diff --git a/src/tef/trace_tef.ml b/src/tef/trace_tef.ml
index 495d772..d4410e6 100644
--- a/src/tef/trace_tef.ml
+++ b/src/tef/trace_tef.ml
@@ -1,7 +1,7 @@
 open Trace
 module A = Trace.Internal_.Atomic_
 
-module Mock_mtime_ = struct
+module Mock_ = struct
   let enabled = ref false
   let now = ref 0
 
@@ -15,8 +15,8 @@ let counter = Mtime_clock.counter ()
 
 (** Now, in microseconds *)
 let[@inline] now_us () : float =
-  if !Mock_mtime_.enabled then
-    Mock_mtime_.now_us ()
+  if !Mock_.enabled then
+    Mock_.now_us ()
   else (
     let t = Mtime_clock.count counter in
     Mtime.Span.to_float_ns t /. 1e3
@@ -91,7 +91,12 @@ module Writer = struct
       | `Stderr -> stderr, false
       | `File path -> open_out path, true
     in
-    let pid = Unix.getpid () in
+    let pid =
+      if !Mock_.enabled then
+        2
+      else
+        Unix.getpid ()
+    in
     output_char oc '[';
     { oc; first = true; pid; must_close }
 
@@ -219,7 +224,11 @@ let collector ~out () : collector =
         Thread.join t_write
       )
 
-    let[@inline] get_tid_ () : int = Thread.id (Thread.self ())
+    let[@inline] get_tid_ () : int =
+      if !Mock_.enabled then
+        3
+      else
+        Thread.id (Thread.self ())
 
     let create_span ?__FUNCTION__:_ ~__FILE__:_ ~__LINE__:_ name : span =
       let span = Int64.of_int (A.fetch_and_add span_id_gen_ 1) in
@@ -268,5 +277,5 @@ let with_setup ?out f =
   protect ~finally:Trace.shutdown f
 
 module Internal_ = struct
-  let use_mock_mtime_ () = Mock_mtime_.enabled := true
+  let mock_all_ () = Mock_.enabled := true
 end
diff --git a/src/tef/trace_tef.mli b/src/tef/trace_tef.mli
index f9d3de1..8693ee1 100644
--- a/src/tef/trace_tef.mli
+++ b/src/tef/trace_tef.mli
@@ -37,8 +37,8 @@ val with_setup : ?out:[ output | `Env ] -> (unit -> 'a) -> 'a
 (**/**)
 
 module Internal_ : sig
-  val use_mock_mtime_ : unit -> unit
-  (* use fake, deterministic timestamps *)
+  val mock_all_ : unit -> unit
+  (* use fake, deterministic timestamps, TID, PID *)
 end
 
 (**/**)
diff --git a/src/trace.ml b/src/trace.ml
index 6078100..8110e53 100644
--- a/src/trace.ml
+++ b/src/trace.ml
@@ -40,7 +40,7 @@ let[@inline] with_ ?__FUNCTION__ ~__FILE__ ~__LINE__ name f =
     (* fast path: no collector, no span *)
     f Collector.dummy_span
   | Some collector ->
-    with_collector_ collector ?__FUNCTION__ ~__FILE__ ~__LINE__ name
+    with_collector_ collector ?__FUNCTION__ ~__FILE__ ~__LINE__ name f
 
