On Mon, Oct 4, 2021 at 9:26 AM Peder Jørgensgaard Olesen via petsc-users <petsc-users@mcs.anl.gov> wrote:

Hello

I have a binary file in which a mix of different objects is stored (Vecs, Mats, PetscInts). I can read each element just fine using VecLoad, MatLoad, and PetscIntView, provided they're read in the order in which they were put in the binary. What I would like to do is to skip the reading of any unneeded element, instead proceeding directly to the next one. I tried using PetscBinarySeek() for this, as shown in the attached code. This produces segmentation faults, suggesting that the file pointer isn't going where I want it to.

There is header information you also have to skip for each object.

We can go over the sizes  for that (it is best just to look at the code), but that is fragile. A more robust way to achieve this random
access is to use HDF5 and name the objects.

  Thanks,

     Matt

Any suggestions as to what I'm doing wrong here?


Best regards,

Peder
Peder Jørgensgaard Olesen
PhD student
Department of Mechanical Engineering
 
pjool@mek.dtu.dk
Koppels Allé
Building 403, room 105
2800 Kgs. Lyngby
www.dtu.dk/english



--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener