Evaluation of the CRAY-1 computer [electronic resource].
- Los Alamos, N.M. : Los Alamos Scientific Laboratory, 1977.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 15 : digital, PDF file
- Additional Creators:
- Los Alamos Scientific Laboratory
United States. Department of Energy. Office of Scientific and Technical Information
- A summary of the organization of the CRAY-1 computer is given together with an evaluation of its strengths and weaknesses based on current user experience with the machine. Some of the unique features of the organization of this computer are its vector registers, its intermediate scalar and address registers, and its use of only four different integrated circuits and only two different resistors. Its small number of distinct components leads to economy through volume purchases of parts, even for a single machine, and to reliability through simplified circuit design and mass production testing of components. Its vector registers lead to vector processing that has the same speed advantage over memory-to-memory vector processing that scalar processing in high-speed registers has over memory-to-memory scalar processing. Its intermediate scalar and address registers lead to very-high-speed scalar processing, a valuable characteristic uncommon in other vector and parallel computers. These registers are like a programable data cache; a simple scheme is described which makes them easily usable by compiler-generated code. Reliability estimates for the machine in a production environment are made based on results from a test workload. The increased reliability predicted for memory error correction is found to far outweigh its additional cost. Without any vector processing at all, the speed and price-performance advantage over older architectures is between a factor of two and a factor of three. For problems that make good use of the vector processing capabilities of the machine, the advantage is between a factor of two and a factor of ten. 3 figures.
- Published through SciTech Connect.
Symposium on high speed computer and algorithm organization, Urbana, IL, USA, 13 Apr 1977.
Keller, T.W.; Baskett, F.
- Funding Information:
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