[petsc-users] How to create a mapping of global to local indices?

[Dongyu Liu - CITG via petsc-users]

Hi,


I am running a FEM program using PETSc. In the beginning,  the mesh is 
partitioned in gmsh, and we read the partitioned mesh using our own reader.


Now my question is: How can I get a global to local indices mapping? and do I 
need to renumber the indices after I read the partitioned mesh?


>From my understanding, the rows handled by each processor should be 
>consecutive, but the indices of nodes which I directly read from a gmsh file 
>are not. Is this an issue?


Best,


Dongyu