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Update qchem.md #686

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Update qchem.md #686

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Update slurm script and add BrianQC contents.

Update slurm script and add BrianQC contents.
docs/Documentation/Applications/qchem.md Outdated Show resolved Hide resolved
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A large number of example Q-Chem input examples are available in `/nopt/nrel/apps/q-chem/<version>/samples`.

## Running BrianQC
BrianQC is the GPU version of Q-Chem and can perform Q-Chem calculations on GPUs, which is significantly faster for some larger ab initio jobs. BrianQC uses the same input file as Q-Chem. To run BrianQC, please make the following changes to the sample Slurm scipt above:
1. Add this line in the header section: "#SBATCH --gres=gpu:1"
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If only using 1 GPU, would you recommend removing --exclusive and changing the number of cores, so that the job isn't charged for the full node and 3 GPUs aren't idle? For GPU jobs, RAM also needs to be requested.

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