Benchmarks

[danielhrisca]

Hello,

Do you have some comparison numbers against the Python-can default bus?

[zariiii9003]

I made a little script back then. I'm not sure how reliable these numbers are, but here you are:

import sys
import timeit


setup_0 = r"""
import random

from can import Message, Bus

FD = True
LEN = 64 if FD else 8
MSG = Message(
    arbitration_id=100, 
    is_fd=FD, 
    data=[random.randint(0, 255) for _ in range(LEN)], 
    dlc=LEN,
)
"""

setup_1 = setup_0 + r"""
bus = Bus(
    interface="vector",
    serial=100,
    channel=1,
    fd=FD,
    receive_own_messages=True
)
bus.send(MSG)
"""

setup_2 = setup_0 + r"""
bus = Bus(
    interface="cvector",
    serial=100,
    channel=1,
    fd=FD,
    receive_own_messages=True
)
bus.send(MSG)
"""

send_and_receive = r"""
bus.send(MSG)
bus.recv()
"""

send_only = r"""
bus.send(MSG)
"""


reps = 3
loops = 10000

print(sys.version)
python_can = min(timeit.Timer(send_and_receive, setup=setup_1).repeat(reps, loops))
cython_can = min(timeit.Timer(send_and_receive, setup=setup_2).repeat(reps, loops))
print(f"send & receive: {python_can=}s, {cython_can}s, {python_can / cython_can:.2f}")

python_can = min(timeit.Timer(send_only, setup=setup_1).repeat(reps, loops))
cython_can = min(timeit.Timer(send_only, setup=setup_2).repeat(reps, loops))
print(f"send only: {python_can=}s, {cython_can}s, {python_can / cython_can:.2f}")

Which prints

3.10.9 (tags/v3.10.9:1dd9be6, Dec  6 2022, 20:01:21) [MSC v.1934 64 bit (AMD64)]
send & receive: python_can=0.2280426000006628s, 0.03325200000017503s, 6.86
send only: python_can=0.12258299999939481s, 0.021391100000073493s, 5.73

So roughly factor 6 with the virtual bus.