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| From: | Dmitri A. Sergatskov |
| Subject: | [Octave-bug-tracker] [bug #57110] `version -blas` reports "unknown or reference BLAS" |
| Date: | Wed, 23 Oct 2019 19:57:48 -0400 (EDT) |
| User-agent: | Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0 |
Follow-up Comment #1, bug #57110 (project octave):
perhaps the following is related (dev version on Fedora):
$ LD_PRELOAD=/usr/lib64/libopenblas.so octave -q -f
octave:1> version -blas
ans = OpenBLAS (config: OpenBLAS 0.3.7 DYNAMIC_ARCH NO_AFFINITY Sandybridge
SINGLE_THREADED)
octave:2> a=randn(3000);
octave:3> tic; inv(a)*a; toc
Elapsed time is 4.74749 seconds.
octave:4>
$ LD_PRELOAD=/usr/lib64/libopenblasp.so octave -q -f
octave:1> version -blas
ans = OpenBLAS (config: OpenBLAS 0.3.7 DYNAMIC_ARCH NO_AFFINITY Sandybridge
MAX_THREADS=128)
octave:2> a=randn(3000);
octave:3> tic; inv(a)*a; toc
Elapsed time is 2.03826 seconds.
octave:4>
$ LD_PRELOAD=/usr/lib64/libblas.so.3 octave -q -f
octave:1> version -blas
ans = OpenBLAS (config: OpenBLAS 0.3.7 DYNAMIC_ARCH NO_AFFINITY Sandybridge
SINGLE_THREADED)
octave:2> a=randn(3000);
octave:3> tic; inv(a)*a; toc
Elapsed time is 37.4247 seconds.
octave:4>
it misidentifies reference blas as openblas.
Dmitri.
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