Abstract
In the following paper, we present a parallel implementation of an algorithm for the determination of electromagnetic field in a closed three-dimensional space. A homogenous dielectric and a remote radiation source are taken into consideration for region under scope. Computations were carried out on the two different systems: parallel MIMD computer - ALEX AVX2 and cluster system - network of PCs with MPI library and Windows NT system. Analysis of efficiency for proposed parallel algorithm was carried out in both cases. Based on obtained results we discuss on the advantages and disadvantages related to the use of parallel MIMD computer and cluster system in numerical computations.