From 5cb81a4245ced16b2df85893893e7a464d7dbb47 Mon Sep 17 00:00:00 2001
From: odow <o.dowson@gmail.com>
Date: Thu, 16 Dec 2021 08:42:27 +1300
Subject: [PATCH 1/2] [perf] more latency improvements

---
 perf/time_to_first_solve/script.jl |  6 ++++++
 src/Bridges/Bridges.jl             |  4 ++++
 src/Bridges/precompile.jl          | 14 ++++++++++++++
 src/Utilities/precompile.jl        |  1 +
 4 files changed, 25 insertions(+)
 create mode 100644 src/Bridges/precompile.jl

diff --git a/perf/time_to_first_solve/script.jl b/perf/time_to_first_solve/script.jl
index ffea63701a..be2f5fdfea 100644
--- a/perf/time_to_first_solve/script.jl
+++ b/perf/time_to_first_solve/script.jl
@@ -80,3 +80,9 @@ if length(ARGS) > 0
     end
     exit(0)
 end
+
+# using SnoopCompileCore
+# tinf = @snoopi_deep example_diet(Clp.Optimizer, true)
+# using SnoopCompile, ProfileView
+# fg = flamegraph(tinf)
+# ProfileView.view(fg)
diff --git a/src/Bridges/Bridges.jl b/src/Bridges/Bridges.jl
index aa9bc4f9c8..42d7695078 100644
--- a/src/Bridges/Bridges.jl
+++ b/src/Bridges/Bridges.jl
@@ -175,4 +175,8 @@ function Base.show(io::IO, B::AbstractBridgeOptimizer)
     return
 end
 
+if VERSION > v"1.4.2"
+    include("precompile.jl")
+end
+
 end
diff --git a/src/Bridges/precompile.jl b/src/Bridges/precompile.jl
new file mode 100644
index 0000000000..77f99e879d
--- /dev/null
+++ b/src/Bridges/precompile.jl
@@ -0,0 +1,14 @@
+function _precompile_()
+    ccall(:jl_generating_output, Cint, ()) == 1 || return nothing
+    Base.precompile(
+        full_bridge_optimizer,
+        (MOI.AbstractOptimizer, Type{Float64}),
+    )
+    Base.precompile(
+        unbridged_function,
+        (LazyBridgeOptimizer, MOI.AbstractScalarFunction),
+    )   # time: 0.1381832
+    return
+end
+
+_precompile_()
diff --git a/src/Utilities/precompile.jl b/src/Utilities/precompile.jl
index 8a89ae7a18..969eb3c2ea 100644
--- a/src/Utilities/precompile.jl
+++ b/src/Utilities/precompile.jl
@@ -40,5 +40,6 @@ function _precompile_()
         CachingOptimizer{MOI.AbstractOptimizer,UniversalFallback{Model{T}}},
         constraints,
     )
+    Base.precompile(UniversalFallback, (Model{T},))
     return
 end

From ea40b2d52e980af36fb69ab3a158db24f9fe76e0 Mon Sep 17 00:00:00 2001
From: odow <o.dowson@gmail.com>
Date: Thu, 16 Dec 2021 08:50:11 +1300
Subject: [PATCH 2/2] Fix innocuous type conversion

---
 src/Utilities/universalfallback.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Utilities/universalfallback.jl b/src/Utilities/universalfallback.jl
index 9a96a918a9..04b5dce9aa 100644
--- a/src/Utilities/universalfallback.jl
+++ b/src/Utilities/universalfallback.jl
@@ -29,7 +29,7 @@ mutable struct UniversalFallback{MT} <: MOI.ModelLike
         return new{typeof(model)}(
             model,
             nothing,
-            OrderedDict{Tuple{Type,Type},OrderedDict}(),
+            OrderedDict{Type,OrderedDict}(),
             OrderedDict{Tuple{Type,Type},VectorOfConstraints}(),
             Dict{MOI.ConstraintIndex,String}(),
             nothing,