From c509c612e186ab7da64ac629c941b8de01ce5dd2 Mon Sep 17 00:00:00 2001
From: Ben Visness <ben@bvisness.me>
Date: Sun, 2 Jul 2023 07:09:39 -0500
Subject: [PATCH] Add dtrace + spall script

---
 samples/pong/.gitignore |  3 +++
 samples/pong/trace.sh   | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 samples/pong/.gitignore
 create mode 100755 samples/pong/trace.sh

diff --git a/samples/pong/.gitignore b/samples/pong/.gitignore
new file mode 100644
index 0000000..def138d
--- /dev/null
+++ b/samples/pong/.gitignore
@@ -0,0 +1,3 @@
+profile.dtrace
+profile.spall
+
diff --git a/samples/pong/trace.sh b/samples/pong/trace.sh
new file mode 100755
index 0000000..48186aa
--- /dev/null
+++ b/samples/pong/trace.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# You will need dtrace2spall installed:
+#
+#   go install github.com/bvisness/dtrace2spall@latest
+#
+# You will also need `$(go env GOPATH)/bin` on your PATH.
+
+# Run DTrace and save to profile.dtrace
+sudo dtrace -n 'profile-997 /pid == $target/ { @[timestamp, pid, tid, ustack(100)] = count(); }' \
+    -x ustackframes=100 \
+    -o profile.dtrace \
+    -x aggsortkey -x aggsortkeypos=0 \
+    -c ./Pong.app/Contents/MacOS/orca
+# Convert to Spall and save to profile.spall
+cat profile.dtrace | dtrace2spall --freq 997 -o profile.spall --fields=_,pid,tid