[petsc-users] Memory usage scaling with number of processors

[Barry Smith]

  Send the code.

> On Jul 22, 2024, at 9:18 PM, Matthew Thomas via petsc-users <petsc-users at mcs.anl.gov> wrote:
> 
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> Hello,
> 
> I am using petsc and slepc to solve an eigenvalue problem for sparse matrices. When I run my code with double the number of processors, the memory usage also doubles.
> 
> I am able to reproduce this behaviour with ex1 of slepc’s hands on exercises.
> 
> The issue is occurring with petsc not with slepc as this still occurs when I remove the solve step and just create and assemble the petsc matrix.
> 
> With n=100000, this uses ~1Gb with 8 processors, but ~5Gb with 40 processors. 
> 
> This was done with petsc 3.21.3, on linux compiled with Intel using Intel-MPI
> 
> Is this the expected behaviour? If not, how can I bug fix this?
> 
> 
> Thanks,
> Matt

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