A CPU with interrupt-driven 1/O is busy servicing a disk request. While the CPU is midway through the disk- service routine, another I/O interrupt occurs. a) What happens next? . b) Is it a problem?! c) If not, why not? If so, what can be done about it?
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- A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through the disk-service routine, another I/O interrupt occurs.Q.) what can be done about it?A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through the disk-service routine, another I/O interrupt occurs.Q.) What happens next?Please let me know if these are true or false! In multiprocessors with a shared physical main memory, an access to a word of main memory always takes about the same amount of time no matter which word is being accessed and by which processor: T/F? When reading data from a magnetic disk, the rotational latency increases linearly with the size of the request: T/F? SSD is faster to access than magnetic disk, but slower than DRAM main memory: T/F? The primary purpose of RAID is for data backups: T/F? Typically, data parallelism offers greater opportunities for achieving highly-parallel execution than does functional parallelism: T/F? In MIPS systems, one way to implement locks is with the MIPS test-and-set machine language instruction: T/F?
- Answer the following short questions to the point. Which bit in the PTE does the operating system use for approximating LRU replacement? Does a TLB miss always/sometimes/never result in a paging from disk? What are the two components of a virtual address used in segmented virtual memory? In what Nachos file was StartProcess implemented? What kind of pages in a process’ virtual address space are usually protected as “Read Only”? Is it possible to implement a file system inside of a file stored in another file system?In a main memory-disk virtual storage system, the page size is 1KByte and the FIFO algorithm is used for page replacements. A given program has been allocated three page frames in the main memory and it makes the following 16 memory references when it starts executing (the addresses are given in decimal):500, 2000, 2500, 800, 4000, 1000, 5500, 1500, 2800, 400, 5000, 700, 2100, 3500, 900, 2400 Fill in the contents of the three page frames after each memory reference in a table and calculate the hit ratio. Hint: denote by 'a' the page consisting of locations 0 through 1023 in memory. Similarly, b: 1024-2047, c: 2048-3071, d: 3072-4095, e: 4096-5119 and f: 5120-6143. Round to three decimal places.When allocating process execution to the I/O queue, what are the advantages of doing so first? If the I/O is interrupted, what do you believe will happen? Will this have an impact on the CPU's burst rate? What do you mean by that?
- Answer the following short questions to the point. Which bit in the PTE does the operating system use for approximating LRU replacement? Does a TLB miss always/sometimes/never result in a paging from disk? What are the two components of a virtual address used in segmented virtual memory? In what Nachos file was StartProcess implemented?To what extent does disk write caching benefit from the following?Which bit in the PTE does the operating system use for approximating LRU replacement? Does a TLB miss always/sometimes/never result in a paging from disk? What are the two components of a virtual address used in segmented virtual memory? In what Nachos file was StartProcess implemented? What kind of pages in a process’ virtual address space are usually protected as “Read Only”? Is it possible to implement a file system inside of a file stored in another file system?
- Suppose your company has decided that it needs to make certain busy servers 30% faster. Processes in the workload spend 70% of their time using the CPU and 30% on I/O. In order to achieve an overall system speedup of 30%:Q.) How much faster does the disk need to be?Both disks and main memory support direct access to any desired location (page). On average, main memory accesses are faster, of course. What is the other important difference between the two (from the perspective of the time required to access a desired page)?Consider a hypothetical system that uses Direct Memory mode access(DMA) mode to transfer the data from the hard disk to the main memory. If the size of the DMA controller's data count register is 32 bits. A file of 1024 GB needs to transfer from disk to memory. What is the minimum number of times the DMA controller needs to get the control of the system bus if the system is byte-addressable?