dolfin team mailing list archive

[Ilmar Wilbers <ilmarw@xxxxxxxxx>]

Yeah, I know. We will add both -llapack and -lblas to umfpack.py again. 
It is not supposed to be needed, but the reasoning is just too long to 
explain. We have been discussing it back and forth here, but this should 
do the trick. This requires lapack3-dev to be installed if atlas3-*dev 
is installed.

ilmar

Garth N. Wells wrote:
> Ilmar Wilbers wrote:
> > > > The demos are linked to lapack because umfpack needs to be linked 
> > > > to lapack. 
> > > I thought that umfpack required blas.
> > That is true, we are looking into this now.
>
> I added '-lblas' before -llapack' in umfpack.py and this fixed the 
> problem. I looks like 'ATL_dGetNB' is part of the ATLAS implementation 
> of BLAS.
>
> In trilinos.py, there is a FIXME question regarding whether or not 
> it's necessary to link with BLAS when linking to lapack. It looks BLAS 
> is needed.
>
> Garth
>
> > > I haven't had any success when installing atlas3-base-dev or setting 
> > > ATLAS_DIR. I only see the problem when running the SLEPc demo. From 
> > > 'ldd demo' I get
> > Did you generate a new umfpack.pc?
> >
> > ilmar
> > >   liblapack.so.3 => /usr/lib/atlas/liblapack.so.3 (0xb6821000)
> > >
> > > Garth
> > >
> > > Maybe I didn't understand you question properly?
> > > > ilmar
> > > >
> > > > Garth N. Wells wrote:
> > > > > Can you remind me why DOLFIN is linked to lapack? I recall a 
> > > > > thread on this a few weeks ago.
> > > > >
> > > > > Garth
> > > > >
> > > > > Ilmar Wilbers wrote:
> > > > > > I discussed the same issue with Anders earlier. The sse2 version 
> > > > > > does not install in /usr/lib/atlas as expected. Try setting 
> > > > > > ATLAS_DIR, or, perhaps better, install atlas3-base-dev instead og 
> > > > > > atlas3-sse2-dev
> > > > > >
> > > > > > ilmar
> > > > > >
> > > > > > Garth N. Wells wrote:
> > > > > > > Has anyone tried running the demo that uses SLEPc 
> > > > > > > (demo/la/eigensolver/cpp)? When I run it, I get
> > > > > > >
> > > > > > >    ./demo: symbol lookup error: 
> > > > > > > /usr/lib/atlas/sse2/liblapack.so.3: undefined symbol: ATL_dGetNB
> > > > > > >
> > > > > > > Any ideas?
> > > > > > >
> > > > > > > Garth
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