[Octave-bug-tracker] [bug #62358] Performance of Matrix Multiplication significantly slower in 7.1.0 compared to 6.1.0

[Arun Giridhar]

Follow-up Comment #5, bug #62358 (project octave):

Octave 6.1.0 is nearly as fast as 5.2.0:

octave:3> bench_mmult
N = 1000
Method 2: MEAN GFLOPS single: 463.67590
Method 2: MAX GFLOPS single: 466.03481


Octave 6.4.0 is a little bit slower still:

octave:4> bench_mmult
N = 1000
Method 2: MEAN GFLOPS single: 460.57625
Method 2: MAX GFLOPS single: 461.59664
octave:5> bench_mmult
N = 1000
Method 2: MEAN GFLOPS single: 460.65557
Method 2: MAX GFLOPS single: 461.59766


There might not be just one change that causes the drop from 5.2.0 to 7.1.0
but it might have accumulated over time, which makes it more difficult to
localize. But the bigger part of the drop seems to be between 6.4.0 and 7.1.0.
This means I was likely mistaken in comment #1. Bisecting there next.


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