A Modestly Parallel Model
ECMWF has run a parallel spectral model in daily production since 1985. Initially, this executed on a Cray X-MP/22 and later on a Cray X-MP/48. The degree of high-level parallelism so far exploited is low because it is sufficient to provide the basic need, that is minimum wall clock execution time in a production environment. However, low-level parallelism in the form of vectorised Fortran code is very substantial. 99% of all floating point operations are performed in vector mode.
KeywordsConvection Europe Expense
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