Use trace instead of tracing

dune-project

@@ -19,8 +19,7 @@
   (ocaml (>= "5.0.0~"))
   hdr_histogram
   (cmdliner (>= 1.1.0))
-  tracing
-  (ocaml_intrinsics (>= v0.16.1))
+  (trace-fuchsia (>= 0.10))
   (menhir :with-test)
   (alcotest (and :with-test (>= 1.9.0)))))
 

lib/olly_trace/olly_format_backend/dune

@@ -11,4 +11,4 @@
  (name olly_format_fuchsia)
  (modules olly_format_fuchsia)
  (optional)
- (libraries olly_format_backend tracing))
+ (libraries olly_format_backend trace trace-fuchsia))

lib/olly_trace/olly_format_backend/olly_format_fuchsia.ml

@@ -1,41 +1,56 @@
 open Olly_format_backend
-open Tracing
 
 let name = "fuchsia"
 let description = "Perfetto"
 
-type trace = { doms : Trace.Thread.t array; file : Trace.t }
+module Trace = Trace_fuchsia.Writer
+
+type trace = { 
+  doms : Trace.Thread_ref.t array; 
+  buf : Trace_fuchsia.Buf_chain.t;
+  subscriber : Trace_fuchsia.Subscriber.t;
+  exporter : Trace_fuchsia.Exporter.t;
+}
+
+let flush trace =
+  Trace_fuchsia.Buf_chain.ready_all_non_empty trace.buf;
+  Trace_fuchsia.Buf_chain.pop_ready trace.buf ~f:trace.exporter.write_bufs; 
+  trace.exporter.flush ()
 
 let create ~filename =
-  let file = Trace.create_for_file ~base_time:None ~filename in
+  let buf_pool = Trace_fuchsia.Buf_pool.create () in
+  let buf = Trace_fuchsia.Buf_chain.create ~sharded:false ~buf_pool () in
+  let oc = Out_channel.open_bin filename in
+  let exporter = Trace_fuchsia.Exporter.of_out_channel ~close_channel:true oc in 
+  let subscriber = Trace_fuchsia.Subscriber.create ~buf_pool ~pid:0 ~exporter () in
+  (* Adds the headers to output *)
+  Trace_fuchsia.Subscriber.Callbacks.on_init subscriber ~time_ns:0L;
   let doms =
     let max_doms = 128 in
     Array.init max_doms (fun i ->
         (* Use a different pid for each domain *)
-        Trace.allocate_thread file ~pid:i ~name:(Printf.sprintf "Ring_id %d" i))
+        Trace.Thread_ref.ref (i + 1))
   in
-  { doms; file }
+  { doms; buf; subscriber; exporter }
 
-let close trace = Trace.close trace.file
-let ts_to_span ts = ts |> Int64.to_int |> Core.Time_ns.Span.of_int_ns
+let close trace =
+  flush trace;
+  Trace_fuchsia.Subscriber.close trace.subscriber 
 
 let emit trace evt =
   let open Event in
-  let thread = trace.doms.(evt.ring_id)
-  and category = "PERF"
-  and time = ts_to_span evt.ts
+  let t_ref = trace.doms.(evt.ring_id)
+  and time_ns = evt.ts
   and name = evt.name in
   match evt.kind with
   | SpanBegin | SpanEnd ->
       let write =
-        if evt.kind = SpanBegin then Trace.write_duration_begin
-        else Trace.write_duration_end
+        if evt.kind = SpanBegin then Trace.Event.Duration_begin.encode
+        else Trace.Event.Duration_end.encode
       in
-      write trace.file ~args:[] ~thread ~category ~name ~time
+      write trace.buf ~args:[] ~t_ref ~name ~time_ns ()
   | Counter value ->
-      Trace.write_counter trace.file ~thread ~category ~name ~time
-        ~args:[ ("v", Int value) ]
+      Trace.Event.Counter.encode trace.buf ~t_ref ~name ~time_ns ~args:[ ("v", A_int value) ] ()
   | Instant ->
-      Trace.write_duration_instant trace.file ~args:[] ~thread ~category ~name
-        ~time
+      Trace.Event.Instant.encode trace.buf ~name ~args:[] ~t_ref ~time_ns () 
   | _ -> ()

runtime_events_tools.opam

@@ -13,8 +13,7 @@ depends: [
   "ocaml" {>= "5.0.0~"}
   "hdr_histogram"
   "cmdliner" {>= "1.1.0"}
-  "tracing"
-  "ocaml_intrinsics" {>= "v0.16.1"}
+  "trace-fuchsia" {>= "0.10"}
   "menhir" {with-test}
   "alcotest" {with-test & >= "1.9.0"}
   "odoc" {with-doc}

test/dune

@@ -56,15 +56,19 @@
    (run olly_bare trace --format=json test-bare-json.trace ./test_fib.exe))))
 
 ; Dummy process for testing process launching.
+
 (executables
  (names run_endlessly)
+ (modules run_endlessly)
  (libraries unix))
 
 (test
  (name test_launch)
+ (modules test_launch)
  (package runtime_events_tools)
  (enabled_if
   (>= %{ocaml_version} 5.1.0))
  (libraries olly_common alcotest)
-  (deps run_endlessly.exe)
- (action (run %{test} --show-errors)))
+ (deps run_endlessly.exe)
+ (action
+  (run %{test} --show-errors)))