diff --git a/test/fiber/t_fls.expected b/test/fiber/t_fls.expected
index 9c046594..b4de9eee 100644
--- a/test/fiber/t_fls.expected
+++ b/test/fiber/t_fls.expected
@@ -1,3 +1,1936 @@
+run test on pool = ws_pool
+tracing complete
+spans:
+  "top_0"
+    "child.0.0"
+      "child.0.0.99.await_children"
+      "child_0.0.0"
+        "child_0.0.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.0.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_0.0.1"
+        "child_0.0.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.0.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.0.1"
+      "child.0.1.99.await_children"
+      "child_0.1.0"
+        "child_0.1.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.1.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_0.1.1"
+        "child_0.1.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.1.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.0.2"
+      "child.0.2.99.await_children"
+      "child_0.2.0"
+        "child_0.2.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.2.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_0.2.1"
+        "child_0.2.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.2.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.0.3"
+      "child.0.3.99.await_children"
+      "child_0.3.0"
+        "child_0.3.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.3.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_0.3.1"
+        "child_0.3.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.3.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.0.4"
+      "child.0.4.99.await_children"
+      "child_0.4.0"
+        "child_0.4.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.4.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_0.4.1"
+        "child_0.4.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_0.4.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+  "top_1"
+    "child.1.0"
+      "child.1.0.99.await_children"
+      "child_1.0.0"
+        "child_1.0.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.0.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_1.0.1"
+        "child_1.0.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.0.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.1.1"
+      "child.1.1.99.await_children"
+      "child_1.1.0"
+        "child_1.1.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.1.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_1.1.1"
+        "child_1.1.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.1.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.1.2"
+      "child.1.2.99.await_children"
+      "child_1.2.0"
+        "child_1.2.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.2.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_1.2.1"
+        "child_1.2.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.2.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.1.3"
+      "child.1.3.99.await_children"
+      "child_1.3.0"
+        "child_1.3.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.3.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_1.3.1"
+        "child_1.3.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.3.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.1.4"
+      "child.1.4.99.await_children"
+      "child_1.4.0"
+        "child_1.4.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.4.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_1.4.1"
+        "child_1.4.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_1.4.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+  "top_2"
+    "child.2.0"
+      "child.2.0.99.await_children"
+      "child_2.0.0"
+        "child_2.0.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.0.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_2.0.1"
+        "child_2.0.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.0.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.2.1"
+      "child.2.1.99.await_children"
+      "child_2.1.0"
+        "child_2.1.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.1.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_2.1.1"
+        "child_2.1.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.1.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.2.2"
+      "child.2.2.99.await_children"
+      "child_2.2.0"
+        "child_2.2.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.2.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_2.2.1"
+        "child_2.2.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.2.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.2.3"
+      "child.2.3.99.await_children"
+      "child_2.3.0"
+        "child_2.3.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.3.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_2.3.1"
+        "child_2.3.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.3.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.2.4"
+      "child.2.4.99.await_children"
+      "child_2.4.0"
+        "child_2.4.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.4.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_2.4.1"
+        "child_2.4.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_2.4.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+  "top_3"
+    "child.3.0"
+      "child.3.0.99.await_children"
+      "child_3.0.0"
+        "child_3.0.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_3.0.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_3.0.1"
+        "child_3.0.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_3.0.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
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+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.3.1"
+      "child.3.1.99.await_children"
+      "child_3.1.0"
+        "child_3.1.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_3.1.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
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+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
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+        "iter.loop 09"
+        "iter.loop 10"
+      "child_3.1.1"
+        "child_3.1.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_3.1.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
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+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
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+        "iter.loop 09"
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+    "child.3.2"
+      "child.3.2.99.await_children"
+      "child_3.2.0"
+        "child_3.2.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_3.2.0.1"
+          "iter.loop 1"
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+          "iter.loop 4"
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+      "child_3.2.1"
+        "child_3.2.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_3.2.1.1"
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+    "child.3.3"
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+      "child_3.3.0"
+        "child_3.3.0.0"
+          "iter.loop 1"
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+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_3.3.0.1"
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+      "child_3.3.1"
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+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_3.3.1.1"
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+    "child.3.4"
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+      "child_3.4.0"
