diff --git a/findr.odin b/findr.odin
index cd5db19..e32581a 100644
--- a/findr.odin
+++ b/findr.odin
@@ -6,6 +6,9 @@ import "core:os"
 import "core:strings"
 
 main :: proc() {
+	prof_init()
+	defer prof_destroy()
+
 	args := os.args
 
 	opts: WalkOptions
diff --git a/prof.odin b/prof.odin
new file mode 100644
index 0000000..899f68d
--- /dev/null
+++ b/prof.odin
@@ -0,0 +1,64 @@
+package findr
+
+import "base:runtime"
+import "core:prof/spall"
+import "core:sync"
+
+SPALL_ENABLED :: #config(SPALL_ENABLED, ODIN_DEBUG)
+
+spall_ctx: spall.Context
+
+@(thread_local) spall_buffer: spall.Buffer
+@(thread_local) spall_backing: []u8
+
+@(instrumentation_enter)
+spall_enter :: proc "contextless" (
+	proc_address, call_site_return_address: rawptr,
+	loc: runtime.Source_Code_Location,
+) {
+	when SPALL_ENABLED {
+		spall._buffer_begin(&spall_ctx, &spall_buffer, "", "", loc)
+	}
+}
+
+@(instrumentation_exit)
+spall_exit :: proc "contextless" (
+	proc_address, call_site_return_address: rawptr,
+	loc: runtime.Source_Code_Location,
+) {
+	when SPALL_ENABLED {
+		spall._buffer_end(&spall_ctx, &spall_buffer)
+	}
+}
+
+prof_init :: proc() {
+	when SPALL_ENABLED {
+		spall_ctx = spall.context_create_with_scale("findr.spall", false, 1.0)
+		spall_backing = make([]u8, spall.BUFFER_DEFAULT_SIZE)
+		spall_buffer = spall.buffer_create(spall_backing, u32(sync.current_thread_id()))
+		spall._buffer_name_thread(&spall_ctx, &spall_buffer, "main")
+	}
+}
+
+prof_destroy :: proc() {
+	when SPALL_ENABLED {
+		spall.buffer_destroy(&spall_ctx, &spall_buffer)
+		delete(spall_backing)
+		spall.context_destroy(&spall_ctx)
+	}
+}
+
+prof_thread_init :: proc(name: string) {
+	when SPALL_ENABLED {
+		spall_backing = make([]u8, spall.BUFFER_DEFAULT_SIZE)
+		spall_buffer = spall.buffer_create(spall_backing, u32(sync.current_thread_id()))
+		spall._buffer_name_thread(&spall_ctx, &spall_buffer, name)
+	}
+}
+
+prof_thread_destroy :: proc() {
+	when SPALL_ENABLED {
+		spall.buffer_destroy(&spall_ctx, &spall_buffer)
+		delete(spall_backing)
+	}
+}
diff --git a/profile.sh b/profile.sh
new file mode 100755
index 0000000..57b2030
--- /dev/null
+++ b/profile.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+DIR="$(cd "$(dirname "$0")" && pwd)"
+
+echo "Building findr-prof..."
+odin build "$DIR" -debug -out:"$DIR/findr-prof"
+
+echo "Running profiler..."
+"$DIR/findr-prof" -E .git -E .jj -HI ~/git.verticalaxion.com
+
+echo
+echo "Spall trace: $DIR/findr.spall"
diff --git a/walker.odin b/walker.odin
index 4fcbca6..3cc3a3a 100644
--- a/walker.odin
+++ b/walker.odin
@@ -145,6 +145,9 @@ walk :: proc(roots: []string, results: ^[dynamic]string, opts: WalkOptions, thre
 walk_worker :: proc(t: ^thread.Thread) {
 	pool := cast(^WalkerPool)t.data
 
+	prof_thread_init("walker")
+	defer prof_thread_destroy()
+
 	local_results := make([dynamic]string, 0, 256)
 	defer delete(local_results)