Eigs passes with openblas if I set OPENBLAS_NUM_THREADS to 8 (the number of actual cores) or less. The simple benchamark “a=randn(4000); tic; inv(a)*a; toc” also runs faster than
with default (I assume 16 threads). Perhaps we should change it in the install somehow.
test subplot fails invariably.
p.s. I just checked that with 4 threads the timing is longer by ~5% (1.8sec vs 1.7 for 8 threads and it is 2.1 for the default (16?) threads). So underestimating num of threads looks better to me than overestimating.