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Examples to demonstrate use of OpenMP in c and C++

The LLVM compiler supports several accelerated programming models for GPUs. OpenMP is one of these models. Examples in this directory demonstrate how to compile and execute c and C++ applications that use OpenMP target offload.

If examples are in a read-only directory, the Makefile can be run from a writeable directory as follows:

mkdir /tmp/demo ; cd /tmp/demo
EXROOT=/opt/rocm/share/openmp-extras/examples  # The examples base directory.
make -f $EXROOT/openmp/reduction/Makefile run

To execute an example directly, recursively copy the entire examples directory to a writeable directory. For example:

EXROOT=/opt/rocm/share/openmp-extras/examples # The examples base directory.
cp -rp $EXROOT /tmp/                          # Recursively copy examples to /tmp/examples
cd /tmp/examples/openmp/reduction             # cd to writeable example directory
make run                                      # Compile and execute the reduction example

There are many other make targets to show different ways to build the binary. Run make help to see all the possible demos as Makefile targets.

E.g. to run with some debug output set OFFLOAD_DEBUG variable:

env OFFLOAD_DEBUG=1 make
env OFFLOAD_DEBUG=1 make run

These are the c and C++ examples in the openmp examples category: