Benchmarks thread

[bigcat88]

After this issue #53 and as this project comes closer to final stage, wrote small tests, and will post them here for now.

Hardware: mac Mini M1 and Intel 10900k.
When benchmarking version 0.9.0 I set default number of decode threads to 8(for clarity), other versions do not support this parameter, but libheif defaults it to 4.

There was a bug in libheif, when it was compiled with Cmake it had turned off multithreading and was working in single threaded mode. That was fixed in new upcoming release and you can see it on graphs(0.5.1 for Linux has no this bug, 0.6.0 has).

Temporary code that was written today:

import sys
from subprocess import run
from time import perf_counter


def measure_decode(image, n_iterations):
    cmd = f"{sys.executable} {__file__} {n_iterations} {image}".split()
    start_time = perf_counter()
    run(cmd, check=True)
    total_time = perf_counter() - start_time
    return total_time / n_iterations


if __name__ == "__main__":
    from PIL import Image
    from pillow_heif import register_heif_opener, __version__


    _args = {}
    if __version__ != "0.1.6":
        _args["decode_threads"] = 8
    register_heif_opener(**_args)
    for i in range(int(sys.argv[1])):
        im = Image.open(sys.argv[2])
        im.load()
    sys.exit(0)

Two test images was taken from that issue and from this repo i took cat.hif (HDR image, with 2 thumbnails)

Image decode results

[bigcat88]

benchmarks link