bpo-46072: Document --enable-stats option. (GH-30139)

Tools/scripts/summarize_stats.py

@@ -0,0 +1,53 @@
+"""Print a summary of specialization stats for all files in the
+default stats folders.
+"""
+
+import collections
+import os.path
+
+if os.name == "nt":
+    DEFAULT_DIR = "c:\\temp\\py_stats\\"
+else:
+    DEFAULT_DIR = "/tmp/py_stats/"
+
+
+TOTAL = "deferred", "hit", "miss", "unquickened"
+
+def print_stats(name, family_stats):
+    total = sum(family_stats[kind] for kind in TOTAL)
+    if total == 0:
+        return
+    print(name+":")
+    for key in sorted(family_stats):
+        if not key.startswith("specialization"):
+            print(f"{key:>12}:{family_stats[key]:>12} {100*family_stats[key]/total:0.1f}%")
+    for key in ("specialization_success",  "specialization_failure"):
+        print(f"  {key}:{family_stats[key]:>12}")
+    total_failures = family_stats["specialization_failure"]
+    failure_kinds = [ 0 ] * 30
+    for key in family_stats:
+        if not key.startswith("specialization_failure_kind"):
+            continue
+        _, index = key[:-1].split("[")
+        index =  int(index)
+        failure_kinds[index] = family_stats[key]
+    for index, value in enumerate(failure_kinds):
+        if not value:
+            continue
+        print(f"    kind {index:>2}: {value:>8} {100*value/total_failures:0.1f}%")
+
+def main():
+    stats = collections.defaultdict(collections.Counter)
+    for filename in os.listdir(DEFAULT_DIR):
+        for line in open(os.path.join(DEFAULT_DIR, filename)):
+            key, value = line.split(":")
+            key = key.strip()
+            family, stat = key.split(".")
+            value = int(value.strip())
+            stats[family][stat] += value
+
+    for name in sorted(stats):
+        print_stats(name, stats[name])
+
+if __name__ == "__main__":
+    main()