[petsc-users] f2cblashlapack download failure

[Najeeb Ahmad]

Thanks a lot Satish. I will try it out.

On Wed, Jun 20, 2018 at 1:56 PM Satish Balay <balay at mcs.anl.gov> wrote:

> Hm - matlab [64bit] uses ILP64 mkl.
>
> You can try using the same ILP64 mkl from matlab - and compare.
>
> for eg:
>
> ./configure PETSC_ARCH=arch-test
> --with-blaslapack-lib=/soft/com/packages/MATLAB/R2016abin/glnxa64/mkl.so
> -known-64-bit-blas-indices=1
>
> Or use openblas:
>
> ./configure --download-openblas --download-openblas-64-bit-blas-indices=1
>
> Satish
>
> On Wed, 20 Jun 2018, Najeeb Ahmad wrote:
>
> > Thanks for your prompt response Satish.
> >
> > I was getting difference in results precision between PETSc and MATLAB
> and
> > therefore wanted to try if PetscReal precision is an issue. Just noted
> that
> > KSP is converging with Residual norm of 9.283109e-02 although I have
> > specified -ksp_atol 1E-10 in my command options. Here is the solver setup
> > code:
> >
> >  ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
> >   ierr = KSPSetOperators(ksp,A,A);CHKERRQ(ierr);
> >   ierr = KSPSetType(ksp, KSPGMRES);CHKERRQ(ierr);
> >   ierr = KSPGetPC(ksp,&pc);CHKERRQ(ierr);
> >   ierr = PCSetType(pc, PCJACOBI);
> >   ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
> >   ierr = KSPSetUp(ksp);CHKERRQ(ierr);
> >
> > Thanks for your assistance.
> >
> > On Wed, Jun 20, 2018 at 1:13 PM Satish Balay <balay at mcs.anl.gov> wrote:
> >
> > > Yes - ftp.mcs.anl.gov is down - and likely to be down for many hours.
> > >
> > > Sorry for the inconvinence.
> > >
> > > Unless quad precision is needed - system blas (on most machines) should
> > > work.
> > >
> > > Satish
> > >
> > >
> > > On Wed, 20 Jun 2018, Najeeb Ahmad wrote:
> > >
> > > > Hi,
> > > >
> > > > I am trying to configure PETSc with --download-f2cblaslapack but the
> > > > library couldn't be downloaded. I also tried to access the URL
> manually
> > > but
> > > > it is not accessible. Is the download server under maintenance? The
> URLs
> > > > tried by PETSc for the download are:
> > > >
> > > >
> > >
> http://ftp.mcs.anl.gov/pub/petsc/externalpackages/f2cblaslapack-3.4.2.q3.tar.gz
> > > >
> > > > and
> > > >
> > > >
> > >
> ftp://ftp.mcs.anl.gov/pub/petsc/externalpackages/f2cblaslapack-3.4.2.q3.tar.gz
> > > >
> > > > Thanks for your assistance.
> > > >
> > > >
> > >
> > >
> >
> >
>
>

-- 
*Najeeb Ahmad*


*Research and Teaching Assistant*
*PARallel and MultiCORE Computing Laboratory (ParCoreLab) *

*Computer Science and Engineering*
*Koç University, Istanbul, Turkey*
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