diff --git a/Makefile b/Makefile
index 942abc33..8b9ca617 100644
--- a/Makefile
+++ b/Makefile
@@ -23,6 +23,9 @@ bin:
 	$(COMP) $(FLAGS) $(BIN)
 	cp $(BIN) $(NAME) && rm $(BIN)
 
+bench: bin
+	OCAML_LANDMARKS=on,output=temporary,format=json ./$(NAME) tests/pigeon/hole8.cnf
+
 test_bin:
 	$(COMP) $(FLAGS) $(TEST_BIN)
 
diff --git a/_tags b/_tags
index 31793d6e..154f72ec 100644
--- a/_tags
+++ b/_tags
@@ -4,6 +4,9 @@ true: bin_annot, color(always)
 # optimization options
 true: inline(100), optimize(3), unbox_closures, unbox_closures_factor(20)
 
+# landmarks profiling
+<**/*>: package(landmarks), package(landmarks.ppx)
+
 # Include paths
 <src>: include
 <src/core>: include
diff --git a/src/core/internal.ml b/src/core/internal.ml
index 5fac1e30..4eec8c1c 100644
--- a/src/core/internal.ml
+++ b/src/core/internal.ml
@@ -4,6 +4,8 @@ Copyright 2014 Guillaume Bury
 Copyright 2014 Simon Cruanes
 *)
 
+[@@@landmark "auto"]
+
 module Make
     (St : Solver_types.S)
     (Plugin : Plugin_intf.S with type term = St.term
diff --git a/src/main.ml b/src/main.ml
index 2c7abeec..47750217 100644
--- a/src/main.ml
+++ b/src/main.ml
@@ -4,6 +4,8 @@ Copyright 2014 Guillaume Bury
 Copyright 2014 Simon Cruanes
 *)
 
+[@@@landmark "auto"]
+
 exception Incorrect_model
 exception Out_of_time
 exception Out_of_space
diff --git a/src/util/iheap.ml b/src/util/iheap.ml
index 25bbbb18..157bf969 100644
--- a/src/util/iheap.ml
+++ b/src/util/iheap.ml
@@ -11,6 +11,8 @@
 (*                                                                        *)
 (**************************************************************************)
 
+[@@@landmark "auto"]
+
 module V = Sparse_vec
 
 type t = {heap : int Vec.t; indices : int V.t }
diff --git a/src/util/vec.ml b/src/util/vec.ml
index b3b248f6..98f2880d 100644
--- a/src/util/vec.ml
+++ b/src/util/vec.ml
@@ -11,6 +11,8 @@
 (*                                                                        *)
 (**************************************************************************)
 
+[@@@landmark "auto"]
+
 type 'a t = { mutable dummy: 'a; mutable data : 'a array; mutable sz : int }
 
 let _size_too_big()=