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Added parallel jacobi #10

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Mar 19, 2021
Merged

Added parallel jacobi #10

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2 changes: 1 addition & 1 deletion src/ExtendableSparse.jl
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Expand Up @@ -10,7 +10,7 @@ include("preconditioners.jl")
include("sprand.jl")

export SparseMatrixLNK,ExtendableSparseMatrix,flush!,nnz, sprand!,sprand_sdd!, fdrand,fdrand!
export JacobiPreconditioner, ILU0Preconditioner, updateindex!
export JacobiPreconditioner, ILU0Preconditioner, ParallelJacobiPreconditioner, updateindex!

export colptrs
end # module
37 changes: 37 additions & 0 deletions src/parallel_jacobi.jl
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@@ -0,0 +1,37 @@
struct ParallelJacobiPreconditioner{Tv, Ti} <: AbstractExtendablePreconditioner{Tv,Ti}
extmatrix::ExtendableSparseMatrix{Tv,Ti}
invdiag::Array{Tv,1}
end

function update!(precon::ParallelJacobiPreconditioner)
cscmatrix=precon.extmatrix.cscmatrix
invdiag=precon.invdiag
n=cscmatrix.n
Threads.@threads for i=1:n
@inbounds invdiag[i]=1.0/cscmatrix[i,i]
end
precon
end

function ParallelJacobiPreconditioner(extmatrix::ExtendableSparseMatrix{Tv,Ti}) where {Tv,Ti}
@assert size(extmatrix,1)==size(extmatrix,2)
flush!(extmatrix)
invdiag=Array{Tv,1}(undef,extmatrix.cscmatrix.n)
precon=JacobiPreconditioner{Tv, Ti}(extmatrix,invdiag)
update!(precon)
end

ParallelJacobiPreconditioner(cscmatrix::SparseMatrixCSC{Tv,Ti}) where {Tv,Ti}=ParallelJacobiPreconditioner(ExtendableSparseMatrix(cscmatrix))


function LinearAlgebra.ldiv!(u::AbstractArray{T,1} where T, precon::ParallelJacobiPreconditioner, v::AbstractArray{T,1} where T)
invdiag=precon.invdiag
n=length(invdiag)
Threads.@threads for i=1:n
@inbounds u[i]=invdiag[i]*v[i]
end
end

function LinearAlgebra.ldiv!(precon::ParallelJacobiPreconditioner, v::AbstractArray{T,1} where T)
ldiv!(v, precon, v)
end
2 changes: 2 additions & 0 deletions src/preconditioners.jl
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Expand Up @@ -25,4 +25,6 @@ timestamp!(precon::AbstractExtendablePreconditioner)= precon.pattern_timestamp=t

include("jacobi.jl")
include("ilu0.jl")

include("parallel_jacobi.jl")