dgemm   n= 4000      73.259 s      1.75 GFLOP/s  (check c[0]=6.004976)
dpotrf  n= 4000       5.121 s      4.17 GFLOP/s  (info=0, L00=63.245553)
dgetrf  n= 4000      10.225 s      4.17 GFLOP/s  (info=0)
EXIT: 0