Download e-book for iPad: Algorithmic Differentiation of Pragma-Defined Parallel by Michael Förster

By Michael Förster

ISBN-10: 3658075961

ISBN-13: 9783658075965

ISBN-10: 365807597X

ISBN-13: 9783658075972

Numerical courses usually use parallel programming innovations corresponding to OpenMP to compute the program's output values as effective as attainable. moreover, spinoff values of those output values with recognize to definite enter values play a vital position. to accomplish code that computes not just the output values concurrently but additionally the by-product values, this paintings introduces numerous source-to-source transformation principles. those principles are in line with a method referred to as algorithmic differentiation. the main target of this paintings lies at the vital opposite mode of algorithmic differentiation. The inherent data-flow reversal of the opposite mode has to be dealt with thoroughly throughout the transformation. the 1st a part of the paintings examines the ameliorations in a truly normal means due to the fact pragma-based parallel areas ensue in lots of other forms resembling OpenMP, OpenACC, and Intel Phi. the second one half describes the transformation ideas of an important OpenMP constructs.

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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.

Loop Construct, p. 57 "The parallel sections construct is a shortcut for specifying a parallel construct containing one sections construct and no other statements. The syntax of the parallel sections construct is as follows: #pragma omp p a r a l l e l s e c t i o n s [clause[[,] clause] [. " Example 9. The following code is the combined version of Example 7. 1 43 10 f o r ( i n t i ← 0 ; i

The atomic construct with the update clause forces an atomic update of the location designated by x using the designated operator or intrinsic. Note that when no clause is present, the semantics are equivalent to atomic update. Only the read and write of the location designated by x are performed mutually atomically. The evaluation of expr or expr_list need not be atomic with respect to the read or write of the location designated by x. " We only consider the atomic construct with no additional clauses.

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


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