并行计算 期末考试模拟题原题
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Reviews on parallel programming并行计算英文班复习
考试范围及题型:(1—10章)
1 基本概念解释;Translation (Chinese)
2 问答题。Questions and answer
3 算法的画图描述。Graphical description on algorithms
4 编程。Algorithms
Reviews on parallel programming并行计算
1 基本概念解释;Translation (Chinese)
SMP
MPP
Cluster of Workstation
Parallelism,
pipelining,
Network topology,
diameter of a network,
Bisection width,
data decomposition,
task dependency graphs
granularity
concurrency
process
processor,
linear array,
mesh,
hypercube,
reduction,
prefix-sum,
gather,
scatter,
thread s,
mutual exclusion
shared address space,
synchronization,
the degree of concurrency,
Dual of a communication operation,
2 问答题。Questions and answer
Chapter 1 第1章
1) Why we need parallel computing? 1)为什么我们需要并行计算?
答:
2) Please explain what are the main difference between parallel computing and sequential computing 2)解释并行计算与串行计算在算法设计中的主要不同点在那里?
答:
Chapter 2 第2章
1) What are SIMD, SPMD and MIMD denote? 1)解释SIMD, SPMD 和 MIMD是什么含义。
答:
2) Please draw a typical architecture of SIMD and a typical architecture of MIMD to explan. 2)请绘制一个典型的SIMD的体系结构和MIMD的架构。
答:
3) What are the two typical communication models of Parallel Platforms? You can give a short introduction on Massage Passing and Shared address space models.
3)并行平台的两个典型的通信模式是什么?你可以给一个简短的介绍信息传递和共享地址空间模型。
能说出Massage Passing和Shared address space models两种通讯模型。
答:
4) In the ideal parallel random access machine(PRAM), what are the meaning of EREW, CREW and CRCW?
4)在理想并行计算模型中(parallel random access machine(PRAM), EREW, CREW, 和CRCW表示的意思是什么?
答:
Chapter 3 第3章
1) Be able to explain at least 2 kinds of the basic decomposition techniques, i.e., Recursive decomposition, Data decomposition, Exploration decomposition and Speculative decomposition.
1)能够解释的基本的把问题分解技术,至少有2种,例如,递归分解,数据分解,探索分解和投机分解。
(1)递归分解,如快速排序
(2)数据分解,矩阵乘法,矩阵与向量的乘法,按行或格网的数据划分。
(3)探索分解,人工智能中的状态空间的问题求解、如16数码问题。
(4)投机分解,利用处理器大多数时间处于空闲的特点,把后面可以先计算的任务,提前计算出,在许多情况下会加速程序的运行。如对 case, if 语句的句子同时计算出来。
答:
2) When the work balance of tasks become bed, which is scheduled based on data decomposition, what methods can improve the work balance of tasks, block-cyclic distribution, Randomized block distributions and graph partitioning.
2)当平衡工作的任务成为基于数据分解,有什么方法可以改善平衡工作的任务。
对稀疏矩阵或在同一数据集合上,操作密度不同的计算,如何达到调度平衡的问题, 具体方法是什么:(1)block-cyclic distribution (采用在一个矩阵上循环安排任务计算完成的方法) (2)对矩阵的下标采用随机映射的方法 (3)图划分的方法
答:
Chapter 4 第4章
1) Be familiar with the basic communication operations as well as their implementations on the typical models, hypercube, linear array and mesh (graphical description)
1)熟悉的基本通信业务,以及对他们的典型模式实现,超立方体,线性阵列和网状(图形描述)
one to all broadcast; all to one reduction
all to all broadcast; all to all reduction
scatter, gather, all reduce, prefix sum,
all to all personalized communication. Circular shift
个人认为以下的1-4更为重要,算法实现没必要记住,但是要知道每个操作具体是怎么做的
答: