Does LAPACK/BLAS automatically use multi cores or threads?

18

Thanks @RonShepard .
In the kxk code, changed the

n=1000

to

n=5000

Since it seems n=1000 is too small to give accurate results on my laptop.

For n=5000, with Intel OneAPI, below is what I got,

c11=   2.90899748439952      cpu_time=   8.60937500000000       GFLOPS=
   29.0381125226860
 c11=   2.90899748439952      cpu_time=   5.17187500000000       GFLOPS=
   48.3383685800604