Fix timeit latency

Author: ijl

README.md

@@ -263,14 +263,14 @@ dataclasses, those with optional or default attributes, and subclasses.
 
 | Library    | dict (ms)   | dataclass (ms)   | vs. orjson   |
 |------------|-------------|------------------|--------------|
-| orjson     | 0.10        | 0.19             | 1            |
+| orjson     | 1.80        | 2.87             | 1            |
 | ujson      |             |                  |              |
-| rapidjson  | 0.24        | 6.48             | 33           |
-| simplejson | 1.06        | 7.94             | 40           |
-| json       | 0.92        | 7.32             | 37           |
+| rapidjson  | 4.23        | 91.79            | 31           |
+| simplejson | 19.26       | 113.70           | 39           |
+| json       | 14.37       | 107.38           | 37           |
 
-This measures orjson serializing instances natively and other libraries using
-`default` to serialize the output of `dataclasses.asdict()`. This can be
+This measures serializing 555KiB of JSON, orjson natively and other libraries
+using `default` to serialize the output of `dataclasses.asdict()`. This can be
 reproduced using the `pydataclass` script.
 
 Dataclasses are serialized as maps, with every attribute serialized and in

pydataclass

@@ -17,9 +17,6 @@ from tabulate import tabulate
 os.sched_setaffinity(os.getpid(), {0, 1})
 
 
-buf = io.StringIO()
-
-
 @dataclasses.dataclass
 class Member:
     id: int
@@ -35,11 +32,15 @@ class Object:
 
 objects_as_dataclass = [
     Object(i, str(i) * 3, [Member(j, True) for j in range(0, 10)])
-    for i in range(100000, 101000)
+    for i in range(100000, 102000)
 ]
 
 objects_as_dict = [dataclasses.asdict(each) for each in objects_as_dataclass]
 
+output_in_kib = len(orjson.dumps(objects_as_dict)) / 1024
+
+print(f"{output_in_kib:,.0f}KiB output (orjson)")
+
 
 def default(__obj):
     if dataclasses.is_dataclass(__obj):
@@ -52,6 +53,13 @@ LIBRARIES = ("orjson", "ujson", "rapidjson", "simplejson", "json")
 
 ITERATIONS = 100
 
+
+def per_iter_latency(val):
+    if val is None:
+        return None
+    return (val * 1000) / ITERATIONS
+
+
 table = []
 for lib_name in LIBRARIES:
     if lib_name == "json":
@@ -96,10 +104,13 @@ for lib_name in LIBRARIES:
             ),
             number=ITERATIONS,
         )
-        orjson_as_dataclass = as_dataclass
+        orjson_as_dataclass = per_iter_latency(as_dataclass)
     else:
         raise NotImplementedError
 
+    as_dict = per_iter_latency(as_dict)
+    as_dataclass = per_iter_latency(as_dataclass)
+
     if lib_name == "orjson":
         compared_to_orjson = 1
     elif as_dict:
@@ -115,6 +126,8 @@ for lib_name in LIBRARIES:
             f"{compared_to_orjson:d}" if compared_to_orjson else "",
         )
     )
+
+buf = io.StringIO()
 buf.write(tabulate(table, headers, tablefmt="grid") + "\n")
 
 print(