fsync has been broken since it was introduced in BSD4.x. It's never worked well, usually flushing the whole machine cache in one huge batch of i/o. I'm told

fsync has been broken since it was introduced in BSD4.x. It's never worked well, usually flushing the whole machine cache in one huge batch of i/o. I'm told current versions on Linux will restrict it to the one open file, but it's still a shotgun instead of a rifle.