building-running

Makefiles, modules, and batch job system

Building and running CPU code

1. Build the code in cpu with make. In LUMI the correct compiler command is CC, modify Makefile as needed.
2. "Modify" one of the source files by touch util.cpp, run make again and observe the behaviour
3. Try to run the resulting executable prog via batch system. A template batch job scripts are provided in ../. Try different number of nodes and tasks per node.
4. For simple testing, it is sometimes convenient to launch the program directly from command line with srun

srun --account=<my_account> --nodes=<nodes> --ntasks-per-node=<tasks-per-node> --partition=<partition> ./prog

Try to run the program also this way.

Building and running GPU code

1. Build the code in gpu with make. Modify Makefile as needed. Note: You need to load proper GPU modules.
2. Try to run the resulting executable prog via batch system. A template batch job scripts are provided in ../. Try different number of nodes and gpus per node.
3. Try to run the program also directly from command line with srun