From the NWChem home page: NWChem is a computational chemistry package that is designed to run on high-performance parallel supercomputers as well as conventional workstation clusters. It aims to be scalable both in its ability to treat large problems efficiently, and in its usage of available parallel computing resources. NWChem has been developed by the Molecular Sciences Software group of the Environmental Molecular Sciences Laboratory (EMSL) at the Pacific Northwest National Laboratory (PNNL). Most of the implementation has been funded by the EMSL Construction Project.
NWChem requires the following module file to run:
- See Modules for more information.
Running NWChem on CIRCE/SC
The NWChem user guide is essential to understanding the application and making the most of it. The guide and this page should help you to get started with your simulations. Please refer to the Documentation section for a link to the guide.
- Note on CIRCE: Make sure to run your jobs from your $WORK directory!
- Note: Scripts are provided as examples only. Your SLURM executables, tools, and options may vary from the example below. For help on submitting jobs to the queue, see our SLURM User’s Guide.
Submitting a Job
Each user will probably need a .nwchemrc file to point to the default data files. A global one is located in /apps/nwchem/6.8/data and a symbolic link can be made in your $HOME directory. Users should issue the following command prior to using NWChem:
ln -s /apps/nwchem/6.8/default.nwchemrc $HOME/.nwchemrc
- The script below (for testing, name it “nwchem-test.sh”) can be copied into your job directory (the folder with your input files) and modified so that you can submit batch processes to the queue.
#!/bin/bash # #SBATCH --comment=nwchem-test #SBATCH --ntasks=8 #SBATCH --job-name=nwchem-test #SBATCH --export=ARMCI_DEFAULT_SHMMAX=8192 #SBATCH --output=output.%j.nwchem-test #SBATCH --time=01:00:00 #### SLURM 8 processor NWChem test to run for 1 hour. ulimit -l unlimited module purge module load apps/nwchem/6.8 mpirun nwchem input_file.nw
Next, you can change to your job’s directory, and run the sbatch command to submit the job:
[user@login0 ~]$ cd my/jobdir [user@login0 jobdir]$ sbatch ./nwchem-test.sh
- You can view the status of your job with the “squeue -u <username>” command
Home Page, User Guides, and Manuals
- NWChem Home Page
- NWChem Documentation
Benchmarks, Known Tests, Examples, Tutorials, and Other Resources
- NWChem Examples
- NWChem Benchmarks
More Job Information
See the following for more detailed job submission information:
Report bugs with NWChem to the IT Help Desk: email@example.com