3) If we have 350 serial tasks and 352 parallel tasks, what should be the speedup if we use 45 processors compared to a single processor?
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3) If we have 350 serial tasks and 352 parallel tasks, what should be the
speedup if we use 45 processors compared to a single processor?
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- How does pipelining improve CPU efficiency? What’s the potential effect on pipelining’s efficiency when executing a conditional BRANCH instruction? What techniques can be used to make pipelining more efficient when executing conditional BRANCH instructions?2) If 278 tasks are serial and 1000 are parallel, what should be the speedup if we use 166 processors compared to if we use 48 processors?As an eight-core Processor only has a single memory channel, multitasking is problematic. The question then becomes, "How can we fix this?"
- Assume that every 18 months, the number of cores in a new generation of processors doubles. How much additional off-chip memory bandwidth will be required for a three-year-old processor to maintain the same level of per-core performance?Assume that every 18 months, the number of CPU cores accessible is doubled. How much more off-chip memory bandwidth will be necessary for a CPU to maintain the same level of per-core performance in three years?This is assuming that every 18 months, a new generation of processors has a capacity to double the number of cores. To maintain the current level of per-core performance in three years, how much more off-chip memory bandwidth will be required?
- Because of the limitations of having just one memory channel per core, multitasking on an eight-core CPU is challenging. Now, then, how can we fix this issue?Why do we need cache memory if we already have volatile memory in the form of RAM (Random Access Memory)? Transistors are used in both cache memory and RAM. Is it feasible to use just one kind of memory for all computer operations?As a sort-of prediction for your midterm assignment, how many CPU cores do you think is ideal? Hint: think about Amdahl's Law, which describes the theoretical maximum speedup for a parallel program.
- Let's say that the number of cores that can be used increases by one with each new generation of CPUs that comes out every 18 months. What percentage of additional off-chip memory bandwidth will be required in three years for a central processing unit to maintain the same level of per-core performance as it does today?Assume that every 18 months, the number of cores available on a new generation of CPUs is doubled. How much extra off-chip memory bandwidth will be required in three years to maintain the current level of per-core performance?Because a CPU with eight cores only has one memory channel, multitasking is problematic. What's the answer to this difficulty, then?"
