Building the examples

We'll manually be compiling all examples with GCC in the terminal. To compile you should run the command:

g++ [-fopenmp] [-O2] <sources.cpp>

with optional -fopenmp or -O2 flags to enable openmp and compiler optimisations respectively. You should replace <sources.cpp> with main.cpp timer.cpp in examples that use the provided timer code, or usually main.cpp otherwise.

Running the examples

Each example can be run with:

./a.out

To change the number of threads OpenMP uses, we set the environment variable before running the executable:

OMP_NUM_THREADS=<N> ./a.out

Change <N> to the number of threads you desire, for example:

OMP_NUM_THREADS=8 ./a.out

In later examples you will want to set the schedule used in OpenMP loops that use the runtime schedule. You can set this at the same time as setting the number of threads with:

OMP_NUM_THREADS=N OMP_SCHEDULE=<value> ./a.out

Replace <schedule> to the desired value.