build-and-run

Build And Run

Build

Previous examples used only bueno's none image activator. This example, however, explores using bueno's charliecloud image activator. We will start by building a container image using Charliecloud for nbody, our example MPI application.

ch-build2dir --force -t nbody-img -f ./Dockerfile.mpich . .

Once completed, there will be a new directory named nbody-img in your working directory. We will use the contents of this directory when executing the bueno run script.

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Run

Instead of simply instructing bueno to execute our run script as we have in the past, we will provide bueno with a container image to work with.

bueno run --do-not-stage -i nbody-img -p build-and-run.py

If successful, the terminal will fill with output from the containerized application. If you encountered some errors, try the workarounds outlined in the following tip:

Tip: If you encountered an error similar to this:

What: run error encountered.
Why:  Cannot determine the number of nodes in your job.

or this:

ch-run[251876]: join: no valid peer group size found (ch-run.c:382)

Try the following:

export SLURM_CPUS_ON_NODE=2 # Or another number to match system resources.