Computational Aerodynamics Based on the Euler Equations - download pdf or read online

By J.W. Slooff and W. Schmidt (Eds.)

ISBN-10: 9283610059

ISBN-13: 9789283610052

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Hence, it is important to manage cache carefully. 2 2 The techniques developed to accomplish this task are useful for sequential programming, too. 2 Chapter 1 Implications of Private Cache Memory In a uniprocessor system, new values computed by the processor are written back to cache, where they remain until their space is required for other data. At that point, any new values that have not already been copied back to main memory are stored back there. This strategy does not work for SMP systems.

Each portion of code enclosed by a parallel construct is called a parallel region. OpenMP expects the application developer to give a high-level specification of the parallelism in the program and the method for exploiting that parallelism. Thus it provides notation for indicating the regions of an OpenMP program that should be executed in parallel; it also enables the provision of additional information on how this is to be accomplished. The job of the OpenMP implementation is to sort out the low-level details of actually creating independent threads to execute the code and to assign work to them according to the strategy specified by the programmer.

When Can the Work Be Shared? Not every loop can be parallelized in this fashion. It must be possible to determine the number of iterations in the loop Overview of OpenMP 27 upon entry, and this number may not change while the loop is executing. Loops implemented via a while construct, for example, may not satisfy this condition. Furthermore, a loop is suitable for sharing among threads only if its iterations are independent. By this, we mean that the order in which the iterations are performed has no bearing on the outcome.

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Computational Aerodynamics Based on the Euler Equations by J.W. Slooff and W. Schmidt (Eds.)


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