Add benchmark for import time

Author: gudnimg

jsonschema/benchmarks/import_benchmark.py

@@ -0,0 +1,31 @@
+"""
+A benchmark which measures the import time of jsonschema
+"""
+
+import subprocess
+import sys
+
+
+def import_time(loops):
+    total_us = 0
+    for _ in range(loops):
+        p = subprocess.run(  # noqa: S603 (arguments are static)
+            [sys.executable, "-X", "importtime", "-c", "import jsonschema"],
+            stderr=subprocess.PIPE,
+            stdout=subprocess.DEVNULL,
+            check=True,
+        )
+
+        line = p.stderr.splitlines()[-1]
+        field = line.split(b"|")[-2].strip()
+        us = int(field)  # microseconds
+        total_us += us
+
+    # pyperf expects seconds
+    return total_us / 1_000_000.0
+
+if __name__ == "__main__":
+    from pyperf import Runner
+    runner = Runner()
+
+    runner.bench_time_func("Import time (cumulative)", import_time)