[petsc-dev] building with MKL

[Stefano Zampini]

Mark,

Why don't you use the "-mkl" flag of the Intel compiler?



Il Dom 1 Lug 2018, 21:59 Smith, Barry F. <bsmith at mcs.anl.gov> ha scritto:

>
>    Mark,
>
>     You need to send the full configure.log (it if doesn't fit for
> petsc-dev, better to send it to petsc-maint that doesn't mind big
> attachments.
>
>    Barry
>
>
> > On Jul 1, 2018, at 1:49 PM, Mark Adams <mfadams at lbl.gov> wrote:
> >
> >
> >
> > On Sun, Jul 1, 2018 at 1:43 PM Victor Eijkhout <eijkhout at tacc.utexas.edu>
> wrote:
> >
> >
> >> On Jul 1, 2018, at 12:30 PM, Jeff Hammond <jeff.science at gmail.com>
> wrote:
> >>
> >> If you really want to do this, then replace COMMON with CORE to
> specialize for SKX. There’s not point to using COMMON if you’ve got the MIC
> path already.
> >>
> >
> > We advocate CORE on our userguides, but the Intel compiler crashes
> reliably with that in certain cases. I think in particular Intel has never
> figured out how complex numbers work. If the compiler crashes it’s always
> on the petsc complex mode. I think I have submitted tickets about that, so
> maybe it’s fixed in update 3.
> >
> > I have also seen cases where CORE gives numerical problems and replacing
> by COMMON fixed them. Sorry, that was a user ticket and having solved it I
> didn’t bother to submit an Intel support ticket.
> >
> > I have unconfirmed reports of numerical problems. I will try your flags
> if I can reproduce them. Any other tricks that you used to get MKL/PETSc to
> work?
> >
> > Also, PETSc is having problems finding libs. I get this error that it
> can not find -blas and I see that there is a libmkl_blas95_ilp64.a and
> libmkl_blas95_lp64.a, but no libblas.a.
> >
> > I'm stuck, any help would be appreciated,
> >
> > Thanks,
> > Mark
> >
> > Executing: cc  -o /tmp/petsc-WPf2VB/config.libraries/conftest     -g -O0
> -hcpu=mic-knl -qopenmp-simd -fopenmp
> /tmp/petsc-WPf2VB/config.libraries/conftest.o
> -Wl,-rpath,/opt/intel/compilers_and_libraries_2018.1.163/linux/mkl/lib/intel64
> -L/opt/intel/compilers_and_libraries_2018.1.163/linux/mkl/lib/intel64
> -lblas -lstdc++ -ldl
> > Possible ERROR while running linker: exit code 256
> > stderr:
> >
> /usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ld:
> cannot find -lblas
> >                     Popping language C
> >               Unknown name mangling in BLAS/LAPACK
> > **** Configure header /tmp/petsc-WPf2VB/confdefs.h ****
> > #if !defined(INCLUDED_UNKNOWN)
> >
> >
> > The support website is a nightmare anyway, so I’m not overly motivated
> to submit support tickets in the first place.
> >
> > Victor.
>
>
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