OpenACC: Difference between revisions

OpenACC (view source)

583 bytes removed , 3 years ago

Removed incomplete but still duplicated information

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 = OpenACC compiler instructions =
-Similar to [[OpenMP]], OpenACC can convert a for-loop into parallel code that would run on an accelerator. This can be achieved with compiler instructions <code>#pragma acc ...</code> before a for-loop.
+Similar to [[OpenMP]], OpenACC can convert a for-loop into parallel code that would run on an accelerator. This can be achieved with compiler instructions <code>#pragma acc ...</code> before a for-loop. All <code>pragma</code> directives are described in the [https://www.openacc.org/specification OpenACC specification].
-== <code>pragma acc parallel</code> ==
-This will start the following structured block of code in parallel execution on the accelerator.
-Optional clauses:
-* <code>vector_length(size)</code>: determines the vector length to use for vector or SIMD operations.
-** For example, <code>size</code> can be: 256, 512
-== <code>pragma acc loop</code> ==
-The following for-loop will be converted for an execution on the accelerator.
-Optional clauses:
-* <code>reduction(op:variable)</code>: the loop is doing a reduction in a variable defined outside of the loop. For each thread in parallel, a private version of that variable will be used.
-** Typical operators: <code>+</code> (sum), <code>*</code> (product)
 = Code examples =