The NWT (Numerical Wind Tunnel) 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 (Multiple Instruction and Multiple Data stream) computer. Each processing element itself is a vector computer. This paper reports measurements of two pairs of the characteristic parameters, (r(sub infinity), n(sub 1/2)) and (circumflex-r(sub infinity), circumflex-s(sub 1/2), f(sub 1/2)), of the NWT with the communication performance between the global and local memory spaces through the medium of the crossbar network and with MIMD computing in the global memory access, respectively. The significance of the results is interpreted, and several hardware parameters are estimated. The results in this paper apply only to the NWT system software during the period April to June 1993.
Characteristic parameters of the NWT computer system in global memory access
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