Thanks a lot Satish. I will try it out. On Wed, Jun 20, 2018 at 1:56 PM Satish Balay <[email protected]> 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 <[email protected]> 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*
