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Not certain about Nvidia but I put it anyway because they are the ones I got this from on my twitter
Programming GPU accelerators involves 3 basic aspects: splitting the source code between host and GPU, managing data allocation and movement between host memory and GPU memory, and optimizing GPU kernels. Much of this process can be automated using modern compiler technology and high level programming techniques. In this webinar, Mat Colgrove, Applications Engineer for The Portland Group, will present a case study on using PGI Accelerator compiler directives to achieve a 5x speed-up in approximately 5 hours of programming time on this popular geophysics code.

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