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This makes very little sense. The author shows a fsync() benchmark comparing an actualy fsync (Pixel on ext4 without nobarrier) with a nobarrier (no-op fsync) alternative. The only thing this benchmark shows is that a no-op is faster than the real thing.

discuss

idbehold|9 years ago

The title of the article is "Why [the] Google Pixel lags 10x more than [the] Moto Z." The author showed that the Moto Z is using a no-op fsync while the Pixel is doing the real thing. I think the author appropriately explained and answered the title prompt.

moonlander|9 years ago

But the author fails to prove that fsync() is in any way the bottleneck for common I/O operations in everyday use of a smartphone.

cbsmith|9 years ago

Saying "no-op is faster than fsync" is just not as click-baity a title.

There is a good question though... do you really need fsync on Android? If you don't, why are you calling it?