What is OpenACC?

OpenACC is a user-driven directive-based performance-portable parallel programming model designed for scientists and engineers interested in porting their codes to a wide-variety of heterogeneous HPC hardware platforms and architectures with significantly less programming effort than required with a low-level model.

#pragma acc data copy(A) create(Anew)
while ( error > tol  &&  iter  <  iter_max )  {
  error = 0.0;
#pragma acc kernels {
#pragma acc loop independent collapse(2)
  for (  int  j = 1; j < n-1;  j++ )  {
    for (  int  i = 1; i < m-1; i++ )  {
       Anew [j] [i] = 0.25 * ( A [j] [i+1] + A [j] [i-1] +
                                      A [j-1] [i] + A [j+1] [i]);
       error = max ( error, fabs (Anew [j] [i] - A [j] [i]));
      }
    }
  } 
}

Resources Access tutorials, guides, lectures, code samples, hands-on exercises and more. Get the Specs Download the latest OpenACC specification, technical report and work-in-progress proposals. Tools Get OpenACC compilers and tools designed by multiple vendors and academic organizations. Success Stories Learn how OpenACC users accelerated their scientific applications.

Latest News

HPCWire: Jack Wells Joins OpenACC; Arm Support Coming

Jun. 17, 2019

InsideHPC: Jack Wells from ORNL on his new role as VP of OpenACC.org

Jun. 16, 2019

OpenACC Empowers User Community

Jun. 16, 2019

GPU Hackathon Series Kicks Off with Five Days in South Korea

May. 2, 2019

PGI 19.4 Now Available for Free Download!

Apr. 30, 2019

Upcoming Events

Princeton GPU Hackathon
June 24, 2019
Princeton, NJ, USA
Brazil GPU Hackathon
July 8, 2019
Petrópolis, Brazil
NERSC GPU Hackathon
July 22, 2019
Berkeley, CA, USA
Sheffield GPU Hackathon
August 19, 2019
Sheffield, UK

Join Us

Tweets by OpenACCorg