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The PVM (Parallel Virtual Machine) system is used to handle communications among networked workstations.


These security problems significantly affect the security of the virtual machine system based on XEN.


The well know Parallel virtual Machine system which provides one of the more often used API for communications.


In a virtual machine system, guest VMs run on emulated hardware and the virtual machine monitor has access to the entire state of each guest VM.


In particular, we analyze several of the design features of the PVM Parallel Virtual Machine system.

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 It is important to well understand the debugged parallel program in researching and developing its parallel debuggers.Although many parallel debuggers define events to be occurrence instances of program actions,little of them give the complete definition of action. PVM(Parallel Virtual Machine) system is analyzed, and concrete actions are defined,which are used to describe a unified PVM debugged object model for PVM.A same debugged object can be provided in all debugging periods when using... It is important to well understand the debugged parallel program in researching and developing its parallel debuggers.Although many parallel debuggers define events to be occurrence instances of program actions,little of them give the complete definition of action. PVM(Parallel Virtual Machine) system is analyzed, and concrete actions are defined,which are used to describe a unified PVM debugged object model for PVM.A same debugged object can be provided in all debugging periods when using this model,this makes parallel debugging more easy.  研究了ＰＶＭ（ＰａｒａｌｅｌＶｉｒｔｕａｌＭａｃｈｉｎｅ）系统，利用活动（ａｃｔｉｏｎ）概念具体定义了ＰＶＭ应用程序的活动，从而描述出一种新型的ＰＶＭ调试对象模型，使得在调试的各阶段能够对相同的调试对象采用不同的调试方法，简化了调试工作．  In this paper, we consider a full coupled multi phase problem involving heat and mass transfer in deforming porous media. The mathematical model consists of balance equations of mass, linear momentum and energy and of the appropriate constitutive equations. The chosen macroscopic field variables are temperature, capillary pressure, gas pressure and displacement. The gas phase is considered to be an ideal gas composed of dry air and vapour, which are regarded as two miscible species. The model makes further... In this paper, we consider a full coupled multi phase problem involving heat and mass transfer in deforming porous media. The mathematical model consists of balance equations of mass, linear momentum and energy and of the appropriate constitutive equations. The chosen macroscopic field variables are temperature, capillary pressure, gas pressure and displacement. The gas phase is considered to be an ideal gas composed of dry air and vapour, which are regarded as two miscible species. The model makes further use of a modified effective stress concept together with the capillary pressure relationship. Phase change is taken into account as well as heat transfer though conduction and convection and latent heat transfer (evaporation condensation). Discretization of the non linear governing equations is carried out by means of finite elements in space and finite differeces in time. A multi frontal parallel method in conjunction with a Newton Raphson procedure is developed to solve above problem. The given domain of the problem is descretized into a finite number of subregions or subdomains. Multi fronts are used to assemble and eliminate internal variable concurrently in every subregion. The contributions for interface equations are obtained from the frontal operating arrays when every wavefront comes to the boundary of its own subregion. Interface equations are solved to obtain the values of the boundary nodes of the subregion. Once the values of the boundary nodes have been determined, the values within each subregion may be determined by a back substitution routines of the multi frontal procedures independently. This method has advantages shch as numbering of the finite element mesh in an arbitrary manner, simple programming organisation, smaller core requirements and shorten computation times. The parallel program is developed on Dawning Tiangchao (1000A) parallel computer. The PVM(Parallel Virtual Machine) system is used to handle communications among processors. Numerical examples are given to demonstrated the speedup and efficiency of this method.  研究了孔隙介质中热、水和汽流全耦合分析的并行计算方法．模型中采用了考虑毛细压力关系的修正有效应力概念，并考虑了相变和潜热传递．基本变量为位移、毛细压力、汽压和温度．并行程序是在国家高性能计算中心（北京）的曙光１０００Ａ上借助ＰＶＭ（ＰａｒａｌｅｌＶｉｒｔｕａｌＭａｃｈｉｎｅ）软件系统实现的，考题显示出较高的并行加速比和效率  This paper presents a new parallel scheme on finite element analysis, in which an algebraic multigrid algorithm in conjunction with block iteration technique and multifrontal technique is developed to solve finite matrix equations. This method has advantages such as numbering of the finite element mesh in an arbitrary manner, simply programming organization, smaller core requirements and shorter computation time. The parallel program is developed on Dawning Tiangchao 1000A parallel computer. The PVM(Parallel... This paper presents a new parallel scheme on finite element analysis, in which an algebraic multigrid algorithm in conjunction with block iteration technique and multifrontal technique is developed to solve finite matrix equations. This method has advantages such as numbering of the finite element mesh in an arbitrary manner, simply programming organization, smaller core requirements and shorter computation time. The parallel program is developed on Dawning Tiangchao 1000A parallel computer. The PVM(Parallel Virtual Machine) system is used to handle communications among processors. Numerical examples are given to demonstrate the speedup and the efficiency of this method.  提出一种新的有限元并行计算格式 ,将代数多重网格、块迭代与多波前技术综合用于有限元分析 ,具有不限制节点编号顺序、编程简单、存储量小和计算时间少的优点 .并行程序是在国家高性能计算中心 (北京 )的曙光 1 0 0 0 A上借助 PVM(Parallel Virtual Machine)软件系统实现的 ,PVM系统用于处理各计算节点间的通信 .考题显示出较高的并行加速比和效率   << 更多相关文摘 
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