[petsc-users] f2cblashlapack download failure

[Najeeb Ahmad]

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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