Suppose the user process' size is 8192Kb and is a standard hard disk where swapping has a data transfer rate of 1Mbps. Calculate for the total swap time in milliseconds (swap-in time and swap-out time) of the 8192Kb process to and from the physical memory.
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Suppose the user process' size is 8192Kb and is a standard hard disk where swapping has a data transfer rate of 1Mbps. Calculate for the total swap time in milliseconds (swap-in time and swap-out time) of the 8192Kb process to and from the physical memory.
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- Suppose that a magnetic disk has an average seek time of 4 ms, a rotation rate of 5400 RPM, a transfer rate of 50 MB/second, a sector size of 512 bytes, and controller overhead of 2 ms. What is the average amount of time to read a single sector?Assume that 1000MB of data needs to be transferred to the hard disk at the rate of 200 MB /sec. Considering a swapout time of 2000ms, what would be the total context switch component time.Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stored in a bit serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk.?
- Consider a disk pack with 32 surfaces, 64 tracks and 512 sectors per pack. 256 bytes of data are stored in a bit serial manner in a sector. The number of bits required to specify a particular sector in the disk is.Suppose that a disk drive rotates at 8000 RPM. It has an average seek time of 4 milliseconds. If its transfer rate is 15 Mbps, determine the average time it takes for a 15K byte request to be transferred from the time the disk starts the seek? From this, determine its throughput.Consider a demand-paged computer system where the degree of multiprogramming is currently fixed at seven. The system was recently measured to determine utilization of the CPU and the paging disk. Three alternative results are shown below. For each case, what is happening? Can the degree of multiprogramming be increased to increase the CPU utilization? Is the paging helping? Justify.a. CPU utilization 10 percent; disk utilization 95 percentb. CPU utilization 95 percent; disk utilization 1 percentc. CPU utilization 10 percent; disk utilization 5 percen
- A computer has a cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache, 20 ns are required to access it. If it is in main memory but not in the cache, 60 ns are needed to load it into the cache, then the reference is started again. If the word is not in main memory, 12 ms (not ns) are required to fetch the word from disk, then the reference is started again. The cache hit ratio is 0.9 and the main memory hit ratio is 0.06. What is the average time in ns required to access a referenced word on this system?Consider a disk drive specifications. with the following 16 surfaces, 512 tracks/surface, 512 sectors/ track, 1 KB/sector, rotation speed 3000 rpm. The disk is operated in cycle stealing mode whereby whenever one byte word is ready it is sent to memory; similarly, for writing, the disk interface reads a 4 byte word from the memory in each DMA cycle. Memory cycle time is 40 nsec. The maximum percentage of time that the CPU gets blocked during DMA operation?Suppose we have a computer with the following characteristics: the magnetic disk has an accesslatency of 15 milliseconds and a streaming transfer rate of 5 megabytes per second. For the disk described,what is the effective transfer rate if an average access is followed by a streaming transfer ofa. 1024 bytes
- It is given that on a system, on average, an instruction executes in 1 nano second. Suppose that it takes 20 micro seconds of processor time for page fault. While, it takes 300 micro seconds of disk time for reading and writing a single page. Suppose that on average 1/3 of the pages that need to be paged out are modified. What is the average number of instructions between page faults that would cause the disk to be busy doing page transfers all the time?b). Consider a system with 32 bits per disk address that has a totalof 1000,000 blocks, and 400,000 free blocks. How many bits would be needed tostore the free-space list using each of the following methods.(i). Bit map.(ii). Link list.Consider a single-platter disk with the following parameters: rotation speed: 7200 rpm; number of tracks on one side of platter: 30,000; number of sectors per track: 600; seek time: one ms for every hundred tracks traversed. Let the disk receive a request to access a random sector on a random track and assume the disk head starts at track 0. a. What is the average seek time? b. What is the rotational latency? c. What is the transfer time for a sector? d. What is the total average time to satisfy a request?