By default, if you preallocate but not enough, it will automatically error unless you call MatSetOption(mat,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_FALSE);
> On Jul 11, 2024, at 4:02 PM, Michael Povolotskyi <mpovo...@gmail.com> wrote: > > Thank you, > > let me clarify my question. > > Imagine that I have a sparse matrix, and the number of non zero entries that > I specified is too small. > > I know that I can insert values in it but it will be slow. > > I remember there was a way to make PETSC to throw an error if a number of non > zero elements per row was bigger that was preallocated. Then I could fix my > algorithm. Is this functionality available with the current version? > > Michael. > > On 7/11/2024 3:55 PM, Barry Smith wrote: >> >> MatGetInfo() is the programmatic interface used to get this information. >> You can also run a proggram with -info and grep for malloc. >> >> Barry >> >> >>> On Jul 11, 2024, at 1:55 PM, Michael Povolotskyi <mpovo...@gmail.com> >>> <mailto:mpovo...@gmail.com> wrote: >>> >>> This Message Is From an External Sender >>> This message came from outside your organization. >>> Hello, >>> >>> is there an option in PETSC that allows to check at run time if a sparse >>> matrix has been preallocated correctly? I remember there was something >>> like that is the older versions, but cannot find it now. >>> >>> The goal is to get rid of any possible time overhead due to dynamic >>> preallocation. >>> >>> Thank you, >>> >>> Michael. >>> >>> >>
