Benchmark importing all standard library modules

Note this will change if we add or remove modules from the standard
library. We could alternatively hardcode a list of standard library
modules.

Author: hauntsaninja

pyperformance/data-files/benchmarks/MANIFEST

@@ -81,6 +81,7 @@ sqlglot_parse	<local:sqlglot>
 sqlglot_transpile	<local:sqlglot>
 sqlglot_optimize	<local:sqlglot>
 sqlite_synth	<local>
+stdlib_startup	<local>
 sympy	<local>
 telco	<local>
 tomli_loads	<local>

pyperformance/data-files/benchmarks/bm_stdlib_startup/pyproject.toml

@@ -0,0 +1,10 @@
+[project]
+name = "pyperformance_stdlib_startup"
+requires-python = ">=3.8"
+dependencies = []
+urls = {repository = "https://github.com/python/pyperformance"}
+dynamic = ["version"]
+
+[tool.pyperformance]
+name = "stdlib_startup"
+tags = "startup"

pyperformance/data-files/benchmarks/bm_stdlib_startup/requirements.txt

@@ -0,0 +1,29 @@
+import os
+import sys
+import subprocess
+import tempfile
+
+import pyperf
+
+if __name__ == "__main__":
+    runner = pyperf.Runner(values=10)
+
+    runner.metadata['description'] = "Performance of importing standard library modules"
+    args = runner.parse_args()
+
+    with tempfile.TemporaryDirectory() as tmp:
+        main = os.path.join(tmp, "main.py")
+        with open(main, "w") as f:
+            f.write("""
+import importlib
+import sys
+for m in sys.stdlib_module_names:
+    if m in {"antigravity", "this"}:
+        continue
+    try:
+        importlib.import_module(m)
+    except ImportError:
+        pass
+""")
+        command = [sys.executable, main]
+        runner.bench_command('stdlib_startup', command)