국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	The Characteristic Parameters of the NWT Computer System in the Local Memory Access
저자	Shigeki Hatayama
Keyword	Vector processing; Parallel processing; Local memory access; SISD/SIMD/MIMD computing; Synchronization overhead; Maximum performance; Half-performance length; Half-performance grain size; NWT
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001361t.pdf?id=NALTR0001361T
보고서번호	NAL TR-1361T
발행년도	1998.10
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	The NWT computer system available at the NAL since February 1993 comprises two system administrators,n processing elements (where n was 140 at the beginning, and is 166 at present) and a crossbar network, and operates as a distributed-memory message-passing MIMD computer. Each processing element itself is a vector computer. This paper reports measurements of two pairs of the characteristic parameters, (t-infinity,n1/2) and (t-infinity,s1/2), of the NWT with SIMD computing on a single processing element and with MIMD computing in the local memory access, respectively. Furthermore the significance of the obtained results is interpreted, and several hardware parameters are estimated. The obtained results in this paper apply only to the NWT system software during the period April to June 1993 after which substantial improvements have been achieved with the NWT performance.