An interface to PETSc SNES nonlinear solve would be nice

[vpuri3]

No description provided.

[avik-pal]

I was trying to get this done, but in the current state PETSc isn't even installable with DiffEqBase:

(NonlinearSolve) pkg> add PETSc
   Resolving package versions...
ERROR: Unsatisfiable requirements detected for package DocStringExtensions [ffbed154]:
 DocStringExtensions [ffbed154] log:
 ├─possible versions are: 0.4.6-0.9.3 or uninstalled
 ├─restricted by compatibility requirements with DiffEqBase [2b5f629d] to versions: 0.9.0-0.9.3
 │ └─DiffEqBase [2b5f629d] log:
 │   ├─possible versions are: 3.13.2-6.147.0 or uninstalled
 │   └─restricted to versions 6.146.0-6 by NonlinearSolve [8913a72c], leaving only versions: 6.146.0-6.147.0
 │     └─NonlinearSolve [8913a72c] log:
 │       ├─possible versions are: 3.5.6 or uninstalled
 │       └─NonlinearSolve [8913a72c] is fixed to version 3.5.6
 └─restricted by compatibility requirements with MPI [da04e1cc] to versions: 0.8.0-0.8.6 — no versions left
   └─MPI [da04e1cc] log:
     ├─possible versions are: 0.7.0-0.20.19 or uninstalled
     └─restricted by compatibility requirements with PETSc [ace2c81b] to versions: 0.15.0-0.19.2
       └─PETSc [ace2c81b] log:
         ├─possible versions are: 0.1.2-0.1.3 or uninstalled
         └─restricted to versions * by an explicit requirement, leaving only versions: 0.1.2-0.1.3

Also, their Julia documentation is extremely sparse which makes it almost impossible to figure out how to use the different solvers.

There is https://github.com/gridap/GridapPETSc.jl/ but again the amount of docs they have is pretty much zero apart from API (unless I am looking at the wrong place).

I also seem to remember there was a recent package which wrapped the Petsc functionality in julia but lacked support for the nonlinear stuff.

Point being I don't think this will be handled anytime soon, till we have a decent Petsc wrapper in Julia.