Source repo: sdsc-summer-institute-2025 | Branch: main | Last synced: 2026-04-24 10:27:17.425 UTC

Credit

Mark Harris - NVIDIA Corporation Andreas Goetz - SDSC: OMP code and minor modifications

Description

A simple Jacobi iteration useful for teaching both the kerenels (or parallel) and data directives. There is some high-level timing code built-in to the program, but you may wish to also make use of a profiler when using this example.

Files

Miscellaneous: timer.h - simple timing code

Exercise: jacobi.c - The serial C code lacking any OpenACC constructs
jacobi.f90 - The serial Fortran code lacking any OpenACC constructs

jacobi-omp.c - OpenMP parallel C code
jacobi-omp.f90 - OpenMP parallel Fortran code

Solution: jacobi-acc.c - A simple OpenACC C ccelerated version of the code. jacobi-acc.f90 - A simple OpenACC Fortran accelerated version of the code.

Compile: Using the PGI compiler

CPU serial version

pgcc -fast -o jacobi-pgcc.x jacobi.c pgf90 -fast -o jacobi-pgf90.x jacobi.f90

CPU OpenMP parallel version

pgcc -fast -mp -Minfo=mp -o jacobi-pgcc-omp.x jacobi-omp.c pgf90 -fast -mp -Minfo=mp -o jacobi-pgf90-omp.x jacobi-omp.f90

GPU OpenACC version

pgcc -acc -Minfo=accel -o jacobi-pgcc-acc.x jacobi-acc.c pgf90 -acc -Minfo=accel -o jacobi-pgf90-acc.x jacobi-acc.f90