A Basic-Cycle Calculation Technique for Efficient Dynamic Data Redistribution

—Array redistribution is usually required to enhance algorithm performance in many parallel programs on distributed memory multicomputers. Since it is performed at run-time, there is a performance trade-off between the efficiency of the new data decomposition for a subsequent phase of an algorithm and the cost of redistributing data among processors. In this paper, we present a basic-cycle calculation technique to efficiently perform BLOCK-CYCLIC(s) to BLOCK-CYCLIC(t) redistribution. The main idea of the basic-cycle calculation technique is, first, to develop closed forms for computing source/destination processors of some specific array elements in a basic-cycle, which is defined as lcm(s, t)/gcd(s, t). These closed forms are then used to efficiently determine the communication sets of a basic-cycle. From the source/destination processor/data sets of a basic-cycle, we can efficiently perform a BLOCK-CYCLIC(s) to BLOCK-CYCLIC(t) redistribution. To evaluate the performance of the basi...

• Type: Journal
• Year: 1998
• Where: TPDS
• Authors: Yeh-Ching Chung, Ching-Hsien Hsu, Sheng-Wen Bai
• Keywords: Basic-cycle Calculation Technique, Performance, TPDS 1998, —Array Redistribution