BLAS

• Caffe Issue: In CPU mode, using multi-core is much slower than using a single core #1539

OpenBLAS

• https://github.com/xianyi/OpenBLAS/wiki/faq
• Threaded OpenBlas benchmark slower than system blas?

single-threaded version

export OPENBLAS_NUM_THREADS=1

make USE_THREAD=0
# or
make USE_OPENMP=1