When total memory space exists to satisfy a request (process size) but it is no contiguous, this is called: O A. Internal fragmentation O B. External fragmentation O C. Compaction O D. Paging
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- Description:The project I am working on needs to demonstrate how two processes (parent and child) can communicatethrough a shared memory region, with the child process writing a value to the shared memoryand the parent process reading that value. This is my code and I wont run. Can you help: #include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/ipc.h>#include <sys/shm.h>#include <unistd.h> #define SHM_SIZE 1024 /* shared memory size */ void error_exit(const char *msg) { perror(msg); exit(EXIT_FAILURE);} int main() { key_t key; int shmid; char *data; // Create a unique key for shared memory if ((key = ftok("shared_memory.c", 'R')) == -1) { error_exit("ftok"); } // Create the shared memory segment if ((shmid = shmget(key, SHM_SIZE, 0644 | IPC_CREAT)) == -1) { error_exit("shmget"); } // Attach the shared memory segment to our data space data = shmat(shmid, (void *)0, 0); if…Suppose a computer system uses 16-bit addresses for both its virtual and physical addresses. In addition, assume each page (and frame) has size 256 bytes. Could you hand draw the page table, if possible a) Suppose that the OS uses a two-level page table. Draw the page table. (Assume that frames 7 through 221 are free, so you can allocate space for the page table there.) In addition, suppose that the page-table directory storage comprises a whole number of consecutive full frames. (For examples: if the directory entry is 2 bytes, the entry’s storage comprises 1 frame; if the directory entry is 260 bytes, the entry’s storage comprises 2 consecutive frames.) b) What is the size of the two-level page tableAssume that you have a program that has a part at the beginning that is sequential in nature (for example, reading a file, that must be executed by only one processor) and takes 20 ms. Also there is a part at the end of the program that is sequential and takes 10 ms. Between these two parts, there is a perfectly parallelizable part and it take 480 ms in sequential. a) What is maximum speed-up according to Amdahl's law? b) What is the speed-up for 4 processors? c) What is the efficiency for 4 processors? Sorunun tüm bölümlerine cevap verin
- Suggest the situation where write() and read() are preferred over get() and put() for file I/O operations. Supportyour answer with examplesBitmap data format lets the OS track free and full partitions. How do bitmaps show allocation unit processes or holes?Answers: *process bit *hole bit *free bit *flag bitWith virtual memory, when a program requests memory,the memory management system does which of the following? Select one: A. It grants the request as long as there is enough physical memory to accommodate B. It looks up the address in the page table. If the address is in memory, then it grants the request. C. It looks up the address in the page table. If the address is in memory, it grants the request. If the address is stored to disk, it writes a section of memory to disk and then transfers the requested virtual memory address from disk to main memory. D. It causes a deadlock to occur.
- This memory allocation scheme overcomes the problems of segmentations such as compaction, external fragmentation and secondary storage handling. Select one: a. Segmented allocation b. Paged allocation c. Demand Paging d. Segmented/Demand PagedOperating systems that allow memory-mapped files always require files to be mapped at page boundaries. For example, with 4-KB pages, a file can be mapped in starting at virtual address 4096, but not starting at virtual address 5000. Why?. Q: In this problem you are to compare reading a file using a single-threaded file server and a multithreaded server. It takes 15 msec to get a request for work, dispatch it, and do the rest of the necessary processing, assuming that the data needed are in a cache in main memory. If a disk operation is needed, as is the case one-third of the time, an additional 75 msec is required, during which time the thread sleeps. How many requests/sec can the server handle if it is single threaded? If it is multithreaded?