add profiling for ocaml

ocaml/makefile

@@ -3,6 +3,7 @@ OC=ocamlopt
 # ocamlopt: platform-specific, faster
 # ocamlc: platform-independent intermediate representation, run with ocamlrun
 FAST=-O3 -unsafe # install flambda with opam
+PROF=-g
 
 SRC=samples.ml
 OUT=./out/samples
@@ -21,6 +22,13 @@ fast:
 time:
 	bash -c "time $(OUT)"
 
+profile:
+	$(OC) $(PERF) $(SRC) -o $(OUT)
+	mv samples.cmi samples.cmx samples.o ./out/
+	sudo perf record -g $(OUT)
+	sudo perf report
+	rm perf.data
+
 switch-opam-fast:
 	opam switch create 4.11.2+flambda 
 	eval $(opam env)