses.;// You can just generate a random address if you want, which is probably the;// easiest thing to do.;srand(time(NULL));addr = rand() % VIRTUAL_MEMORY_SIZE +1;return 0;void* doAddressGeneration(void* pArg);int addr = -1;int addressCount = NUM_ADDRESSES_TO_GENERATE;while (addressCount != 0);if (inBufferCount < IN_BUFFER_SIZE);addr = getNextVirtualAddress(addr);// Write the next virtual address. Be careful to synchronize;// appropriately with the address translation thread.;pthread_mutex_lock(&&inBufferMutex);inBuffer[inBufferCount] = addr;inBufferCount++;pthread_mutex_unlock(&&inBufferMutex);addressCount--;else;// The buffer is full. Yield to wait for it to empty.;sched_yield();// Mark that address generation is done.;addressGenerationDone = true;pthread_exit(NULL);int translateAddress(int addr);int pageNumber = VIRTUAL_MEMORY_SIZE / PAGE_SIZE;int baseVirtualAddress = pageNumber * PAGE_SIZE;int pageOffset = VIRTUAL_MEMORY_SIZE % PAGE_SIZE;int physAddr = MAIN_MEMORY_SIZE / PAGE_SIZE;int basePhysicalAddress = physAddr * PAGE_SIZE;int finalPhysicalAddress = basePhysicalAddress + 4;// TODO: See page 189 in the text for info about paging. You will need a page;// table. I found Figure 3-10 useful. This figure shows how to translate a;// virtual address to a physical address.;// TODO: If the page table does not contain a mapping for to a page frame, a;// page fault occurs. In this case, you will have to choose a page frame;// (and possibly evict an old page if all page frames are in use). I would;// recommend FIFO as the easiest to implement (see page 204). FIFO would;// require a queue of page frames.;return 0;void* doAddressTranslation(void* pArg);int addr;int physAddr;ofstream outputFile;ostream* pOutput;"ilab6_output.txt");if (outputFile.is_open());pOutput = &&outputFile;else;cout << "Error opening ilab6_output.txt, using standard output;<< endl;outputFile.close();pOutput = &&cout;cout << "Virtual: " << VIRTUAL_MEMORY_SIZE << "Physical: " << MAIN_MEMORY_SIZE << endl;<< "--------------------" << endl;// Keep translating addresses until none are left.;while (!addressGenerationDone);if (inBufferCount 0);// Read the next virtual address. Be careful to synchronize;// appropriately with the address generation thread.;pthread_mutex_lock(&&inBufferMutex);inBufferCount--;addr = inBuffer[inBufferCount];pthread_mutex_unlock(&&inBufferMutex);// Translate the virtual address.;physAddr = translateAddress(addr);*pOutput << "0x" << hex << setfill('0') << setw(4) << addr;< 0x" << hex << setfill('0') << setw(4) << physAddr;<< endl;if (outputFile.is_open());outputFile.close();pthread_exit(NULL);void* doStatistics(void* pArg);pthread_t* pAddrTranThread = (pthread_t*)pArg;// Wait until address translation thread exits.;pthread_join(*pAddrTranThread, NULL);cout << "Total Number of Page Faults = " << numberOfPageFaults << endl;pthread_exit(NULL);int main(int argc, char* argv[]);pthread_attr_t attrs;pthread_t addrGenThread;pthread_t addrTranThread;pthread_t statsThread;// TODO: Seed random number generator. If your getNextVirtualAddress;// function does not generate random numbers, the following line can be;// removed.;srand(time(NULL));pthread_mutex_init(&inBufferMutex, NULL);pthread_attr_init(&&attrs);pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_JOINABLE);// Create three joinable threads, one for each component of the iLab.;pthread_create(&addrGenThread, &attrs, doAddressGeneration, NULL);pthread_create(&addrTranThread, &attrs, doAddressTranslation, NULL);pthread_create(&statsThread, &attrs, doStatistics, &&addrTranThread);pthread_attr_destroy(&&attrs);pthread_join(addrGenThread, NULL);pthread_join(addrTranThread, NULL);pthread_mutex_destroy(&&inBufferMutex);pthread_join(statsThread, NULL);// Once all the component threads have exited, the program can exit.;return 0


Paper#63686 | Written in 18-Jul-2015

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