%0 Journal Article %A Kwangho Cha and Hyeyoung Cho and Sungho Kim %D 2007 %J International Journal of Computer and Information Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 8, 2007 %T Performance Analysis of the Subgroup Method for Collective I/O %U https://publications.waset.org/pdf/1854 %V 8 %X As many scientific applications require large data processing, the importance of parallel I/O has been increasingly recognized. Collective I/O is one of the considerable features of parallel I/O and enables application programmers to easily handle their large data volume. In this paper we measured and analyzed the performance of original collective I/O and the subgroup method, the way of using collective I/O of MPI effectively. From the experimental results, we found that the subgroup method showed good performance with small data size. %P 2344 - 2347