[petsc-users] Files saved with PetscViewerBinaryOpen - Binary file format ?

[Barry Smith]

  https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecLoad.html <https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecLoad.html> and https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatLoad.html <https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatLoad.html> define the simple format. 

  There are loaders for Matlab and Python distributed with PETSc so for those two languages you do not need to write your own custom loaders.

  Barry



> On Dec 29, 2020, at 12:32 PM, C B <cebau.mail at gmail.com> wrote:
> 
> Hello PETSc community !
> 
> I would like to read in another code a matrix / rhs / sol  saved by PETSc.
> I am dealing with large matrices and for precision I would like to use the binary format.
> 
> To save a matrix I am using the following lines (please let me know if I should make any changes), I am using an old version PETSc 2.1.5 for backward compatibility.
> 
>  ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,PETSC_BINARY_CREATE,&petsc_view);CHKERRQ(ierr);
> ierr = VecView(solut,petsc_view);CHKERRQ(ierr);
> ierr = PetscViewerDestroy(petsc_view);CHKERRQ(ierr);
> 
> And to save a vector:  
> 
> ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD, filename, PETSC_BINARY_CREATE, &petsc_view);CHKERRQ(ierr);
> ierr = VecView(solut, petsc_view);CHKERRQ(ierr);
> ierr = PetscViewerDestroy(petsc_view);CHKERRQ(ierr);
> 
> The files are saved without any problems, and now I need to write the code to read the binary files.
> Please, would anyone point me to the format of these binary files and/or a code snippet to take as an example ?  
> 
> Thank you very much in advance !
> Cheers

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