#! /bin/sh
#
#SBATCH -N4 -n4 --partition=fast

# mpirun number of nodes
#
H="-n 4"

# man awk:
# rand() Return a random number N, between 0 and 1, such that 0 <= N < 1.
# srand([expr]) Use expr as the new seed for the random number generator.
# If no expr is provided, use the time of day.
#
seed=$(awk 'BEGIN { srand(); print int(rand()*lshift(1,31)); }' < /dev/null)

# mpirun --bind-to none
# default binding is to socket, which limits #cores used = #sockets
# check using e.g. mpstat -P ALL 5 5 and see also --report-bindings

date

for NX in 27 28 29 30 31 32 33
do
  for T in 1 2 4 8 16 32
  do
    echo "nx = $NX, t = $T"
    mpirun_args="$H --bind-to none -x OMP_NUM_THREADS=$T" 
    cmd="mpirun $mpirun_args ./BV-omp -s$seed -r -c11 $NX"
    echo "$cmd"
    eval time -p "$cmd"
  done
done

date