Optimize attribute loading

Summary:
Optimize attribute loading by caching all attributes read from file in
memory.  This reduces io and allocation rate and raises memory usage.

Reviewed By: cristianoc

Differential Revision: D3321156

fbshipit-source-id: 37bc6bc

infer/src/IR/AttributesTable.re

@@ -56,10 +56,18 @@ let store_attributes proc_attributes => {
   }
 };
 
-let load_attributes proc_name => {
+let attr_tbl = Procname.Hash.create 16;
+
+let load_attributes proc_name =>
+  try (Procname.Hash.find attr_tbl proc_name) {
+  | Not_found =>
     let attributes_file = res_dir_attr_filename proc_name;
-  Serialization.from_file serializer attributes_file
-};
+    let attr = Serialization.from_file serializer attributes_file;
+    if (attr != None) {
+      Procname.Hash.add attr_tbl proc_name attr
+    };
+    attr
+  };
 
 
 /** Given a procdesure name, find the file where it is defined and */
@@ -97,3 +105,22 @@ let pname_is_cpp_model callee_pname =>
     DB.file_is_in_cpp_model file
   | None => false
   };
+
+let stats () => {
+  let stats = Procname.Hash.stats attr_tbl;
+  let {Hashtbl.num_bindings: num_bindings, num_buckets, max_bucket_length} = stats;
+  let serialized_size = lazy (Marshal.data_size (Marshal.to_bytes attr_tbl []) 0 / 1024);
+  (
+    "AttributesTable.attr_tbl",
+    `Assoc (
+      [
+        ("num_bindings", `Int num_bindings),
+        ("num_buckets", `Int num_buckets),
+        ("max_bucket_length", `Int max_bucket_length)
+      ]
+        @ (
+        Config.developer_mode ? [("serialized_size_kb", `Int (Lazy.force serialized_size))] : []
+      )
+    )
+  )
+};

infer/src/IR/AttributesTable.rei

@@ -9,11 +9,11 @@
  * LICENSE file in the root directory of this source tree. An additional grant
  * of patent rights can be found in the PATENTS file in the same directory.
  */
+/** Module to manage the table of attributes. */
 
 open! Utils;
 
 
-/** Module to manage the table of attributes. */
 /** Save .attr file for the procedure into the attributes database. */
 let store_attributes: ProcAttributes.t => unit;
 
@@ -32,5 +32,8 @@ let find_tenv_from_class_of_proc: Procname.t => option Tenv.t;
 /** finding the tenv that corresponds to the class definition.  */
 let get_correct_type_from_objc_class_name: Mangled.t => option Sil.typ;
 
+
 /** Returns true if the method is defined as a C++ model */
-let pname_is_cpp_model : Procname.t => bool;
+let pname_is_cpp_model: Procname.t => bool;
+
+let stats: unit => (string, Yojson.json);

infer/src/backend/PerfStats.ml

@@ -25,7 +25,7 @@ let register_report_at_exit file =
         let exit_timeofday = Unix.gettimeofday () in
         let exit_times = Unix.times () in
         let stats =
-          `Assoc [
+          `Assoc ([
               ("rtime", `Float (exit_timeofday -. initial_timeofday)) ;
               ("utime", `Float (exit_times.tms_utime -. initial_times.tms_utime)) ;
               ("stime", `Float (exit_times.tms_stime -. initial_times.tms_stime)) ;
@@ -40,8 +40,8 @@ let register_report_at_exit file =
               ("compactions", `Int gc_stats.compactions) ;
               ("top_heap_gb", `Float (words_to_gb (float_of_int gc_stats.top_heap_words))) ;
               ("stack_kb", `Float (words_to_kb (float_of_int gc_stats.stack_size))) ;
-            ("minor_heap_kb", `Float (words_to_kb (float_of_int gc_ctrl.minor_heap_size))) ;
-          ] in
+              ("minor_heap_kb", `Float (words_to_kb (float_of_int gc_ctrl.minor_heap_size)))
+            ] @ [AttributesTable.stats ()]) in
         try
           let stats_oc = open_out file in
           Yojson.pretty_to_channel stats_oc stats ;