Articolo in rivista, 2002, ENG, 10.1109/71.995820

Optimal tree access by elementary and composite templates in parallel memory systems

Auletta V.; Das S.K.; De Vivo A.; Pinotti M.C.; Scarano V.

Dipartimento di Informatica ed Applicazioni RM Capocell, Università di Salerno, Salerno, Italy; University of Texas, Deptartment of Computer Science & Engineering, Arlington, Texas, US; Dipartimento di Informatica ed Applicazioni RM Capocell, Università di Salerno, Salerno, Italy; Università di Trento, Dipartimento di Informatica & Telecomunicazioni, Trento - CNR-ISTI, Pisa, Italy; Dipartimento di Informatica ed Applicazioni RM Capocell, Università di Salerno, Salerno, Italy

In this paper, we study efficient strategies for mapping onto parallel memory systems complete trees that are accessed by fixed templates (like complete subtrees, paths, or any combinations their of). These mappings are evaluated with respect to the following criteria: (1) the largest number of data items that can be accessed in parallel without memory conflicts; (2) the number of memory conflicts that can occur when accessing templates of size equal to the number of available memory modules, thereby exploiting the full parallelism of the system; (3) the complexity of the memory addressing scheme, i.e., the cost of retrieving the module where a given data item is mapped. We show that there exist trade-offs between these three criteria and the performance of different mapping strategies depends on the emphasis given on each of these criteria. More specifically, we describe an algorithm for mapping complete binary trees of height H onto M memory modules and prove that it achieves the following performance results: (1) conflict-free access to complete subtrees of size K and paths of size N such that N + K - [log K] /spl les/ M; (2) at most 1 conflict in accessing complete subtrees and paths of size M; (3) O(K/M + c) conflicts when accessing a composite template of K nodes consisting of c disjoint subsets, each subset being a complete subtree, or a path or a set of consecutive nodes in a level of the tree.

IEEE transactions on parallel and distributed systems (Print) 13 (4), pp. 399–411

Keywords

Complete trees, Composite templates, Conflict-free access

CNR authors

Pinotti Maria Cristina

CNR institutes

ISTI – Istituto di scienza e tecnologie dell'informazione "Alessandro Faedo"