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Keiser University Parallel Distribution Simple Worksheet

Keiser University Parallel Distribution Simple Worksheet

Keiser University Parallel Distribution Simple Worksheet


Question 1: List three major problems requiring the use of supercomputing in the following domains:

1.Structural Mechanics.

2.Computational Biology.

3.Commercial Applications

Question 2: Collect statistics on the number of components in state of the art integrated circuits over the years. Plot the number of components as a function of time and compare the growth rate to that dictated by Moore’s law.

Question 3: Repeat the above experiment for the peak FLOPS rate of processors and compare the speed to that inferred from Moore’s law.

Design an experiment (i.e., design and write programs and take measurements) to determine the memory bandwidth of your computer and to estimate the caches at various levels of the hierarchy. Use this experiment to estimate the bandwidth and L1 cache of your computer. Justify your answer. (Hint: To test bandwidth, you do not want reuse. To test cache size, you want reuse to see the effect of the cache and to increase this size until the reuse decreases sharply.)

Question 4: Consider a memory system with a level 1 cache of 32 KB and DRAM of 512 MB with the processor operating at 1 GHz. The latency to L1 cache is one cycle and the latency to

DRAM is 100 cycles. In each memory cycle, the processor fetches four words (cache line size is four words). What is the peak achievable performance of a dot product of two

vectors? Note: Where necessary, assume an optimal cache placement policy.

Question 5: Now consider the problem of multiplying a dense matrix with a vector using a twoloop dot-product formulation. The matrix is of dimension 4K x 4K. (Each row of the matrix takes 16 KB of storage.) What is the peak achievable performance of this technique using a two-loop dot-product based matrix-vector product?

Question 6: Why is it difficult to construct a true shared-memory computer? What is the minimum number of switches for connecting p processors to a shared memory with b words (where each word can be accessed independently)?

Question 7: In the following description, explain when the term account is used as an application domain concept and when as a solution domain concept:

“Assume you are developing an online system for managing bank accounts for mobile customers. A major design issue is how to provide access to the accounts when the customer cannot establish an online connection. One proposal is that accounts are made available on the mobile computer, even if the server is not up. In this case, the accounts show the amounts from the last connected session.”

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