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topologies to reduce latency, improve bandwidth, and improve scalability. Directives A popular X category is the directive [2], which includes OpenMP and OpenACC, both of which were formed to standardize ... OpenACC is a great tool for parallelizing applications for a variety of processors. In this article, I look at one of the most powerful directives, parallel loop. ... OpenACC

considered "non-portable." One promising solution is the use of OpenACC comment directives [4] in existing Fortran and C/C++ code. The code still remains portable and can be compiled to run on a standard CPU

importantly, the concept of directives is growing rapidly. An initiative called OpenACC [5] is developing a set of directives that tell compilers how to create code that runs on an accelerator. The most common

applications. For example, someone might code with OpenACC [4] to target GPUs and Fortran for PGI compilers, along with Open MPI, whereas another person might use GNU Compiler Collection (GCC) 8.1 with MPICH

-core processors. Efficiently implementing these OpenMP concepts (or alternative models such as OpenACC) in the selected compiler suite is necessary for successful optimization. With the high complexity

directives is that if the compiler is not HPF-aware, it views the directives as comments and just moves on. This is the same approach taken by OpenACC [12] and OpenMP [13]. The HPF extensions never seemed

serial, OpenMP, OpenACC, and MPI code. I carefully watch the load on each core with GkrellM [3], and I can see the scheduler move processes from one core to another. Even when I leave one to two cores free