Fix perf stats filename for relative path clusters

Summary:
The computation of the perf stats file did not work in case -cluster was
passed a (relative) path.

Also, do not fail if the perf stats file cannot be opened/written, just
log a warning to stdout.

Reviewed By: jvillard

Differential Revision: D3269727

fb-gh-sync-id: c141ffa
fbshipit-source-id: c141ffa

infer/src/backend/PerfStats.ml

@@ -13,25 +13,28 @@ open! Utils
 
 let register_report_at_exit file =
   Pervasives.at_exit (fun () ->
-      let gc_stats = Gc.quick_stat () in
-      let exit_timeofday = Unix.gettimeofday () in
-      let exit_times = Unix.times () in
-      let stats =
-        `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)) ;
-          ("cutime", `Float (exit_times.tms_cutime -. initial_times.tms_cutime)) ;
-          ("cstime", `Float (exit_times.tms_cstime -. initial_times.tms_cstime)) ;
-          ("minor_words", `Float gc_stats.minor_words) ;
-          ("promoted_words", `Float gc_stats.promoted_words) ;
-          ("major_words", `Float gc_stats.major_words) ;
-          ("minor_collections", `Int gc_stats.minor_collections) ;
-          ("major_collections", `Int gc_stats.major_collections) ;
-          ("compactions", `Int gc_stats.compactions) ;
-          ("top_heap_words", `Int gc_stats.top_heap_words) ;
-        ] in
-      let stats_oc = open_out file in
-      Yojson.Basic.pretty_to_channel stats_oc stats ;
-      close_out stats_oc
+      try
+        let gc_stats = Gc.quick_stat () in
+        let exit_timeofday = Unix.gettimeofday () in
+        let exit_times = Unix.times () in
+        let stats =
+          `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)) ;
+            ("cutime", `Float (exit_times.tms_cutime -. initial_times.tms_cutime)) ;
+            ("cstime", `Float (exit_times.tms_cstime -. initial_times.tms_cstime)) ;
+            ("minor_words", `Float gc_stats.minor_words) ;
+            ("promoted_words", `Float gc_stats.promoted_words) ;
+            ("major_words", `Float gc_stats.major_words) ;
+            ("minor_collections", `Int gc_stats.minor_collections) ;
+            ("major_collections", `Int gc_stats.major_collections) ;
+            ("compactions", `Int gc_stats.compactions) ;
+            ("top_heap_words", `Int gc_stats.top_heap_words) ;
+          ] in
+        let stats_oc = open_out file in
+        Yojson.Basic.pretty_to_channel stats_oc stats ;
+        close_out stats_oc
+      with _ ->
+        Format.fprintf Format.std_formatter "Info: failed to write stats to %s@." file
     )

infer/src/backend/inferanalyze.ml

@@ -355,7 +355,7 @@ let process_cluster_cmdline fname =
 
 let register_perf_stats_report () =
   let stats_dir = Filename.concat !Config.results_dir Config.backend_stats_dir_name in
-  let cluster = match !cluster_cmdline with Some cl -> "_" ^ cl | None -> "" in
+  let cluster = match !cluster_cmdline with Some cl -> "_" ^ (Filename.basename cl) | None -> "" in
   let stats_file = Filename.concat stats_dir (Config.perf_stats_prefix ^ cluster ^ ".json") in
   DB.create_dir !Config.results_dir ;
   DB.create_dir stats_dir ;