simple-gpu

Simple GPU usage

In this exercise you can have a first taste about using GPUs.

1. Use the provided batch job script job_gpu.sh for running the rocm-smi command in GPU node. Investigate output.

   Submit the batch job again, but request now more GPUs, i.e. increase the value in --gpus-per-node Slurm option. How does the output look now?

   Hint: rocm-smi can be useful also with real applications. While a GPU job is running, one can start a shell in compute node, and by issuing the rocm-smi command there one can get first hint how the application is utilizing GPUs.

2. Try to build and run a simple "GPU hello world" program. In order to build application for GPUs, a proper modules need to be loaded:

   module load PrgEnv-cray
   module load rocm
   module load craype-accel-amd-gfx90a
   

   Once the modules are loaded, build the code with the provided Makefile. Finally, run the program hello_gpu in a GPU node, try to request different number of GPUs.