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# PBS Tricks
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## Multiple mpirun's in one pbs job
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For an example of multiple mpirun's in a single PBS job see: [VASP example](https://code.ornl.gov/CNMS/CNMS_Computing_Resources/blob/master/CADES/VASP/VASP_OneJob_Parallel_Runs)
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## Chaining pbs jobs
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This is actually a pretty good primer on job chaining techniques.
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https://www.nics.tennessee.edu/computing-resources/running-jobs/job-chaining
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If you combine the above two you can run many long trajectories or relaxations via backfilling without fragmenting the hpc environment and making highly parallel jobs difficult to launch. |
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