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octave dev slow down


From: Dmitri A. Sergatskov
Subject: octave dev slow down
Date: Mon, 22 May 2017 23:48:10 -0500

I run some benchmarks with the recent dev vs 4.2.1 and noticed a significant slowdown
for the following test:

a=randn(4000);
tic; a'*a; toc
For both runs I LD_PRELOAD=/usr/lib64/atlas/libtatlas.so
and then repeat with LD_PRELOAD=/usr/lib64/atlas/libsatlas.so
4.2.1:

Elapsed time is 1.61557 seconds. (t)
Elapsed time is 5.02009 seconds. (s)

hg id
ed2239ed5fd3 tip @

Elapsed time is 2.78834 seconds. (t)
Elapsed time is 9.69433 seconds. (s)

Most of other benchmarks (like inv(a)*a, a\b are pretty much the same).

Dmitri.
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