### 电子工程代写|计算机系统原理代写Principles of Computer Systems代考|CS6411

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• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 电子工程代写|计算机系统原理代写Principles of Computer Systems代考|Synchronous Communication of Processes

The instruction set in Fig. $1.3$ is extended with the following instructions:
As shown in Fig. 1.4, process P1 sends the value of its variable $n$ to process P2, which assigns this value to its variable $m$ (in the original CSP notation, $n$ is an expression, but $m$ must be a variable; so the joined action of P1 and P2 is, in fact a distributed assignment statement $m:-n$ ). The transmission of the value of variable $n$ from P1 to P2 takes place, when instructions P2! $n$ and P1? $m$ are being executed jointly, that is when control of both processes reached these actions. Such ,meeting” of the processes is called their handshaking, or randezvous: when one program is ready to communicate and its partner is not, then the former waits until the latter be ready. This is called a synchronous communication whose principle is depicted in Fig. 1.5. Such mechanism has been implemented in many programming languages, for instance in ADA, OCCAM and a number of more commonly used like Java, $\mathrm{C}++$, etc.

Notice that such communication is speed-insensitive (computing result is independent of relative computation speed of computers) and resembles a phone call: the caller waits until the callee picks up the telephone receiver.

As an example consider a system of two-computers, which computes the greatest common divisor (gcd) of two integer numbers, where at least one is not 0 . Its execution as consecutive states, is shown in Table 1.6. Since the task is not so trivial as the previous exemplary parallel computing of a simple assignment statement and more instructive for its algorithmic and program parallelization aspects, let us devote a little more attention to it.

## 电子工程代写|计算机系统原理代写Principles of Computer Systems代考|Asynchronous Communication of Processes

In order to explain the principle of asynchronous communication, let us imagine the following organization of its participants. Each program has a mailbox of messages delivered by senders to it. The mailbox is partitioned into pigeon-holes, each assigned to one sender and containing a queue of messages sent by this sender. The receiver of these messages, when needs a message from a certain sender, takes it from a queue assigned to this sender-if the queue is nonempty. Otherwise, the receiver waits until the sender dispatches the message to this queue. So, unlike in synchronous communication, the sender is not suspended until receiver gets the message, but continues activity, and symmetrically for the receiver-unless its respective queue is not empty.
The instruction set is extended with two instructions shown in Fig. 1.7.
The asynchronous communication mechanism has been implemented for some programming languages (in their syntax or libraries), like LINDA Carriero et al. (1986), Carriero and Gelernter (1989), some extensions of COBOL and even the old Fortran and a number of newer, like C#, Visual Basic, JavaScript and some others. The principle of asynchronous communication is depicted in Fig. 1.8.

## 广义线性模型代考

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。