Effective I/O bandwidth benchmark (b-eff-io).

Koniges, A. E. ; Rabehseifner, R.

Technical Information Center Oak Ridge Tennessee

关键词: Benchmarks;    Buffers;    Parallel processing;    Computers;    Programming;   

RP-ID  :  DE2001757N55

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The effective I/O bandwidth benchmark (b(-)eff(-)io) covers two goals: (1) to achieve a characteristic average number for the I/O bandwidth achievable with parallel MPI-I/O applications, and (2) to get detailed information about several access patterns and buffer lengths. The benchmark examines 'first write' 'rewrite'; and 'read' access, strided (individual and shared pointers) and segmented collective patterns on one file per application and non-collective access to one file per process. The number of parallel accessing processes is also varied and wellformed I/O is compared with non-wellformed. On systems, meeting the rule that the total memory can be written to disk in 10 minutes, the benchmark should not need more than 15 minutes for a first pass of all patterns. The benchmark is designed analogously to the effective bandwidth benchmark for message passing (b(-)eff) that characterizes the message passing capabilities of a system in a few minutes. First results of the b(-)elf(-)io benchmark are given for IBM SP and Cray T3E systems and compared with existing benchmarks based on parallel Posix-I/O.