Performance of a QR algorithm implementation on a multicluster of transputers

• Tipo: Artigo em Revista Científica Internacional
• Data: 1995

Autores

ferreira, fj (Autor) Outra; vasconcelos, pb (Autor) FEP; dalmeida, fd (Autor) Outra

Revista

Título: Computing systems in engineering

Vol. 6 Nº 4-5

Páginas: 363-367

ISSN: 0956-0521

Editora: Pergamon Press - Elsevier

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da computação e da informação

Outras Informações

ID Authenticus: P-001-GGX

DOI: 10.1016/0956-0521(95)00025-9

Abstract (EN): Some results of an implementation of the QR factorization by Householder reflectors, on a multicluster transputer system with distributed memory are presented, that show how important is the communication time between processor in the performance of the algorithm. The QR factorization was chosen as test method because it is required for many real life applications, for instance in least squares problems. We use a version of Householder transformation that is the basis for numerically stable QR factorization. The machine used was the MultiCluster 2 model of Parsytec which is distributed memory system with 16 Inmos T800 processors. The Hellos operating system was chosen because it provides transparency in CPU management. However it limits the sets of connecting topologies to be used. The results are presented in terms of speedup and efficiency, showing the importance of the communication time on the total elapsed time.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5