====== Gromacs on Mills ======

Templates for Grid Engine queue submission scripts are available for batch GROMACS jobs in ''/opt/shared/templates/gridengine/gromacs''.  Copy and edit the template based on your job by following the usage described in ''gromacs.qs''.

<note tip>It is a good idea to periodically check in ''/opt/shared/templates/gridengine/gromacs'' on a specific cluster for changes in existing templates, or the addition of new templates, designed to provide the best performance for a particular version of GROMACS on that cluster.</note>

===== Batch job =====

On Mills, the template (''/opt/shared/templates/gridengine/gromacs.qs'' specifies a number of resource options to provide the best performance.  The number of slots specified for ''NPROC'' should be a multiple of 24 in conjunction with specifying [[abstract:mills:runjobs:queues#mills-exclusive-access|exclusive access]] to allow your job to run on the node(s) required based on the number of slots requested without any other jobs running on those node(s) too. Also specifying ''vpkg_require gromacs/4.5.5-intel64'' (single-precision intel) or ''vpkg_require gromacs/4.5.5-open64'' (double-precision open64) has provided the best results.  By default the template uses double-precision (''md_rund''), however uncommenting ''USE_SINGLE_PRECISION=YES'' will specify the single-precision version (''md_run'') instead. Again for best performance, binding cores and only using half of the slots per node are defined as the default due to the shared FP (Floating-Point) unit on Mills.