To take advantage of Rockstar parallelisation features on the shared-memory queues cosma7-shm and cosma8-shm (or on a single cosma7/cosma8
node) in your SBATCH script set —ntasks=1 and —cpus-per-task=<# of processes=NUM_BLOCKS+NUM_WRITERS>. The maximum number of CPUs that can be
allocated depends on the specific queue used for your job (e.g. —cpus-per-task<=28 for cosma7). In your Rockstar configuration file set
NUM_BLOCKS and NUM_WRITERS=FORK_PROCESSORS_PER_MACHINE to the desired values and run

./rockstar -c </path/to/configuration file> &

sleep 1


./rockstar -c [OUTBASE]/auto-rockstar.cfg &

If running on a single node, you may also wish to set PARALLEL_IO_SERVER_INTERFACE = lo
The PARALLEL_IO variable must be set to 1.