[petsc-dev] preallocation checks

[Barry Smith]

   If the user calls an memory allocation routine should we tell them IN THEIR FACE if they did not allocate enough?

1)    For example, automatically set the error on allocation option?   or

2)    Have a new option that results in an ugly warning mess to the screeen?

    We get lots of emails where people may have allocated wrong and we then tell them, one at a time, to set the flag,

    Barry


Begin forwarded message:

> From: Jed Brown <jedbrown at mcs.anl.gov>
> Date: January 11, 2012 8:32:57 AM CST
> To: PETSc users list <petsc-users at mcs.anl.gov>
> Subject: Re: [petsc-users] lying about nullspaces
> Reply-To: PETSc users list <petsc-users at mcs.anl.gov>
> 
> On Wed, Jan 11, 2012 at 09:16, Matthew Knepley <knepley at gmail.com> wrote:
> MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_TRUE);
> 
> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatSetOption.html
> 
> If MatSetFromOptions() is called, these options can be used
> 
> -mat_new_nonzero_allocation_err
> -mat_new_nonzero_location_err

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