Figure 3

Grid Middleware functioning. This figure shows how the different parts of the system interact among each other to complete the objectives of the Grid Middleware. To start the system, the end user interacts with the node search system through the interface. Using calls through shell script to Condor scheduler, the node search system retrieves information on nodes in a computational grid and submits them to the user. The user selects the nodes for computation and specifies the input data set and the local directory that will contain the remote computing results. At this point, the user selects the SIMD application that will be distributed in the grid from a lists of SIMD Applications. Once these specifications have been fixed, the load balancer analyzes the input data set and the node set, which are to be used for the remote computing, and provides a peer distribution of the workload on the different nodes of the grid computing. After carrying out this subdivision, the transfer optimizer makes a compression of the data set and instruction set to send to different remote nodes. Following the compression operations, the remote computation on the different grid system nodes is started by calls to the shell script system. At the end of the remote computing, each node performs local compression of the computing results, and at this point, middleware recovers the compressed results and makes them available in decompressed form on the end user node.