[petsc-users] f2cblashlapack download failure

[Satish Balay]

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.
> > >
> > >
> >
> >
> 
>