When a job fails on an HPC cluster, your first instinct might be to rerun it and hope for a different outcome. That rarely works. The real answers are almost always sitting quietly in your job logs.

Understanding how to read those logs effectively can save hours of guesswork and help you fix issues faster and more confidently.

Start With the Basics: Exit Codes

Every job finishes with an exit code. This is the simplest signal of what happened.

0 means success

Non-zero values indicate failure

In Slurm, you will often see something like:

ExitCode=1:0

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The first number is the job’s exit status, and the second is the signal.…