document: Optimization of element-by-element FEM in HPF 1.1 In this study , Poisson 's equation is numerically evaluated by the element-by-element -LRB- EBE -RRB- finite-element method in a parallel environment using HPF 1.1 -LRB- High-Performance Fortran -RRB- . In order to achieve high parallel efficiency , the data structures have been altered to node-based data instead of mixtures of node - and element-based data , representing a node-based EBE finite-element scheme -LRB- nEBE -RRB- . The parallel machine used in this study was the NEC SX-4 , and experiments were performed on a single node having 32 processors sharing common memory . The HPF compiler used in the experiments is HPF/SX Rev 2.0 released in 1997 -LRB- unofficial -RRB- , which supports HPF 1.1 . Models containing approximately 200 000 and 1,500,000 degrees of freedom were analyzed in order to evaluate the method . The calculation time , parallel efficiency , and memory used were compared . The performance of HPF in the conjugate gradient solver for the large model , using the NEC SX-4 compiler option-noshrunk , was about 85 % that of the message passing interface
doc_bio_tags: O O O O O B O O O O O O O O O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B O O B I I O O O O O O O O O O O O O O O O O O O B I O
extractive_keyphrases: hpf compiler conjugate gradient solver message passing hpf
abstractive_keyphrases: finite element method parallel programs poisson equation element-by-element