From WWW To GGG

This paper introduced the future in detail the development of the thirdgenerations network--grid:lts history origins, process, domestic and internationalresearch present condition and its function and preliminary tools that now developed. This text include totally five parts: summry of grid, grid calculation model, grid technique based on OGSA, China grid, grid calculation example.The first part tells us, grid technique different from Internet and NGI (the next generation internet)released in 90's middle last century in the United States, because of difference of the development aims of them.The Internet2 and the NGI mainly raise tranportation rate( increase 100 ~ 1000 times) and have the stronger function , more Web addresses with safer performance, realize real information highway in fact.So adopting' the new network protocol IPv6 for this, its a prototype still a TCP/ IP.The purpose of development of grid is to links all networks resources, realizing the resources share, cooperation with different sites in other land , the support open the standard, dynamic variety in function. Protocol standards it adopts is also different with others.Its final target is to set up a super virtual computer, realizing Service on Demand One Click Is Enough.The second part contain sand filter model, the model of Globus, module model, the model of OGSA, the computing pond model, the model of CPU, nerve network model.grid is the best complicated system that mankind will finish, it also should follow system science method in computer science:From abstract( the system sets up the model), theories( model examination), design.( the model realizes).People put forward many models of grid, but the examination in theorety is few, grid realizes appear a trend that is from two ends to midst: organization with nonprofit studying grid develop the .new technique continuously under frames of grid model and architecture, use new techniche applyed in interenet at the same;On the other hand, IT profiting organizations try hard to develop the new operation system and application platform in the direction of grid .The third part is grid technique based on OGSA, the OGSA is a kind of Open Grid Services Achitecture, is a output of Web Services combination with the Grid technique, have become the grid foundation crilerion.Globus Toolkit tool software , grid tansportation protocol language( GTPL) is core part of OGSA .The Globus Toolkit includes below several parts:The GRAM( Globus Resource Allocation Manager), GSI( Grid Security Infrastructure), MDS( The Metacomputing Directory Service), GASS( Global Access to Secondary Storage), I-JBM( Heartbeat Monitor).The fourth part is Chinaneth, grid in our country has been studied preparatorily from both software and hardware and will being continuouslly developed:An is an calculation environmental designed in high performance, theanother is Vega grid.Along with the fast development of application demand in high performance, a single computer with high performance can not perform solution of some super and large-scale application problem.This need combine various calculations resources of isomerization in distributed geography,through the super-speed network links, to solve large scale application problem.That is Metacomputing. in wide area high performance.The fifth part is an grid calculation example, GT3 is a Globus Toolkits.0, Open Source Software ,provided by the Globus Alliance, it includeds software service and program library that are used to search, discovers and manage resources .Making use of GTS to execute a programm.