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import argparse
import time
import typing
from ._crc32c import crc32c
DEFAULT_SIZE = 100 * 1024 * 1024
DEFAULT_ITERATIONS = 10
def run(size: int, iterations: int) -> typing.Tuple[float, int]:
data = b" " * size
start = time.monotonic()
evaluations = 0
while True:
evaluations += iterations
[crc32c(data) for _ in range(iterations)]
duration = time.monotonic() - start
if duration > 0:
break
return duration, evaluations
def main() -> None:
parser = argparse.ArgumentParser()
parser.add_argument(
"-s",
"--size",
type=int,
help=f"Amount of bytes to checksum, defaults to {DEFAULT_SIZE}",
default=DEFAULT_SIZE,
)
parser.add_argument(
"-i",
"--iterations",
type=int,
help=f"Number of times the checksum should we run over the data, defaults to {DEFAULT_ITERATIONS}",
default=DEFAULT_ITERATIONS,
)
options = parser.parse_args()
duration, evaluations = run(options.size, options.iterations)
size_mb = options.size / 1024 / 1024
avg_speed_gbs = size_mb / 1024 * evaluations / duration
print(
f"crc32c ran at {avg_speed_gbs:.3f} [GB/s] when checksuming {size_mb:.3f} [MB] {evaluations} times"
)
if __name__ == "__main__":
main()