Add helpful info message for threads

Author: ranjanan

src/utils.jl

@@ -125,6 +125,7 @@ spmatvec(A::SparseMatrixCSC{TA,S}, x::StridedVector{Tx}) where {TA,S,Tx} =
 # export spmatvec
 
 @static if haskey(ENV, "JULIA_NUM_THREADS")
+    info("Initializing AMG to use $(nthreads()) threads")
     import Base: *
     function *(A::SparseMatrixCSC{T,V}, b::Vector{T}) where {T,V}
         m, n = size(A)