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

[Ceral Paquet]

URL:
  <http://savannah.gnu.org/bugs/?46830>

                 Summary: Multiplication about 4x slower than Matlab
                 Project: GNU Octave
            Submitted by: octavebugs
            Submitted on: Wed 06 Jan 2016 10:03:28 AM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.1-rc1
        Operating System: GNU/Linux

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Details:

The following code is much slower in Octave than Matlab. I have run it on 2
different machines+verions: v3.81 32-bit from the Ubuntu repo and v4.01 64-bit
compiled locally with openblas. Sorry I don't know what package implements the
.* operator.


function hello()

A=rand(3000);B=rand(3000);
tic;for k=1:20;C=A.*B;end;toc


Octave:
>> hello
Elapsed time is 0.924918 seconds.
>> hello
Elapsed time is 0.935749 seconds.
>> hello
Elapsed time is 0.95104 seconds.


Matlab:
>> hello
Elapsed time is 0.213288 seconds.
>> hello
Elapsed time is 0.214244 seconds.
>> hello
Elapsed time is 0.214326 seconds.






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