How to use multi CPU cores to train NNs using caffe and OpenBLAS

Question

I am learning deep learning recently and my friend recommended me caffe. After install it with OpenBLAS, I followed the tutorial, MNIST task in the doc. But later I found it was

Answer 1

While building OpenBLAS, you have to set the flag USE_OPENMP = 1 to enable OpenMP support. Next set Caffe to use OpenBLAS in the Makefile.config, please export the number of threads you want to use during runtime by setting up OMP_NUM_THREADS=n where n is the number of threads you want.