Hi Bary: I will check the example you suggest. Anyhow, I’ll send a reproducible example ASAP. Thanks, Miguel On 19 Nov 2024, at 18:55, Barry Smith <[email protected]> wrote: I modify src/dm/tests/ex25.c and always see a nice even split when possible with both DM_BOUNDARY_NONE and DM_BOUNDARY_PERIODIC Can you please send a reproducible example? Thanks Barry On Nov 19, 2024, at 6:14 AM, MIGUEL MOLINOS PEREZ <[email protected]> wrote: Dear all: It seems that if I mesh a cubic domain with “DMDACreate3d” using 8 bricks for discretization and with periodic boundaries, each of the bricks has a different size. In contrast, if I use DM_BOUNDARY_NONE, all 8 bricks have the same size. I have used this together with the DMSWarm discretization. And as you can see the number of particles per rank is not evenly distributed: 210 420 366 732 420 840 732 1464 Am I missing something? Thanks, Miguel <Screenshot 2024-11-19 at 10.56.36.png>