WIP: KSP

src/ksp.jl

@@ -11,13 +11,28 @@ Base.@kwdef mutable struct KSP{PetscLib, PetscScalar} <:
     P::Union{AbstractMat, Nothing} = nothing
 end
 
+"""
+    KSP(A::AbstractMat, P::AbstractMat{PetscLib} = A; options...)
+
+Create a `KSP` using the matrix `A` and preconditioner construction matrix `P`
+with the `options`.
+
+The communicator is obtained from `A` and if it has size `1` then the garbage
+collector is set, otherwise the user is responsible for calling
+[`destroy`](@ref).
+
+# External Links
+$(_doc_external("KSP/KSPCreate"))
+$(_doc_external("KSP/KSPSetOperators"))
+$(_doc_external("KSP/KSPSetFromOptions"))
+"""
 function KSP(
     A::AbstractMat{PetscLib},
     P::AbstractMat{PetscLib} = A;
-    kwargs...,
+    options...,
 ) where {PetscLib}
     @assert initialized(PetscLib)
-    opts = Options(PetscLib; kwargs...)
+    opts = Options(PetscLib; options...)
     PetscScalar = PetscLib.PetscScalar
     ksp = KSP{PetscLib, PetscScalar}(opts = opts)
     comm = getcomm(A)
@@ -70,6 +85,34 @@ function solve!(
     return x
 end
 
+"""
+    createvecs(ksp::AbstractKSP; nright = 0, nleft = 0)
+
+Create `nright` right and `nleft` left vectors compatible with the `ksp`.
+Returned object `V` has `Tuple` members `V.right` and `V.left` containing the
+vectors.
+
+# External Links
+$(_doc_external("KSP/KSPCreateVecs"))
+"""
+function createvecs(ksp::AbstractKSP{PetscLib}; nright = 0, nleft = 0) where PetscLib
+  r_right = [Ref{CVec}() for i = 1:nright]
+  r_left = [Ref{CVec}() for i = 1:nleft]
+  LibPETSc.KSPCreateVecs(PetscLib, ksp, nright, r_right, nleft, r_left)
+
+  for i = 1:nright
+    @show r_right[i][]
+  end
+  for i = 1:nleft
+    @show r_left[i][]
+  end
+
+  right = ntuple(i -> VecPtr(PetscLib, r_right[i][], false), nright)
+  left = ntuple(i -> VecPtr(PetscLib, r_left[i][], false), nleft)
+
+  (right = right, left = left)
+end
+
 function LinearAlgebra.ldiv!(x::AbstractVec, ksp::AbstractKSP, b::AbstractVec)
     solve!(x, ksp, b)
 end

test/ksp.jl

@@ -66,6 +66,11 @@ using LinearAlgebra: mul!
             @test x ≈ y
         end
 
+        PETSc.createvecs(ksp)
+        PETSc.createvecs(ksp; nright = 1)
+        PETSc.createvecs(ksp; nleft = 2)
+        PETSc.createvecs(ksp; nright = 3, nleft = 7)
+
         # PETSc.destroy(ksp)
         PETSc.destroy(A)
         PETSc.destroy(x)