**Combination use of OpenMP + MPI * -n = Number of MPI Tasks / Processeis * PTILE = Number of tasks * OMP_NUM_THREADS = Number of threads * -n / ptile = Number of nodes * -n * OMP_NUM_THREADS = CPU_Cores / Threads / Slots #BSUB -n 2 #BSUB -R "span[ptile=2]" export OMP_NUM_THREADS=12 JOBID USER STAT QUEUE FROM_HOST EXEC_HOST JOB_NAME SUBMIT_TIME 11461 cv7457 RUN standard cirrustest- 2*compute HELLO Jun 14 14:12 LSB_SUB_JOB_NAME="HELLO" LSB_SUB_QUEUE="standard" LSB_SUB_OUT_FILE="%J.o" LSB_SUB_ERR_FILE="%J.e" LSB_SUB_EXCLUSIVE=Y LSB_SUB_USER_GROUP="ebp" LSB_SUB_RES_REQ=" span[ptile=2] affinity[core(12)]" LSB_SUB3_APP="custom" LSB_SUB_HOSTS="compute" LSB_SUB_RLIMIT_RUN=3600 LSB_SUB_NUM_PROCESSORS=2 LSB_SUB_MAX_NUM_PROCESSORS=2 LSB_SUB_NUM_TASKS=2 LSB_SUB_MAX_NUM_TASKS=2 Tue Jun 14 14:12:38: Started 2 Task(s) on Host(s) <2*n1>, Allocated 24 Slot(s) on Host(s) <24*n1>, Execution Home , Exe cution CWD ;