What is the maximum number of jobs that can be in progress at once? (1 point) b) Compute the maximum and minimum number of tape drives that may be left idle as a result of this policy
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An octa-core processor has 83 attached tape drives. There is a large number of jobs submitted to the
system that each of them requires a maximum of 5 tape drives to complete execution. Assume each job
starts running with only 4 tape drives for a long period before requiring the 5th tape drive for a short period
towards the end of its operation. When a job is started, 5 drives are assigned immediately and are not
released until the job finishes. Assume that the scheduler in the OS will not start a job unless there are 5
tape drives available. Also assume an endless supply of such jobs.
a)
What is the maximum number of jobs that can be in progress at once? (1 point)
b)
Compute the maximum and minimum number of tape drives that may be left idle as a result of this policy
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- A multiprocessor with 10 processors has 36 attached tape drives. A number of jobs have been submitted to the system where each job requires a maximum of 6 drives in order to complete execution. Assume that each job starts running with only 4 drives for a long period before requiring the other 2 drives for a short period toward the end of its operation. Also assume an endless supply of those jobs. Assume the scheduler in the operating system will not start a job unless there are 6 tape drives available. When a job is started, 6 drives are assigned immediately and are not released until the job finishes. 5.1 What is the maximum number of jobs that can be in progress at once? 5.2 What is the maximum number of tape drives that may be left idle as a result of this policy? 5.3 What is the minimum number of tape drives that may be left idle as a result of this policy?SFJ Process Suppose we have a four (4) core processor and all processes are designed to be multi-threaded. Now, like all processors with more than one core, they have the ability to perform multiple tasks at the same time. If there are four (4) with the following CPU and I/O cycles according to the table below, calculate the times for the SJF scheduling process (view image): Where A,B,C,D correspond to A=6, B=3, C=5, D=8.A computer employs RAM chips of 512 x 16 and ROM chips of 1024 x 8. The computer system needs 4K bytes of RAM and 2K bytes of ROM along with interface unit of 128 registers each. A memory mapped I/0 configuration is used. The two higher order bits are assigned for RAM, ROM and interface as 00, 01 and 10 respectively. a) How many RAM and ROM chips are needed
- 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?A multiprocessor with 10 processors has 36 attached tape drives. A number of jobshave been submitted to the system where each job requires a maximum of 6 drives inorder to complete execution. Assume that each job starts running with only 4 drivesfor a long period before requiring the other 2 drives for a short period toward theend of its operation. Also assume an endless supply of those jobs.Assume the scheduler in the operating system will not start a job unless there are 6tape drives available. When a job is started, 6 drives are assigned immediately andare not released until the job finishes.5.1 What is the maximum number of jobs that can be in progress at once? 5.2 What is the maximum number of tape drives that may be left idle as a result of this policy?5.3 What is the minimum number of tape drives that may be left idle as a result of this policy?A multiprocessor with 10 processors has 36 attached tape drives. A number of jobshave been submitted to the system where each job requires a maximum of 6 drives inorder to complete execution. Assume that each job starts running with only 4 drivesfor a long period before requiring the other 2 drives for a short period toward theend of its operation. Also assume an endless supply of those jobs.Assume the scheduler in the operating system will not start a job unless there are 6tape drives available. When a job is started, 6 drives are assigned immediately andare not released until the job finishes.What is the maximum number of jobs that can be in progress at once?What is the maximum number of tape drives that may be left idle as a result of this policy?What is the minimum number of tape drives that may be left idle as a result of this policy?
- A computer system contains a big endian byte addressable memory system with 8 separate memory modules. Each memory module is 32 bits wide and contains 134217728 cells. Cells within each memory module are numbered 0 through 134217727. a) If the memory employs high order interleaving, what is the 32-bit memory address of cell 1048578 within module 3? b) If the high order interleaved memory uses little-endian instead of big-endian storage order, what is the 32-bit memory address of cell 511 within module 1? c) If the memory employs low order interleaving, what is the 32-bit memory address of byte 1048575 within module 2? Bytes are numbered starting from 0. Express the address in hex. d) What is the main advantage of using low-order interleaved memory compared to using high-order interleaved memory?A computer has instructions that require two bus cycles, one to fetch the instruction and one to fetch the data. Each bus cycle takes 250 nanoseconds and each instruction takes 500 nanoseconds (i.e., the internal processing time is negligible). The computer also has a disk with 16,512 byte sectors per track. Disk rotation time is 8.092 milliseconds. To what percentage of its normal speed is the computer reduced during DMA transfer if each DMA takes one bus cycle? Consider two cases: 8-bit bus transfer and 16-bit bus transfer.A computer has instructions that each require two bus cycles, one to fetch the instruc- tion and one to fetch the data. Each bus cycle takes 10 nsec and each instruction takes 20 nsec (i.e., the internal processing time is negligible). The computer also has a disk with 2048 512-byte sectors per track. Disk rotation time is 5 msec. To what percent of its normal speed is the computer reduced during a DMA transfer if each 32-bit DMA transfer takes one bus cycle?
- A computer with a 32-bit 3.5 gigahertz scalar non- pipelined CPU needs to invert the colors of a 150 KB bitmap image file located in the RAM. To do this, each bit of the image must be complemented (Os are converted to 1s and vice-versa). Assume every instruction undergoes the following stages and each stage uses one CPU clock cycle: • Fetch • Decode • Read from memory • Execute • Write to memory Instructions: For this assignment, you must calculate how much time the computer will need to invert the image with a single-core and a dual core CPU. Show and explain your calculations and assumptions in a short paper and answer the following questions: • Will there be any parallel slowdown? Why or why not? Length: 2-3 page explanatory papermulticore processor with 4 cores has 15 attached tape drives. There is a large number of jobs submitted to the system that each requires exactly 4 tape drives to complete execution. Assume that each job runs on 4 tapes for the entire duration of its execution. Also assume an endless supply of such jobs. The scheduler in the operating system will not start a job unless there are 4 tape drives available. When a job is started, 4 drives are utilized immediately for its execution and are not released until the job finishes. a) What is the maximum number of jobs that can be in progress at once? b) What are the maximum number of tape drives that may be left idle at a given time as a result of this policy? c) What are the minimum number of tape drives that may be left idle at a given time as a result of this policy?A single-CPU system has four processes, P1, P2, P3 and P4 in the ready queue. The execution times and I/O needs for these processes are given below. All times are in ms. (hint: when a process starts an IO operation, it is removed from the ready queue and put back at the end of the queue only when it completes its IO). Process P1: Arrives at 0ms, needs 23ms of CPU time. Performs I/O for 5ms after 10ms of its execution time, then another 5ms after 20ms of its execution time. Process P2: Arrives at 3ms, needs 12ms of CPU time. Performs I/O for 10ms after 5ms of its execution time. Process P3: Arrives at 1ms, needs 15ms of CPU time. Performs I/O for 1ms after 7ms of its execution time. Process P4: Arrives at 2ms, needs 8ms of CPU time. Performs I/O for 5ms after 4ms of its execution time. We assume that the CPU is idle if no one of these four processes is using it. Using Round Robin scheduling algorithm with a Time Quantum of 4ms and ignoring the context switch time, determine: a) The…