奥鹏教育云南开放大学计算机专业英语（）第2形考作业7

奥鹏云南开放大学平时在线作业

计算机专业英语（20春）第2学期形考作业7

Most computer operating system in use today, including all consumer-targeted systems ,include a TCP/IP_____.
A:plan
B:requirement
C:implementat-ion
D:design
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It is commonly also known as TCP/IP, named from two of the most important protocols in it: The Transmission Control Protocol and _____.
A:An identifier
B:the Internet Protocol(IP)
C:An array
D:ITP
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This passage is mainly talking about______.
A:Internet Protocol Suite
B:a control
C:pipelining
D:producing
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The TCP/IP model consist of____ layers.
A:three
B:six
C:four
D:two
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Thefunctional groups of proto奥鹏云南开放大学平时在线作业cols and methods are________ , the Transport layer, the Internet Layer, and the Link Layer.
A:Active X
B:XML
C:HTML Layer
D:the Application Layer
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The term "optimization" in compiler designrefers tothe attemptsthat a compiler makes to produce code that is more efficient than the obvious code. "Optimization" is thus a misnomer, since there is no way that the code produced by a compiler can be guaranteed to be as fast or faster than any other code that performs the same task.　　In modern times, the optimization of code that a compiler performshas become both more importantand more complex. It is more complex because processor architectures have become more complex, yielding more opportunities to improve the way code executes.It is more important because massively parallel computers require substantial optimization, or their performance suffers by orders of magnitude. With the likely prevalence of multicore machines (computers with chips that have large numbers of processors on them), all compilers will have to face the problem of taking advantage of multiprocessor machines.　　It is hard, if not impossible, to build a robust compiler out of “hacks”.Thus, an extensive and useful theory has been built up around the problem of optimizing code. The use of a rigorous mathematical foundation allows us to show that an optimization is correct and that it produces the desirable effect for all possible inputs.We shall see, starting in Chapter 9, how models such as graphs, matrices, and linear programs are necessary if the compiler is to produce well optimized code.
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