Machine Theory

Algorithmic Differentiation of Pragma-Defined Parallel by Michael Förster PDF

Posted On April 5, 2018 at 8:29 am by / Comments Off on Algorithmic Differentiation of Pragma-Defined Parallel by Michael Förster PDF

By Michael Förster

ISBN-10: 3658075961

ISBN-13: 9783658075965

ISBN-10: 365807597X

ISBN-13: 9783658075972

Numerical courses frequently use parallel programming suggestions reminiscent of OpenMP to compute the program's output values as effective as attainable. furthermore, spinoff values of those output values with admire to yes enter values play a very important function. to accomplish code that computes not just the output values at the same time but in addition the by-product values, this paintings introduces numerous source-to-source transformation ideas. those principles are according to a method known as algorithmic differentiation. the focus of this paintings lies at the very important opposite mode of algorithmic differentiation. The inherent data-flow reversal of the opposite mode needs to be dealt with competently in the course of the transformation. the 1st a part of the paintings examines the changes in a really normal manner due to the fact that pragma-based parallel areas happen in lots of other forms equivalent to OpenMP, OpenACC, and Intel Phi. the second one half describes the transformation principles of crucial OpenMP constructs.

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Extra resources for Algorithmic Differentiation of Pragma-Defined Parallel Regions: Differentiating Computer Programs Containing OpenMP

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In addition, when a lastprivate clause appears on the directive that identifies a worksharing construct, the value of each new list item from the sequentially last iteration of the associated loops, or the lexically last section construct, is assigned to the original list item. The original list item becomes defined at the end of the construct if there is an implicit barrier at that point. To avoid race conditions, concurrent reads or updates of the original list item must by synchronized with the update of the original list item that occurs as a result of the lastprivate clause.

1 #pragma omp p a r a l l e l 2 { 3 ... 4 w h i l e ( i ≤ ub ) { 5 j←0; 6 w h i l e ( j

98). "The firstprivate clause declares one or more list items to be private to a task, and initializes each of them with the value that the corresponding original item has when the construct is encountered. The syntax of the firstprivate clause is as follows: f i r s t p r i v a t e ( list ) The firstprivate clause provides a superset of the functionality provided by the private clause. [. ] In addition, the new list item is initialized from the original list item before the construct. The initialization of the new list item is done once for each task that references the list item in any statement in the construct.

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Algorithmic Differentiation of Pragma-Defined Parallel Regions: Differentiating Computer Programs Containing OpenMP by Michael Förster

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