Reseatch of a Distributed Environmnet for Numerical Simulation in Theoretical Astrophysics

近年来，由于数字技术的飞速发展，人们获得了大量高质量的天体图像。为了了解这些物体中发生了什么样的现象，强烈需要基于物理学基本定律进行数值模拟。观测图像越精细，数值计算所需的内存大小和计算速度就越快。然而，人们需要工作站来利用这样一个大型超级计算机系统。近年来，计算机技术的发展为我们提供了速度很快的小型计算机，本研究旨在阐明如何利用我们身边的小型计算机进行理论天体物理的数值模拟，特别是在分布式环境中，计算机通过通用计算机网络连接起来。还阐明了专用计算机在这种分布式计算环境中作为计算服务器是有效的。 ...更多信息 对1996年1月安装在日本国家天文台天文数据分析中心的具有矢量化并行CPU的超级计算机系统进行了研究。该系统作为一个分布式计算系统进行了分析和评价，该系统是非常有效的处理理论数值模拟在天文学。与大量的主存相比，高性能存储空间的容量相当小，最大使用量约为30GB。通过以上研究，明确了一个从工作站到高端计算机服务器的系统化操作体系。今后，需要明确天体物理数值模拟应准备什么样的用户环境，并找出什么样的计算机体系结构和操作系统将适用于天文计算。少

Due to a gross development in digital technolygies, there have been obtained many and fine images of astronomical objects, recently. In order to understand what kind of phenomenon occurs in those objects, it is strongly required to carry out numerical simulations based ot basic laws in physics. The finer the observational images, the larger the size of memory and faster computation required for the numerical computations. While, one needs workstations to utilize such a large supercomputer system. Recent development in such technology gives us so fast small computers.In this research, it is clarified that how those small computers around us can be effective in poroceeding numerical simulations in theoretical astrophysics, especially in a distributed environment in which computers are connected through general purpose computer network. It is also clarified that special purpose computers are effective as computation servers in this distributed computaional environment.First, a detailed in … More vestigation on the supercomputer system with vectorized-parrallel CPU's which has been installed at the Astronomical Data Analysis Center, NAOJ,in january 1996. This system is analyzed and evaluated as a distributed computing system, and the system is very effective for processing theoretical numerical simulations in astronomy. There are rather small amount of high performace storage compared to the large amount of main memory, that is about 30GB at maximal usage.It is also investigates how the special purpose computers of Cosmic Fluid Dynamics computtations are reviewed. There also find a new algorithm for utilizing such special purpose computer not only in the fluid dynamics calculation but also in a radiative transfer computation.Through the research mentioned above, there has been clarified a systematic operating system which covers from workstations to the high-end computer server. In future, it is required to clarify what kind of user environment should be prepared for numerical simulation in astrophysics, and also to find out what kind of computer architecture and operating system will be suitable for astronomical computation. Less