 let[@inline] message ?__FUNCTION__ ~__FILE__ ~__LINE__ msg : unit =
   match A.get collector with
diff --git a/test/t1.expected b/test/t1.expected
index 590eacd..26bd7ac 100644
--- a/test/t1.expected
+++ b/test/t1.expected
@@ -1,450 +1,450 @@
-[{"pid": 2993971,"cat":"","tid": 0,"ts": 2.00,"name":"hello 1 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 1.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 5.00,"name":"hello 1 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 4.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 8.00,"name":"hello 1 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 7.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 11.00,"name":"hello 1 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 10.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 0.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 16.00,"name":"hello 2 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 15.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 19.00,"name":"hello 2 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 18.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 22.00,"name":"hello 2 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 21.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 25.00,"name":"hello 2 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 24.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 14.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 30.00,"name":"hello 3 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 29.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 33.00,"name":"hello 3 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 32.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 36.00,"name":"hello 3 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 35.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 39.00,"name":"hello 3 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 38.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 28.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 44.00,"name":"hello 4 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 43.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 47.00,"name":"hello 4 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 46.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 50.00,"name":"hello 4 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 49.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 53.00,"name":"hello 4 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 52.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 42.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 58.00,"name":"hello 5 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 57.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 61.00,"name":"hello 5 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 60.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 64.00,"name":"hello 5 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 63.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 67.00,"name":"hello 5 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 66.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 56.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 72.00,"name":"hello 6 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 71.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 75.00,"name":"hello 6 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 74.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 78.00,"name":"hello 6 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 77.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 81.00,"name":"hello 6 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 80.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 70.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 86.00,"name":"hello 7 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 85.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 89.00,"name":"hello 7 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 88.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 92.00,"name":"hello 7 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 91.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 95.00,"name":"hello 7 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 94.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 84.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 100.00,"name":"hello 8 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 99.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 103.00,"name":"hello 8 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 102.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 106.00,"name":"hello 8 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 105.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 109.00,"name":"hello 8 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 108.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 98.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 114.00,"name":"hello 9 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 113.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 117.00,"name":"hello 9 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 116.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 120.00,"name":"hello 9 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 119.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 123.00,"name":"hello 9 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 122.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 112.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 128.00,"name":"hello 10 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 127.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 131.00,"name":"hello 10 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 130.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 134.00,"name":"hello 10 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 133.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 137.00,"name":"hello 10 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 136.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 126.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 142.00,"name":"hello 11 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 141.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 145.00,"name":"hello 11 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 144.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 148.00,"name":"hello 11 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 147.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 151.00,"name":"hello 11 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 150.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 140.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 156.00,"name":"hello 12 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 155.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 159.00,"name":"hello 12 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 158.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 162.00,"name":"hello 12 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 161.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 165.00,"name":"hello 12 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 164.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 154.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 170.00,"name":"hello 13 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 169.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 173.00,"name":"hello 13 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 172.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 176.00,"name":"hello 13 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 175.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 179.00,"name":"hello 13 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 178.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 168.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 184.00,"name":"hello 14 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 183.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 187.00,"name":"hello 14 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 186.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 190.00,"name":"hello 14 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 189.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 193.00,"name":"hello 14 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 192.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 182.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 198.00,"name":"hello 15 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 197.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 201.00,"name":"hello 15 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 200.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 204.00,"name":"hello 15 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 203.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 207.00,"name":"hello 15 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 206.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 196.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 212.00,"name":"hello 16 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 211.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 215.00,"name":"hello 16 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 214.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 218.00,"name":"hello 16 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 217.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 221.00,"name":"hello 16 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 220.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 210.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 226.00,"name":"hello 17 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 225.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 229.00,"name":"hello 17 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 228.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 232.00,"name":"hello 17 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 231.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 235.00,"name":"hello 17 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 234.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 224.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 240.00,"name":"hello 18 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 239.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 243.00,"name":"hello 18 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 242.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 246.00,"name":"hello 18 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 245.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 249.00,"name":"hello 18 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 248.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 238.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 254.00,"name":"hello 19 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 253.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 257.00,"name":"hello 19 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 256.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 260.00,"name":"hello 19 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 259.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 263.00,"name":"hello 19 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 262.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 252.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 268.00,"name":"hello 20 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 267.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 271.00,"name":"hello 20 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 270.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 274.00,"name":"hello 20 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 273.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 277.00,"name":"hello 20 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 276.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 266.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 282.00,"name":"hello 21 2","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 281.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 285.00,"name":"hello 21 3","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 284.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 288.00,"name":"hello 21 4","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 287.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 291.00,"name":"hello 21 5","ph":"I"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 2.00,"ts": 290.00,"name":"inner.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"dur": 13.00,"ts": 280.00,"name":"outer.loop","ph":"X"},
-{"pid": 2993971,"cat":"","tid": 0,"ts": 296.00,"name":"hello 22 2","ph":"I"},
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+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 654.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"dur": 13.00,"ts": 644.00,"name":"outer.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 660.00,"name":"hello 48 2","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 659.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 663.00,"name":"hello 48 3","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 662.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 666.00,"name":"hello 48 4","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 665.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 669.00,"name":"hello 48 5","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 668.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"dur": 13.00,"ts": 658.00,"name":"outer.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 674.00,"name":"hello 49 2","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 673.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 677.00,"name":"hello 49 3","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 676.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 680.00,"name":"hello 49 4","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 679.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 683.00,"name":"hello 49 5","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 682.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"dur": 13.00,"ts": 672.00,"name":"outer.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 688.00,"name":"hello 50 2","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 687.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 691.00,"name":"hello 50 3","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 690.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 694.00,"name":"hello 50 4","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 693.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"ts": 697.00,"name":"hello 50 5","ph":"I"},
+{"pid": 2,"cat":"","tid": 3,"dur": 2.00,"ts": 696.00,"name":"inner.loop","ph":"X"},
+{"pid": 2,"cat":"","tid": 3,"dur": 13.00,"ts": 686.00,"name":"outer.loop","ph":"X"}]
\ No newline at end of file
diff --git a/test/t1.ml b/test/t1.ml
index ac52a42..7080766 100644
--- a/test/t1.ml
+++ b/test/t1.ml
@@ -8,5 +8,5 @@ let run () =
   done
 
 let () =
-  Trace_tef.Internal_.use_mock_mtime_ ();
+  Trace_tef.Internal_.mock_all_ ();
   Trace_tef.with_setup ~out:`Stdout @@ fun () -> run ()