Leszek Kasprzyk

Application of a Parallel Virtual Machine for the Analysis of a Luminous Field

The article presents an exemplary solution of computation dissipation of luminous flux distribution in interiors, taking into account their multiple reflections, by means of a parallel virtual machine of cluster type. Communication between the processors was ensured by the PVM library operating under the operational system LINUX. Advantages and faults of the programs operating at the computers connected into the network making the cluster are discussed. An analysis of acceleration and efficiency of a concurrent program is carried out. During construction of the algorithm attention was paid to minimization of the number of transferred messages. Calculation examples are presented.

Parallel calculations applied to light field analysis

The paper presents examples of solutions of computation dissipation of luminous flux distribution in interiors, taking into account multiple reflections, carried out at a parallel machine of cluster type. The structure of homogeneous and heterogeneous clusters was discussed. For communication between the processes the PVM library was used, operating under the Linux operational system. Advantages and drawbacks of the programs operating at the computers connected into the cluster are discussed. Acceleration and performance of the concurrent program was analyzed. In designing the algorithm attention was paid to minimization of the volume of interchanged messages. In the case of the heterogeneous machine three algorithms were compared with each other. Examples of the calculation results are presented, and operation modes of the homogeneous and heterogeneous clusters are compared.

Optimization of the number and the distribution of high-frequency signal sources in radio networks

The paper focuses on the problem of optimization of the number and distribution of high-frequency signal sources in wireless computer networks operating in complex building objects. To perform the task, the heuristic of a modified genetic algorithm and the wave propagation model in indoor building environments were used. The results of the optimization process were presented for a sample multi-storey building object with a complex geometrical and material structure. Streszczenie. W referacie podjęto tematykę optymalizacji liczby i sposobu rozmieszczenia źródeł sygnału wysokiej częstotliwości bezprzewodowych sieci komputerowych w złożonych obiektach budowlanych. W realizacji zadania wykorzystano zmodyfikowaną heurystykę algorytmu genetycznego oraz model propagacji fali w środowiskach wnętrz budynków. Wyniki optymalizacji przedstawiono dla przykładowego wielokondygnacyjnego obiektu budowlanego o złożonej strukturze geometrycznej i materiałowej. (Optymalizacja liczby i rozmieszczenia źródeł sygnału wysokiej częstotliwości w sieciach radiowych). Słowa kluczowe: optymalizacja, sieci radiowe, algorytmy genetyczne, obliczenia równoległe.

Optimization of Complex Lighting Systems in Interiors with the Use of Genetic Algorithm and Elements of Paralleling of the Computation Process

The paper presents the application of a genetic algorithm to optimization of the costs related to complex lighting systems. A form of objective function, a group of constraints, and a method of their implementing into the computation algorithm are proposed. For purposes of analysis of the electromagnetic field in visible range the Boundary Elements Method is used. Some elements of the computation algorithm are proposed that may be organized in parallel, as well as a method of communication between the computer issuing an order for the computation process and the cluster-supervising computer. Example optimization calculation is carried out and discussed.

Using a Parallel Virtual Machine to Optimize Lighting Systems

The paper presents the possibilities of using a parallel virtual machine for cost optimization of complex lighting systems. The objective function includes entire costs of the lighting systems. In order to determine the distribution of the luminous flux in one of the optimization algorithms a heterogeneous virtual machine was used. Communication between the processes was effected with the help of the MPICH-2 library, operating under the LINUX SuSE 10.0 system. The results of example optimized computation, speedup and efficiency of a parallel algorithm analysis of electromagnetic field (visible range) are presented