Clive Temperton

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We study the efficacy of spectral preconditioning (of iterative Krylov-subspace solvers) in extreme settings covering a broad range of scales and physical applications, in the context of a massively parallel nonhydrostatic fluid model. We find that while elementary spectral preconditioners offer advantages in certain classes of applications, in general,(More)
Prime factor fast Fourier transform (FFT) algorithms have two important advantages: they can be simultaneously self-sorting and in-place, and they have a lower operation count than conventional FFT algorithms. The major disadvantage of the prime factor FFT has been that it was only applicable to a limited set of values of the transform length N. This paper(More)
During the past five years I have had the good fortune to be able to work on two of the world's fastest computers, the Cray-1 (at the European Centre for Medium Range Weather Forecasts) and the Cyber 205 (at the UK Meteorological Office). A comparison between the two machines is clearly of interest not only to potential users but also to a more general(More)
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