libeatmydata is a small LD_PRELOAD library designed to (transparently) disable fsync (and friends, like open(O_SYNC)). This has two side-effects: making software that writes data safely to disk a lot quicker and making this software no longer crash safe.
DO NOT use libeatmydata on software where you care about what it stores. It's called libEAT-MY-DATA for a reason.
Also just some latin pedantry, the article mentions the phrase: Caveat imperator a couple of times. I assume to mean Let the buyer beware, which as far as I know is Caveat emptor.
Google latin translating: https://translate.google.com/#view=home&op=translate&sl=la&t...
Does caveat imperator have another meaning (perhaps the emperor is infallible)?