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IBM Journal of Research and Development  
Volume 29, Number 1, Page 49 (1985)
Nontopical Issue
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A hardware sort-merge system

by N. Takagi, C.-K. Wong
The hardware sort-merge system which can sort large files rapidly is proposed. It consists of an initial sorter and a pipelined merger. In the initial sorter, record sorting is divided into two parts: key-pointer sorting and record rearranging. The pipelined merger is composed of several intelligent disks each of which has a simple processor and some buffers. The hardware sort-merge system can sort files of any size by using the pipelined merger repeatedly. The key-pointer sorting circuit in the initial sorter requires only unidirectional connections between neighboring cells, instead of the usual bidirectional ones. The initial sorter can also generate sorted sequences longer than its capacity so that the number of merging passes can be reduced. A new data management scheme is proposed to run all merging passes in a pipelined fashion.
Related Subjects: Algorithms; Computer architecture