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Programmers use a number of compilers, libraries, MPI libraries/tools, and other tools to write applications. For example, someone might code with OpenACC, targeting GPUs and Fortran, whereas another person

is often considered “non-portable.” One promising solution to this problem is the use of OpenACC comment directives in existing Fortran and C/C++ code. Code still remains portable and can be compiled to run ... HPC, parallel processing, GPU, multicore, OpenMP, MPI, many core, OpenACC, CUDA, MICs, GP-GPU

cores nowadays. Perhaps more importantly, the concept of directives is growing rapidly. For example, an initiative called OpenACC is developing a set of directives that tell compilers how to create code

-GPU requires re-writing code to use the GPU cores. Some new methods (OpenACC) could help with this issue, but the traditional MPI model is being stressed by the new hardware. Similar to the early days of Beowulf