DYNAMICS

Chapter 1. Introduction

Chapter 2. Basic equations and discretization

Chapter 3. Semi-Lagrangian formulation

Chapter 4. Computational details

REFERENCES

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4.3 Performance

The following performance figures relate specifically to the operational version of the model run at horizontal resolution T213 with 31 levels on the 16-processor Cray Y-MP C90. With the model time-step set at 15 minutes the total CPU time per forecast day would be about 1.5 hours on a single processor, the corresponding elapsed time (excluding the post-processing) being 7 minutes when the work is shared amongst 16 processors. This represents a sustained computation speed of about 3.5 gigaflops

floating-point operations per second). The memory requirements are 49 Mwords of central memory plus 70 Mwords of secondary storage. Multitasking using 16 processors provides a speed-up factor of 13 compared with using a single processor. A typical operational 10-day forecast, including all the post-processing, takes 2 hours of elapsed time.

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08.04.2002