[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 #9, bug #62358 (project octave):

Found it: https://hg.savannah.gnu.org/hgweb/octave/rev/298995435071 
It's the one that adds custom memory allocators to Array.

Bisection trail:

$ hg bisect -g 8d7671609955    ## 6.4.0 known fast: 469 GFLOPS
$ hg bisect -b 04120d65778a    ## 7.1.0 known slow: 444 GFLOPS

Testing changeset 30510:84344af9b019 (320 changesets remaining, ~8 tests)
## 444 GFLOPS
$ hg bisect -b

Testing changeset 30370:dbff48b54dd2 (160 changesets remaining, ~7 tests)
## 467 GFLOPS
$ hg bisect -g

Testing changeset 30438:ad705550616c (80 changesets remaining, ~6 tests)
## 468 GFLOPS
$ hg bisect -g

Testing changeset 30473:b33ae3c094ac (40 changesets remaining, ~5 tests)
## 470 GFLOPS
$ hg bisect -g

Testing changeset 30492:e9a6d3822244 (20 changesets remaining, ~4 tests)
## 444 GFLOPS
$ hg bisect -b

Testing changeset 30486:298995435071 (10 changesets remaining, ~3 tests)
## 446 GFLOPS
$ hg bisect -b

Testing changeset 30480:83dbee7c8f08 (5 changesets remaining, ~2 tests)
## 468 GFLOPS
$ hg bisect -g

Testing changeset 30482:ddd58087ca97 (3 changesets remaining, ~1 tests)
## 468 GFLOPS
$ hg bisect -g

Testing changeset 30484:02b11b9f1e61 (2 changesets remaining, ~1 tests)
## 468 GFLOPS
$ hg bisect -g

The first bad revision is:
changeset:   30486:298995435071
branch:      stable
parent:      30484:02b11b9f1e61
user:        John W. Eaton <jwe@octave.org>
date:        Sat Dec 04 08:49:18 2021 -0500
summary:     allow custom allocators for the Array class




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