+        "child_3.4.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_3.4.0.1"
+          "iter.loop 1"
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+          "iter.loop 3"
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+      "child_3.4.1"
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+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_3.4.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
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+        "iter.loop 06"
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+      "child_4.0.0"
+        "child_4.0.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_4.0.0.1"
+          "iter.loop 1"
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+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_4.0.1.1"
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+      "child_4.1.0"
+        "child_4.1.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_4.1.0.1"
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+      "child_4.1.1"
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+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_4.1.1.1"
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+        "child_4.2.0.0"
+          "iter.loop 1"
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+          "iter.loop 3"
+          "iter.loop 4"
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+          "iter.loop 1"
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+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_4.2.1.1"
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+      "child_4.3.0"
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+          "iter.loop 1"
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+          "iter.loop 3"
+          "iter.loop 4"
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+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_4.3.1.1"
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+      "child_4.4.0"
+        "child_4.4.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_4.4.0.1"
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+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_4.4.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
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+        "iter.loop 06"
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+      "child_5.0.0"
+        "child_5.0.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_5.0.0.1"
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+          "iter.loop 1"
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+          "iter.loop 3"
+          "iter.loop 4"
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+      "child_5.1.0"
+        "child_5.1.0.0"
+          "iter.loop 1"
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+          "iter.loop 3"
+          "iter.loop 4"
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+        "child_5.1.0.1"
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+          "iter.loop 3"
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+          "iter.loop 1"
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+          "iter.loop 4"
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+          "iter.loop 1"
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+          "iter.loop 4"
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+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_6.1.1"
+        "child_6.1.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_6.1.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.6.2"
+      "child.6.2.99.await_children"
+      "child_6.2.0"
+        "child_6.2.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_6.2.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_6.2.1"
+        "child_6.2.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_6.2.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.6.3"
+      "child.6.3.99.await_children"
+      "child_6.3.0"
+        "child_6.3.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_6.3.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_6.3.1"
+        "child_6.3.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_6.3.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.6.4"
+      "child.6.4.99.await_children"
+      "child_6.4.0"
+        "child_6.4.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_6.4.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_6.4.1"
+        "child_6.4.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_6.4.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+  "top_7"
+    "child.7.0"
+      "child.7.0.99.await_children"
+      "child_7.0.0"
+        "child_7.0.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.0.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_7.0.1"
+        "child_7.0.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.0.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.7.1"
+      "child.7.1.99.await_children"
+      "child_7.1.0"
+        "child_7.1.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.1.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_7.1.1"
+        "child_7.1.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.1.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.7.2"
+      "child.7.2.99.await_children"
+      "child_7.2.0"
+        "child_7.2.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.2.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_7.2.1"
+        "child_7.2.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.2.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.7.3"
+      "child.7.3.99.await_children"
+      "child_7.3.0"
+        "child_7.3.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.3.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_7.3.1"
+        "child_7.3.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.3.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+    "child.7.4"
+      "child.7.4.99.await_children"
+      "child_7.4.0"
+        "child_7.4.0.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.4.0.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+      "child_7.4.1"
+        "child_7.4.1.0"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "child_7.4.1.1"
+          "iter.loop 1"
+          "iter.loop 2"
+          "iter.loop 3"
+          "iter.loop 4"
+          "iter.loop 5"
+        "iter.loop 01"
+        "iter.loop 02"
+        "iter.loop 03"
+        "iter.loop 04"
+        "iter.loop 05"
+        "iter.loop 06"
+        "iter.loop 07"
+        "iter.loop 08"
+        "iter.loop 09"
+        "iter.loop 10"
+done
+run test on pool = ws_pool
 tracing complete
 spans:
   "top_0"
diff --git a/test/fiber/t_fls.ml b/test/fiber/t_fls.ml
index 57ec3df5..3c3ae8fd 100644
--- a/test/fiber/t_fls.ml
+++ b/test/fiber/t_fls.ml
@@ -95,7 +95,7 @@ module Render = struct
     List.iter (pp_tree 2 oc) self.roots
 end
 
-let () =
+let run ~pool ~pool_name () =
   let tracer = Tracer.create () in
 
   let sub_sub_child ~idx ~idx_child ~idx_sub ~idx_sub_sub () =
@@ -155,8 +155,7 @@ let () =
     List.iter F.await subs
   in
 
-  let@ pool = Ws_pool.with_ () in
-
+  Printf.printf "run test on pool = %s\n" pool_name;
   let fibs =
     List.init 8 (fun idx -> F.spawn_top ~on:pool (fun () -> top idx))
   in
@@ -168,3 +167,11 @@ let () =
   Render.pp stdout tree;
   Printf.printf "done\n%!";
   ()
+
+let () =
+  (let@ pool = Ws_pool.with_ () in
+   run ~pool ~pool_name:"ws_pool" ());
+
+  (let@ pool = Fifo_pool.with_ () in
+   run ~pool ~pool_name:"ws_pool" ());
+  ()