Hi Jiaqi, Unfortunately this is default openblas configuration, and it is outside of our control, as far as I know.
Best, Anton On Fri, 22 May 2020 at 14:18, Zhou Jiaqi <jiaqi.z...@uclouvain.be> wrote: > > Dear Anton, > > Thank you very much for your timely reply. I find that OPENBLAS_NUM_THREADS=1 > is quite effective, it can enforce the calculation to be in 1 thread and > improve the efficiency by 3 times. Thanks for advice ! > > Still there remains a problem : When I use a normal instruction, i.e. ‘python > kwant.py’ to run, it starts many threads and results in low speed. However, > when I use ‘OPENBLAS_NUM_THREADS=1 python kwant.py’, it starts only 1 thread > and results in high speed. I am quite confused about why the normal > instruction involves many threads, as well as presents an unsatisfactory > performance. > > The procedure I installed Kwant : > sudo apt-get install libmumps-scotch-dev # for MUMPS > python setup.py build > python setup.py install > > Thanks again for your help ! > > Sincerely, > Jiaqi
