chore: add benchmarks (#459)

* chore: add benchmarks for tier 1 languages

* improve fixtures

* fix cargo fmt

benchmark/python/bench.py

@@ -0,0 +1,39 @@
+import json
+import os
+import sys
+import time
+
+import zen
+
+root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+fixtures = os.path.join(root, "fixtures")
+manifest = json.load(open(os.path.join(root, "manifest.json")))
+iters = int(os.environ.get("BENCH_ITERS", "2000"))
+out_path = sys.argv[1] if len(sys.argv) > 1 else None
+
+
+def loader(key):
+    with open(os.path.join(fixtures, key)) as f:
+        return f.read()
+
+
+engine = zen.ZenEngine({"loader": loader})
+
+results = []
+for e in manifest:
+    for trace in (False, True):
+        opts = {"trace": trace}
+        engine.evaluate(e["file"], e["input"], opts)
+        start = time.perf_counter_ns()
+        for _ in range(iters):
+            engine.evaluate(e["file"], e["input"], opts)
+        per = (time.perf_counter_ns() - start) / iters
+        suffix = " +trace" if trace else ""
+        results.append({"name": f'{e["name"]} ({e["kind"]}){suffix}', "unit": "ns/op", "value": per})
+
+if out_path:
+    with open(out_path, "w") as f:
+        f.write(json.dumps(results, indent=2))
+else:
+    for r in results:
+        print(f'{r["name"]:<44} {r["value"]:>12.0f} ns/op')