On 9 March 2011 20:53, Barry Smith <bsmith at mcs.anl.gov> wrote: > > On Mar 9, 2011, at 4:54 PM, Lisandro Dalcin wrote: > >> Barry, what's the status of this?: >> http://lists.mcs.anl.gov/pipermail/petsc-dev/2005-November/000086.html >> >> I configured with --download-c-blas-lapack, but it seems that the >> argument is plain ignored, configure.log does not provide any clue >> about what's going on, configure success, BLAS/LAPACK config vars are >> plain empty, PETSc builds fine, but at make test I get linker errors >> about missing BLAS symbols... BTW, I've manually downloaded f2c >> blas-lapack tarball, but I cannot figure out how you managed to get a >> "long double" build... > > ? Unfortunately Satish threw away that tarball of cblas/lapack and replaced > it with one generated by the lapack boys which cannot build with long double. > >> >> Do you really got it working? > > ? Yes but it won't work anymore. > > ? To top it off long double in gcc uses 128 bits but actually only uses the > 80 bit floating point units so it is not worth it. Plus the MPICH long double > operations like MPI_SUM didn't work properly. > > ? But, Jed pointed out that gcc has a new way of doing 128 bit floating > point. You may see some pushes into PETSc-dev in the next few days as I try > to get it working. Keep your eyes open. >
Are you talking about __float128 ? > ? Barry > > ?BTW: this is most definitely a petsc-dev question and not a personal > question to me. > I agree now :-). I thought I must be missing something obvious, and I didn't want to make noise. Many thanks for your clarifications... -- Lisandro Dalcin --------------- CIMEC (INTEC/CONICET-UNL) Predio CONICET-Santa Fe Colectora RN 168 Km 472, Paraje El Pozo 3000 Santa Fe, Argentina Tel: +54-342-4511594 (ext 1011) Tel/Fax: +54-342-4511169
