Trigger MKL LBT by default

Author: ChrisRackauckas

Project.toml

@@ -16,6 +16,7 @@ KLU = "ef3ab10e-7fda-4108-b977-705223b18434"
 Krylov = "ba0b0d4f-ebba-5204-a429-3ac8c609bfb7"
 Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+MKL = "33e6dc65-8f57-5167-99aa-e5a354878fb2"
 MKL_jll = "856f044c-d86e-5d09-b602-aeab76dc8ba7"
 PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 Preferences = "21216c6a-2e73-6563-6e65-726566657250"

src/LinearSolve.jl

@@ -42,6 +42,11 @@ PrecompileTools.@recompile_invalidations begin
     using SciMLBase
 
     using MKL_jll
+
+    import Preferences
+    if Preferences.@load_preference("TriggerMKLLBT", true)
+        using MKL
+    end
 end
 
 using Reexport