Re: octave dev slow down

[Julien Bect]

Le 12/07/2017 à 11:35, jbect a écrit :

Michael Godfrey wrote

Just a note: I did some cleanup on the code sections that I have been 
timing:
Old code:
4.3.0+
test 2: cputime used: 9.2e-01 seconds

4.0.3   /usr/bin/octave --no-gui
test 2: cputime used: 6.4e-01 seconds

New code:
4.3.0+
test 2: cputime used: 5.1395e-01 seconds

4.0.3
test 2: cputime used: 3.4943e-01 seconds

Moral of this is that it pays to spend time on code cleanup.
This more than offset the 4.3.0+ slowdown.
Of course, 4.3.0+ is still slower by about the same amount.

Michael

Hi everyone,

I also notice a similar a slow-down when benchmarking the stk_predict
function in the stk package.

Here are the median times in ms (the first two digits should be significant,
sorry about the others):




About the column names:
 * Oct403 is the 4.0.3 release from Debian repos
 * Oct421 is compiled from source from the tip of stable
 * Oct430 is compiled from source from the tip of default
 * (the first column... well, you can probably guess)

About the row names: correspond to various configurations for the size of
the input arguments.

Basically: when these numbers are large, we essentially benchmarking linear
algebra operations (I think).

The results can be reproduced as follows

hg clone -r 2.5.x http://hg.code.sf.net/p/kriging/hg stk-test
cd stk-test
octave &

stk_init
pkg load statistics
cd misc/benchmarks
stk_benchmark_predict

@++
Julien

This is weird, the table disappeared from my first email.  Here it is:

|             :  med_R2016  med_Oct403  med_Oct421  med_Oct430
|     1 /   1 :   0.614500     4.76944     4.66347     6.59025
|    10 /   1 :   0.780500     4.45724     4.36750     6.11651
|   100 /   1 :   1.554438     7.59995     7.41750    10.15353
|     1 /  10 :   0.761500     4.46904     4.37081     6.12175
|    10 /  10 :   0.779438     6.72776     6.62458     9.55874
|   100 /  10 :   1.512875     7.74771     7.55823    10.30993
|     1 / 100 :   0.580828     4.53871     4.40472     6.18076
|    10 / 100 :   0.703375     6.48999     6.31845     9.03147
|   100 / 100 :   1.917000     9.03255     8.49599    11.50894
|    1 / 1000 :   0.758219     4.59623     4.56923     6.31821
|   10 / 1000 :   1.198875     7.10303     7.03001     9.74554
|  100 / 1000 :   5.823250    16.21902    15.56194    16.60883