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from __future__ import annotations
import sys
import dataclasses
import json
import timeit
import importlib.metadata
from typing import Any, Literal, Callable
from .generate_data import make_filesystem_data
import msgspec
class File(msgspec.Struct, kw_only=True, omit_defaults=True, tag="file"):
name: str
created_by: str
created_at: str
updated_by: str | None = None
updated_at: str | None = None
nbytes: int
permissions: Literal["READ", "WRITE", "READ_WRITE"]
class Directory(msgspec.Struct, kw_only=True, omit_defaults=True, tag="directory"):
name: str
created_by: str
created_at: str
updated_by: str | None = None
updated_at: str | None = None
contents: list[File | Directory]
@dataclasses.dataclass
class Benchmark:
label: str
version: str
encode: Callable
decode: Callable
schema: Any = None
def run(self, data: bytes) -> dict:
if self.schema is not None:
data = msgspec.convert(data, self.schema)
timer = timeit.Timer("func(data)", globals={"func": self.encode, "data": data})
n, t = timer.autorange()
encode_time = t / n
data = self.encode(data)
timer = timeit.Timer("func(data)", globals={"func": self.decode, "data": data})
n, t = timer.autorange()
decode_time = t / n
return {
"label": self.label,
"encode": encode_time,
"decode": decode_time,
}
def json_benchmarks():
import orjson
import ujson
import rapidjson
import simdjson
simdjson_ver = importlib.metadata.version("pysimdjson")
rj_dumps = rapidjson.Encoder()
rj_loads = rapidjson.Decoder()
def uj_dumps(obj):
return ujson.dumps(obj)
enc = msgspec.json.Encoder()
dec = msgspec.json.Decoder(Directory)
dec2 = msgspec.json.Decoder()
return [
Benchmark("msgspec structs", None, enc.encode, dec.decode, Directory),
Benchmark("msgspec", msgspec.__version__, enc.encode, dec2.decode),
Benchmark("json", None, json.dumps, json.loads),
Benchmark("orjson", orjson.__version__, orjson.dumps, orjson.loads),
Benchmark("ujson", ujson.__version__, uj_dumps, ujson.loads),
Benchmark("rapidjson", rapidjson.__version__, rj_dumps, rj_loads),
Benchmark("simdjson", simdjson_ver, simdjson.dumps, simdjson.loads),
]
def msgpack_benchmarks():
import msgpack
import ormsgpack
enc = msgspec.msgpack.Encoder()
dec = msgspec.msgpack.Decoder(Directory)
dec2 = msgspec.msgpack.Decoder()
return [
Benchmark("msgspec structs", None, enc.encode, dec.decode, Directory),
Benchmark("msgspec", msgspec.__version__, enc.encode, dec2.decode),
Benchmark("msgpack", msgpack.__version__, msgpack.dumps, msgpack.loads),
Benchmark(
"ormsgpack", ormsgpack.__version__, ormsgpack.packb, ormsgpack.unpackb
),
]
def main():
import argparse
parser = argparse.ArgumentParser(
description="Benchmark different python serialization libraries"
)
parser.add_argument(
"--versions",
action="store_true",
help="Output library version info, and exit immediately",
)
parser.add_argument(
"-n",
type=int,
help="The number of objects in the generated data, defaults to 1000",
default=1000,
)
parser.add_argument(
"-p",
"--protocol",
choices=["json", "msgpack"],
default="json",
help="The protocol to benchmark, defaults to JSON",
)
parser.add_argument(
"--json",
action="store_true",
help="whether to output the results as json",
)
args = parser.parse_args()
benchmarks = json_benchmarks() if args.protocol == "json" else msgpack_benchmarks()
if args.versions:
for bench in benchmarks:
if bench.version is not None:
print(f"- {bench.label}: {bench.version}")
sys.exit(0)
data = make_filesystem_data(args.n)
results = [benchmark.run(data) for benchmark in benchmarks]
if args.json:
for line in results:
print(json.dumps(line))
else:
# Compose the results table
results.sort(key=lambda row: row["encode"] + row["decode"])
best_et = results[0]["encode"]
best_dt = results[0]["decode"]
best_tt = best_et + best_dt
columns = (
"",
"encode (μs)",
"vs.",
"decode (μs)",
"vs.",
"total (μs)",
"vs.",
)
rows = [
(
r["label"],
f"{1_000_000 * r['encode']:.1f}",
f"{r['encode'] / best_et:.1f}",
f"{1_000_000 * r['decode']:.1f}",
f"{r['decode'] / best_dt:.1f}",
f"{1_000_000 * (r['encode'] + r['decode']):.1f}",
f"{(r['encode'] + r['decode']) / best_tt:.1f}",
)
for r in results
]
widths = tuple(
max(max(map(len, x)), len(c)) for x, c in zip(zip(*rows), columns)
)
row_template = ("|" + (" %%-%ds |" * len(columns))) % widths
header = row_template % tuple(columns)
bar_underline = "+%s+" % "+".join("=" * (w + 2) for w in widths)
bar = "+%s+" % "+".join("-" * (w + 2) for w in widths)
parts = [bar, header, bar_underline]
for r in rows:
parts.append(row_template % r)
parts.append(bar)
print("\n".join(parts))
if __name__ == "__main__":
main()
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