Add a basic venv benchmark (#853)

scripts/benchmarks/venv.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+###
+# Benchmark the virtualenv initialization against `virtualenv`.
+#
+# Example usage:
+#
+#   ./scripts/benchmarks/venv.sh ./scripts/benchmarks/requirements.txt
+###
+
+set -euxo pipefail
+
+###
+# Create a virtual environment without seed packages.
+###
+hyperfine --runs 20 --warmup 3 \
+    --prepare "rm -rf .venv" \
+    "./target/release/puffin venv --no-cache" \
+    --prepare "rm -rf .venv" \
+    "virtualenv --without-pip .venv" \
+    --prepare "rm -rf .venv" \
+    "python -m venv --without-pip .venv"
+
+###
+# Create a virtual environment with seed packages.
+#
+# TODO(charlie): Support seed packages in `puffin venv`.
+###
+hyperfine --runs 20 --warmup 3 \
+    --prepare "rm -rf .venv" \
+    "virtualenv .venv" \
+    --prepare "rm -rf .venv" \
+    "python -m venv .venv"