[hawk_]

If you tested this on macos, be careful. The fsync on it lies.

[Palomides]

nope, linux python script that writes a little data and calls os.fsync

[ncruces]

What's a little data?

In many situations, fsync flushes everything, including totally uncorrelated stuff that might be running on your system.

[packetlost]

fsync on most OSes lie to some degree