In some real - time systems which have mass of calculation to do and need to show the calculated results , the tasks of calculation and display are shared by two pcs in order to meet the demand for calculation speed . through high - speed data transmission , the calculated results and control command are transferred between the two pcs 在某些具有大量计算任务并需显示计算结果的实时系统中，为了满足计算速度的要求，可采用两台普通pc机并行工作，分担计算及显示任务，两pc机间通过高速数据通信完成计算结果和控制命令的相互传递。
On this basic , it come out rs485 , bitbus application casus to distribution watch system . this system make up real time watch system and data manage net system by bitbus communication to complete detract check and focus show function of high low electric power parameter . it take on task of background communication and proscenium data manage 该方案应用bitbus现场总线构成一个完整的实时监控和数据管理网络系统，完成高、低压配电室电力参数的分散检测和集中显示等功能，上位机同时承担后台通讯和前台数据管理任务，前后台并行工作，该方案在某汽车制造厂配电系统中得到了较好的应用。
It suits in 220 500kv voltage rank ’ s electrical power system breakdown recording . uses 32 - bit embedded microprocessor arm and the high speed dsp multi - tasking ; designs the fpga hardware data sampling controller to produce the control signals , and guarantee sampling precision ; may record 36 groups analog signals and 80 groups switches signals ; uses distributed and modular design distributionally , may dispersely install in the screen cabinet , also may be linked to a management computer or transfer data to the far control center through the 10m / 100m ethernet 它适合于220 500kv电压等级的电力系统故障录波。采用32位嵌入式微处理器arm与高速dsp并行工作;设计了fpga硬件数据采样控制器产生控制信号,保证采样精度;可以记录36路模拟量和80路开关量;采用分布式、模块化设计,可以分散安装在屏柜中,也可以通过10m / 100m以太网级连到一台所级计算机或远传到调度中心。
In the process of program designing , the multi test line scheduler is realized on the oriented object analyzing and designing combining with the multitasking concept ; the flexible designing can make the program be appropriate to any different inspecting line ; and the multithread concept can make two or more tasks executing at the same time in a program 在软件设计的过程中，采用面向对象的程序方法结合多进程的概念，为实现对多条检测线进行调度提供了良好的解决方案；采用柔性化设计思想使得软件对检测设备排布不同的检测线具有很好的适应性；多线程的概念实现测控系统中多任务的并行工作。
The narrow fan - beams are reset into parallel beam then the image reconstruction is conducted by parallel beam " convolution back projection algorithm , which combines the high scan efficiency with the convenience of image reconstruction . this paper analyses the parallelism in narrow fan - beam " convolution back projection algorithm , divides the task of image reconstruction into several subtasks , and discusses the parallelization of narrow fan - beam " decomposition and reset , parallel beam " convolution back projection , and image accumulation 对于窄角扇束扫描方式，把窄角扇束重排成平行束，再由平行束卷积反投影重建算法来重建图像，是把扫描的高效率和重建方式的简便易行很好的结合起来。本论文对窄角扇束卷积反投影算法进行了并行性分析，指出把图像重建任务分解为多个子任务并行工作，并在工作站机群上讨论了窄角扇束的分解、重排、平行束卷积反投影图像重建、图像合成的并行实现。
Nowadays , mono - line mode is adopted in most domestic motor vehicle safety performance detecting & control system . with the boom of motor vehicle , the efficiency of the existing mono - line is far from requirement , and instead , multi - lines mode turns popular in automobile safety testing supervisory control system 目前,国内的各类机动车检测站大都是单线工作,然而对于机动车数量急剧增加的社会现状来说,现有的单条检测线的效率已经远远不能满足要求,拥有多条检测线并行工作的大型机动车安全性能检测站将是社会需求的必然产物。
With numerical experiments , the main work in this study is as follows : ( 1 ) the building of network parallel numerical computing platforms based on pvm on win32 system , the setting of environmental variables , the startup of pvm and the configuration of virtual machine are discussed . ( 2 ) the methods for the design of network parallel numerical computing programs based on pvm on win32 system are relatively detailedly explored in this study , including the basic pvm programming patterns , the decomposition of workload , the design of communication and the numerical stability of pvm parallel numerical algorithms . ( 3 ) the emphases are not only put on the discussion of several important factors which affect the performance of pvm parallel programs , including load - balancing , communication costs , network performance , task granularity , computer ’ s memory capacity and the number of processors , but also on the corresponding strategies for improving the performance of pvm parallel programs 本研究结合具体的数值试验,主要完成了以下工作: ( 1 )探讨了pvmonwin32的网络并行数值计算平台的构架,并行环境变量的设置, pvm的启动及虚拟机的配置等; ( 2 )较详细地讨论了基于pvmonwin32的网络并行数值计算程序设计的方法及注意事项,包括pvm基本编程模式的研究、任务的分解、通信的设计及pvm并行数值算法的数值稳定性等; ( 3 )重点研究了影响pvm并行程序性能的几个重要因素,包括负载平衡、通信开销、网络性能、任务粒度、处理机个数以及处理机内存容量问题等,并提出了相应的策略,以最大限度地提高pvm并行程序的性能; ( 4 )针对基于pvmonwin32的由桌面pc机联网而成的网络并行计算环境中,处理机的运算速度较快而处理机间的通信相对较慢的实际情况,将求解线性方程组的gauss - jordan消去法与gauss列主元消去法结合起来,给出了网上高效并行求解稠密线性方程组的无回代gauss列主元消去法,其算法处理机间的通信开销较少,实现了负载平衡和各处理机间的全并行工作; ( 5 )在考察求解线性方程组的jacobi迭代法和gauss - seidel迭代法并行性能的基础上,将两者的优越结合起来,给出了基于pvm的微机网络并行计算环境下求解线性方程组的一种分组gauss - seidel并行迭代算法。
