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"""
Prints a comparison between different serializers.
Compares results based on size of the output, and time taken to (de)serialize.
"""
from timeit import default_timer as perf_timer
import sys
import datetime
import decimal
import uuid
class Person(object):
def __init__(self, name, age):
self.name = name
self.age = age
guid = uuid.uuid4()
data = {
"bytes": bytes(x for x in range(256)) * 300,
"bytearray": bytearray(x for x in range(256)) * 300,
"str": "\"0123456789\"\n'abcdefghijklmnopqrstuvwxyz'\t" * 2000,
"unicode": u"abcdefghijklmnopqrstuvwxyz\u20ac\u20ac\u20ac\u20ac\u20ac" * 2000,
"int": [123456789] * 1000,
"double": [12345.987654321] * 1000,
"long": [123456789123456789123456789123456789] * 1000,
"tuple": [(x * x, "tuple", (300, 400, (500, 600, (x * x, x * x)))) for x in range(200)],
"list": [[x * x, "list", [300, 400, [500, 600, [x * x]]]] for x in range(200)],
"set": set(x * x for x in range(1000)),
"dict": {str(i * i): {str(1000 + j): chr(j + 65) for j in range(5)} for i in range(100)},
"exception": [ZeroDivisionError("test exeception", x * x) for x in range(1000)],
"class": [Person("harry", x * x) for x in range(1000)],
"datetime": [datetime.datetime.now() for x in range(1000)],
"complex": [complex(x + x, x * x) for x in range(1000)],
"decimal": [decimal.Decimal("1122334455667788998877665544332211.9876543212345678987654321123456789") for x in range(1000)],
"uuid": [guid for x in range(1000)]
}
serializers = {}
try:
import pickle
serializers["pickle"] = (pickle.dumps, pickle.loads)
except ImportError:
pass
try:
import cPickle
serializers["cpickle"] = (cPickle.dumps, cPickle.loads)
except ImportError:
pass
import json
serializers["json"] = (lambda d: json.dumps(d).encode("utf-8"), lambda d: json.loads(d.decode("utf-8")))
import serpent
serializers["serpent"] = (serpent.dumps, serpent.loads)
import marshal
serializers["marshal"] = (marshal.dumps, marshal.loads)
try:
import msgpack
serializers["msgpack"] = (lambda d: msgpack.packb(d, use_bin_type=True), lambda d: msgpack.unpackb(d))
except ImportError:
pass
try:
import xmlrpclib as xmlrpc
except ImportError:
import xmlrpc.client as xmlrpc
def xmldumps(data):
return xmlrpc.dumps((data,)).encode("utf-8")
def xmlloads(data):
return xmlrpc.loads(data.decode("utf-8"))[0]
serializers["xmlrpc"] = (xmldumps, xmlloads)
no_result = 9999999999
def run():
results = {}
number = 10
repeat = 3
for ser in serializers:
print("serializer:", ser)
results[ser] = {"sizes": {}, "ser-times": {}, "deser-times": {}}
for key in sorted(data):
print(key, end="; ")
sys.stdout.flush()
try:
serialized = serializers[ser][0](data[key])
except (TypeError, ValueError, OverflowError):
print("error!")
results[ser]["sizes"][key] = no_result
results[ser]["ser-times"][key] = no_result
results[ser]["deser-times"][key] = no_result
else:
results[ser]["sizes"][key] = len(serialized)
durations_ser = []
durations_deser = []
serializer, deserializer = serializers[ser]
serialized_data = serializer(data[key])
for _ in range(repeat):
start = perf_timer()
for _ in range(number):
serializer(data[key])
durations_ser.append(perf_timer() - start)
for _ in range(repeat):
start = perf_timer()
for _ in range(number):
deserialized_data = deserializer(serialized_data)
if type(deserialized_data) is dict:
encoding = deserialized_data.get("encoding")
if encoding=="base64":
deserialized_data = serpent.tobytes(deserialized_data)
durations_deser.append(perf_timer() - start)
duration_ser = min(durations_ser)
duration_deser = min(durations_deser)
results[ser]["ser-times"][key] = round(duration_ser * 1e6 / number, 2)
results[ser]["deser-times"][key] = round(duration_deser * 1e6 / number, 2)
print()
return results
def tables_size(results):
print("\nSIZE RESULTS\n")
sizes_per_datatype = {}
for ser in results:
for datatype in results[ser]["sizes"]:
size = results[ser]["sizes"][datatype]
if datatype not in sizes_per_datatype:
sizes_per_datatype[datatype] = []
sizes_per_datatype[datatype].append((size, ser))
sizes_per_datatype = {datatype: sorted(sizes) for datatype, sizes in sizes_per_datatype.items()}
for dt in sorted(sizes_per_datatype):
print(dt)
for pos, (size, serializer) in enumerate(sizes_per_datatype[dt]):
if size == no_result:
size = "unsupported"
else:
size = "%8d" % size
print(" %2d: %-8s %s" % (pos + 1, serializer, size))
print()
def tables_speed(results, what_times, header):
print("\n%s\n" % header)
durations_per_datatype = {}
for ser in results:
for datatype in results[ser]["sizes"]:
duration = results[ser][what_times][datatype]
if datatype not in durations_per_datatype:
durations_per_datatype[datatype] = []
durations_per_datatype[datatype].append((duration, ser))
durations_per_datatype = {datatype: sorted(durations) for datatype, durations in durations_per_datatype.items()}
for dt in sorted(durations_per_datatype):
print(dt)
for pos, (duration, serializer) in enumerate(durations_per_datatype[dt]):
if duration == no_result:
duration = "unsupported"
else:
duration = "%8d" % duration
print(" %2d: %-8s %s" % (pos + 1, serializer, duration))
print()
if __name__ == "__main__":
results = run()
tables_size(results)
tables_speed(results, "ser-times", "SPEED RESULTS (SERIALIZATION)")
tables_speed(results, "deser-times", "SPEED RESULTS (DESERIALIZATION)")
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