Where is DistributionMapping dm defined in Wave_AmrLevel

[lwJi]

In the example Wave_AmrLevel, I wasn't able to find where the DistributionMapping object is explicitly defined or initialized. Could you please clarify how and where it's constructed in this example?

[WeiqunZhang]

It inherits from the Amr class. For example during regrid, the DistributionMapping is created here

amrex/Src/Amr/AMReX_Amr.cpp

Line 2654 in 69ad456

new_dmap[lev].define(new_grid_places[lev]);

.

If you want to use you own DistributionMapping, you can ignore the provided DistributionMapping in you AmrLevel derived class' constructor.

[lwJi]

Terrific. Thanks!
If I create a DistributionMapping that assigns each level to a different subset of processes--effectively distributing all levels across processors simultaneously rather than level by level--do you think AMReX will handle it correctly, or could that cause issues?

[WeiqunZhang]

I think so. But you will need to derive from amrex::Amr so that you will want to change the time stepping functions.

[lwJi]

Brilliant. Thanks!
We are using our own time stepping functions for now. I would like to try it out ;)