Open Traffic Models - MPI communication: This a parallized version of the OTM simulation engine that uses Message Passing Interface (MPI) for multi-core communication on high performance computing (HPC) systems. It can exploit parallel computation and HPC power to significantly speed up large-scale traffic simulations.

• Download open-mpi 3.1.
• Install Metis. Two methods:
  • metis-5.1.0.tar.gz. Follow the instructions in Install.txt. To build METIS you will need to have cmake.
  • Ubuntu: sudo apt install metis

git clone [email protected]:ggomes/otm-sim.git
cp otm-sim/settings.xml ~/.m2
cd otm-sim
git checkout remotes/origin/ctmrefac
mvn clean install -DskipTests

Alternatively you can download the otm-sim jar here

• IntelliJ > Import project > otm-mpi > create project from existing sources ...
• Add otm-sim and json jar files

Files > Project Structure > Project Settings > Modules
	> Dependencies > + JARs or directories
 		> otm-sim/target/otm-sim-1.0-SNAPSHOT-jar-with-dependencies.jar
   			check "Export" for otm-sim   
		> otm-mpi/lib/json-simple-1.1.1.jar
	> Sources > Add Content Root
		> openmpi-3.1.0/ompi/mpi/java
			Edit Root Properties > Package prefix : mpi

• Run test.tests.XMLSplitterTest.main()

export OTMSIMJAR=<path to otm-sim jar>
export OTMMPIHOME=<path to otm-mpi folder>
chmod u+x $OTMMPIHOME/scripts/*.sh

• ./run_splitter.sh : Test offline scenario splitting with a small network.
• ./compile_mpi.sh : Compile the program using mpijavac.
• ./compare_veh.sh : Run small example with 2 processes, and compare result to single-process run.
• ./run_mpi.sh : Run small example with 4 processes.