New PDF release: An Introduction to Parallel Programming

By Tobias Wittwer

ISBN-10: 9071301788

ISBN-13: 9789071301780

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Com. VTUNE offers the functionality of a profiler, but can also measure the number of integer and floating point operations during a program call. Many supercomputers come with integrated counters for measuring performance. These make it very simple to assess performance. If you are lucky to have access to such a machine, the system’s documentation should contain information about performance measurement. Please note that the goal of parallelisation and optimisation is not to maximise the efficiency, but to minimise the runtime required for a program.

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In SHALE, the associated Legendre functions P¯n,m are only computed if the latitude ji is different from the previous latitude ji−1 . If the observations are sorted by latitude, this can improve the computation time considerably. This technique is used in many Fortran programs, often using Fortran’s SAVE statement, which saves the values of variables between subroutine calls. Be careful, though: subroutines making use of save and being called by parallel threads will result in wrong results. Because of this, SHALE saves ji−1 outside of the subroutine actually using it, with a private copy of the variable for every thread.

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An Introduction to Parallel Programming by Tobias Wittwer

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