Add a script for testing organic parse times.

This is not meant to produce publishable or comparable benchmarks. Such a script would have to run many iterations with the input already loaded into memory, proper prioritization via nice/ionice, and have a warm-up phase. This is just automating a basic test I am frequently running to compare parse times when investigating performance issues.

Cargo.toml

@@ -44,11 +44,13 @@ default = ["compare"]
 compare = []
 tracing = ["dep:opentelemetry", "dep:opentelemetry-otlp", "dep:opentelemetry-semantic-conventions", "dep:tokio", "dep:tracing", "dep:tracing-opentelemetry", "dep:tracing-subscriber"]
 
+# Optimized build for any sort of release.
 [profile.release-lto]
 inherits = "release"
 lto = true
 strip = "symbols"
 
+# Profile for performance testing with the "perf" tool. Notably keeps debug enabled and does not strip symbols to make reading the perf output easier.
 [profile.perf]
 inherits = "release"
 lto = true

scripts/time_parse.bash

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+#
+# Time running a single parse without invoking a compare with emacs.
+set -euo pipefail
+IFS=$'\n\t'
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+: ${PROFILE:="release-lto"}
+
+cd "$DIR/../"
+
+function main {
+    local additional_flags=()
+    if [ "$PROFILE" = "dev" ] || [ "$PROFILE" = "debug" ]; then
+        PROFILE="debug"
+    else
+        additional_flags+=(--profile "$PROFILE")
+    fi
+    cargo build --no-default-features "${additional_flags[@]}"
+    time ./target/${PROFILE}/compare
+}
+
+main "${@}"