Category: OpenACC
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Understanding Fortran Array Indexing in OpenACC
What You’ll Learn Today Fortran counts differently than some other programming languages, and this matters A LOT when working with OpenACC! It’s like the difference between floor numbers in American buildings (1st floor, 2nd floor) versus British buildings (ground floor, 1st floor). The Big Difference: Starting from 1 Fortran Way (starts from 1): C/Python Way…
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Your First OpenACC Fortran Program – Parallel Loop on GPU
What You’ll Learn Today Today you’ll write your very first OpenACC program that actually runs on the GPU! Think of it like learning to ride a bicycle – once you understand the basic structure, everything else becomes easier. The Magic of Parallel Loops Imagine you’re a teacher with 100 math problems to grade. You could:…
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Introduction to OpenACC with Fortran
What You’ll Learn Today Imagine you have a huge pile of homework to do. You could do it all by yourself, or you could ask your friends to help. That’s exactly what OpenACC does for your computer programs – it gets help from the GPU (Graphics Processing Unit) to make calculations super fast! What is…
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Profiling OpenACC Code using NVPROF
Profiling your OpenACC code on a remote system can be tricky sometimes. Many times we try to profile the code in cluster environment where we need to use a job scheduler to submit our jobs. In such scenarios, command line based profiling comes handy. This tutorials provides some usage examples for NVIDIA’s command line profiler…
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Compiling and Running OpenACC Fortran Codes using PGI Fortran
In this tutorial we will learn how to compile and execute an OpenACC Fortran code using PGI Fortran Compiler. Let’s look at the sample vector addition code parallelized using OpenACC Fortran based parallel loop construct. We can compile this code for Nvidia GPU using following command – Or Here, ‘-ta=tesla’ option informs compiler that compiler…