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<code>kernels</code> directive is the more general case and probably one that you might think of, if you've written GPU (e.g. CUDA) kernels before. <code>kernels</code> simply directs the compiler to work on a piece of code, and produce an arbitrary number of "kernels", of arbitrary "dimensions", to be executed in sequence, to parallelize/offload a particular section of code to the accelerator. The <code>parallel</code> construct allows finer-grained control of how the compiler will attempt to structure work on the accelerator, for example by specifying specific dimensions of parallelization. For example, the number of workers and gangs would normally be constant as part of the <code>parallel</code> directive (since only one underlying "kernel" is usually implied), but perhaps not on the <code>kernels</code> directive (since it may translate to multiple underlying "kernels"). A good treatment of this specific question is contained in <a href="http://www.pgroup.com/lit/articles/insider/v4n2a1.htm" rel="nofollow noreferrer">this PGI article</a>. Quoting from the article summary: "The OpenACC kernels and parallel constructs each try to solve the same problem, identifying loop parallelism and mapping it to the machine parallelism. The kernels construct is more implicit, giving the compiler more freedom to find and map parallelism according to the requirements of the target accelerator. The parallel construct is more explicit, and requires more analysis by the programmer to determine when it is legal and appropriate. "
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singulars
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1. PODifference between kernels construct and parallel construct
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1. USRobert Crovella
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1. USRobert Crovella
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1. COThanks a lot for your answer!!! Now is clear for me the difference! :)
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 USpg1927

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