From 560b481f8edd11aaa012204e4798b9d549df685e Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Sun, 10 Oct 2021 14:09:46 +0300
Subject: perf: add script to run a simplistic benchmark

Sponsored-by: author
---
 bench.sh | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100755 bench.sh

diff --git a/bench.sh b/bench.sh
new file mode 100755
index 0000000..75cd459
--- /dev/null
+++ b/bench.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+#
+# Run a simple benchmark of an initial backup of a sparse file of a
+# given size. This mainly measures how fast the client can split the
+# live data into chunks and compute checksums for the chunks.
+#
+# Edit the if-statement towards the end to get a flamegraph to see
+# where time is actually spent.
+#
+# This is very simplistic and could do with a lot of improvement. But it's a start.
+
+set -euo pipefail
+
+SIZE=1G
+
+TMP="$(mktemp -d)"
+trap 'rm -rf "$TMP"' EXIT
+
+chunks="$TMP/chunks"
+live="$TMP/live"
+
+mkdir "$chunks"
+mkdir "$live"
+truncate --size "$SIZE" "$live/data.dat"
+
+cat <<EOF >"$TMP/server.yaml"
+address: localhost:8888
+chunks: $chunks
+tls_key: test.key
+tls_cert: test.pem
+EOF
+
+cat <<EOF >"$TMP/client.yaml"
+server_url: https://localhost:8888
+verify_tls_cert: false
+roots:
+  - $live
+log: $TMP/client.log
+EOF
+
+cargo build -q --release --all-targets
+
+OBNAM_SERVER_LOG=error cargo run -q --release --bin obnam-server -- "$TMP/server.yaml" >/dev/null &
+pid="$!"
+
+cargo run -q --release --bin obnam -- --config "$TMP/client.yaml" init --insecure-passphrase=hunter2
+if true; then
+	/usr/bin/time cargo run -q --release --bin obnam -- --config "$TMP/client.yaml" backup >/dev/null
+else
+	cargo flamegraph --bin obnam -o obnam.svg -- --config "$TMP/client.yaml" backup >/dev/null
+fi
+
+kill -9 "$pid"
-- 
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