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Re: Slow sqp execution in Ubuntu compared to Win7?
From: |
Carlo de Falco |
Subject: |
Re: Slow sqp execution in Ubuntu compared to Win7? |
Date: |
Sat, 3 Apr 2010 10:28:10 +0200 |
On 3 Apr 2010, at 09:44, Tottish wrote:
Hmmm, I'm back at the computer but I can't really see where I have a
choice
of which BLAS/LAPACK to use?
look at the list of the dependencies for octave3.2 here:
http://packages.ubuntu.com/karmic/math/octave3.2
as you can see there are multiple choices for the package to satisfy
the dependency
on blas and lapack. in particular:
"libblas.so.3gf virtual package provided by libatlas3gf-3dnow,
libatlas3gf-base, libatlas3gf-sse, libatlas3gf-sse2, libblas3gf"
so any of the packages above can be chosen
I use Synaptic and seem to have the libatlas3gf-base installed (ATLAS,
generic shared). Is this the one for me or should I install
something else?
What?
this is highly dependent on your hardware, if you are not sure which
one of the above
is more appropriate you can just do trial-and-error.
I've made some tests and adjusted the stop criteria in sqp. When
it's set to
default (eps) it only needs four iterations to hit the mark. This
takes, as
I mentioned, about 0.24s where's one iteration takes 0.08, 2 iter
takes 0.14
and 3 iter takes 0.19s.
I guess this rather linear behavior points to the fact that it is
the actual
calculation that takes time and not the linking, right?
On the Sempron running Win7 the difference was not noticeable when
running
the same test. It took about 0.08 no matter how many iterations.
So what do you make of this? Am I stuck at the 0.24s or can I get it
faster?
Have a good one, folks!
/Totte
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Begin forwarded message:
From: Tottish <address@hidden>
Date: 3 April 2010 09:44:41 GMT+02:00
To: address@hidden
Subject: Re: Slow sqp execution in Ubuntu compared to Win7?
Hmmm, I'm back at the computer but I can't really see where I have a
choice
of which BLAS/LAPACK to use?
I use Synaptic and seem to have the libatlas3gf-base installed (ATLAS,
generic shared). Is this the one for me or should I install
something else?
What?
I've made some tests and adjusted the stop criteria in sqp. When
it's set to
default (eps) it only needs four iterations to hit the mark. This
takes, as
I mentioned, about 0.24s where's one iteration takes 0.08, 2 iter
takes 0.14
and 3 iter takes 0.19s.
I guess this rather linear behavior points to the fact that it is
the actual
calculation that takes time and not the linking, right?
On the Sempron running Win7 the difference was not noticeable when
running
the same test. It took about 0.08 no matter how many iterations.
So what do you make of this? Am I stuck at the 0.24s or can I get it
faster?
Have a good one, folks!
/Totte
--
View this message in context:
http://n4.nabble.com/Slow-sqp-execution-in-Ubuntu-compared-to-Win7-tp1749282p1749940.html
Sent from the Octave - General mailing list archive at Nabble.com.
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Help-octave mailing list
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- Slow sqp execution in Ubuntu compared to Win7?, Tottish, 2010/04/02
- Re: Slow sqp execution in Ubuntu compared to Win7?, Martin Helm, 2010/04/02
- Re: Slow sqp execution in Ubuntu compared to Win7?, Carlo de Falco, 2010/04/02
- Re: Slow sqp execution in Ubuntu compared to Win7?, Tottish, 2010/04/02
- Re: Slow sqp execution in Ubuntu compared to Win7?, Tottish, 2010/04/03
- Re: Slow sqp execution in Ubuntu compared to Win7?,
Carlo de Falco <=
- Re: Slow sqp execution in Ubuntu compared to Win7?, Tottish, 2010/04/03
- Re: Slow sqp execution in Ubuntu compared to Win7?, Judd Storrs, 2010/04/03
- Re: Slow sqp execution in Ubuntu compared to Win7?, Tottish, 2010/04/03
- Re: Slow sqp execution in Ubuntu compared to Win7?, Tottish, 2010/04/05
- Re: Slow sqp execution in Ubuntu compared to Win7?, Tottish, 2010/04/05