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[Octave-bug-tracker] [bug #46830] Multiplication about 4x slower than Ma

From: Philip Nienhuis
Subject: [Octave-bug-tracker] [bug #46830] Multiplication about 4x slower than Matlab
Date: Thu, 8 Sep 2022 15:33:54 -0400 (EDT)

Follow-up Comment #25, bug #46830 (project octave):

W.r.t. my comment #13
> On that _(Ryzen 5800U)_ laptop the same code runs much slower (...).

I usually copy the complete crossbuilt tree over to a btrfs partition that I
can then access directly in Windows using winbtrfs.
However copying libopenblas.dll to libblas.dll wasn't implemented in that
scenario yet ... I'll adapt my local <mxe-octave>/binary-dist-rules.mk to also
fix this.

With that fixed "installation" I get a performance that is about 10 % faster
than what I wrote in comment #9.
Intriguingly, increasing the number in environment setting
"OpenBLAS_NUM_THREADS" beyond 8 makes no difference (Ryzen 5800U has 8 cores /
16 threads). Only thing I see with higher numbers is that initially CPU
utilization peaks shortly at 70 to 80 % but immediately goes down to ~63 % for
the rest of the computation time; which is the same CPU utilization as when
using 8 threads.
FTR OpenBLAS is at 3.20 in mxe-octave.


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