n1:~/USB/debug/datarace > make
        gfortran -fopenmp -c loopy.F90
        gfortran -fopenmp -o f loopy.o 
        fortran executable ready




n1:~/USB/debug/datarace > echo $OMP_NUM_THREADS 
1
n1:~/USB/debug/datarace > ./f
 threadid= 0/ 1
 sum1=         -28
           1          -4          -9         -16
 sum2=         -12
           1          -1          -4          -8




n1:~/USB/debug/datarace > export OMP_NUM_THREADS=3
n1:~/USB/debug/datarace > ./f
 threadid= 1/ 3
 threadid= 0/ 3
 threadid= 2/ 3
 sum1=         -28
           1          -4          -9         -16
 sum2=          -2
           1          -1          -1          -1
