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Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.]
From: |
Tatsuro MATSUOKA |
Subject: |
Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.] |
Date: |
Tue, 21 Feb 2012 08:27:13 +0900 (JST) |
Hello Martin
Thank you for the explanation!
Regards
Tatsuro
--- On Mon, 2012/2/20, Martin Helm wrote:
> Am 20.02.2012 11:04, schrieb Tatsuro MATSUOKA:
> > Hello
> >
> > Please tell me which is correct to measure the performance.
> >
> > 1. n=2000; A=randn(n); B=randn(n);tic; C=A*B; t=toc, MFLOPS=2*n^3/t*1e-6
> >
> > 2. n=2000; A=randn(n); B=randn(n);ta=cputime; C=A*B; t=cputime-ta,
> > MFLOPS=2*n^3/t*1e-6
> >
> > Case 1 gives two - four times faster than that of the case 2.
> >
> > Example
> > octave:2> n=2000; A=randn(n); B=randn(n);tic; C=A*B; t=toc,
> > MFLOPS=2*n^3/t*1e-6
> > t = 0.70904
> > MFLOPS = 2.2566e+004
> > octave:3> n=2000; A=randn(n); B=randn(n);ta=cputime; C=A*B; t=cputime-ta,
> > MFLOPS=2*n^3/t*1e-6
> > t = 1.4040
> > MFLOPS = 1.1396e+004
> >
> >
> > Which test is correct to check the performance.
> >
> > Regards
> >
> > Tatsuro
> >
> The cputime sums together the time spent on all cpu's so if it runs lets
> say a total of 4sec till its complete parallel on 4 cpu's then cputime
> will give 16sec.
> You better use tic/toc.
>
- Re: Octave 3.6.0 on Windows XP plot fails., (continued)
- Re: Octave 3.6.0 on Windows XP plot fails., Michael Goffioul, 2012/02/17
- Re: Octave 3.6.0 on Windows XP plot fails., nitnit, 2012/02/18
- MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], Philip Nienhuis, 2012/02/19
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], nitnit, 2012/02/19
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], Xianyi Zhang, 2012/02/19
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], nitnit, 2012/02/20
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], Tatsuro MATSUOKA, 2012/02/20
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], Tatsuro MATSUOKA, 2012/02/20
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], Xianyi Zhang, 2012/02/20
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.], Martin Helm, 2012/02/20
- Re: MinGW libblas [WAS: Re: Octave 3.6.0 on Windows XP plot fails.],
Tatsuro MATSUOKA <=
- Re: Octave 3.6.0 on Windows XP plot fails., Tatsuro MATSUOKA, 2012/02/21
- Re: Octave 3.6.0 on Windows XP plot fails., nitnit, 2012/02/21
- Re: Octave 3.6.0 on Windows XP plot fails., PhilipNienhuis, 2012/02/23
- Re: Octave 3.6.0 on Windows XP plot fails., Xianyi Zhang, 2012/02/25
- Re: Octave 3.6.0 on Windows XP plot fails., nitnit, 2012/02/25
- Re: Octave 3.6.0 on Windows XP plot fails., Xianyi Zhang, 2012/02/26
- Re: Octave 3.6.0 on Windows XP plot fails., maiky76, 2012/02/26
- Re: Octave 3.6.0 on Windows XP plot fails., Xianyi Zhang, 2012/02/27
- Re: Octave 3.6.0 on Windows XP plot fails., nitnit, 2012/02/27
- Re: Octave 3.6.0 on Windows XP plot fails., maiky76, 2012/02/29