Semantically it's the same, but maybe it is somewhat optimized? Testing right now... Edit: indeed it's different, this is the result: ... Write in 219

Semantically it's the same, but maybe it is somewhat optimized? Testing right now... Edit: indeed it's different, this is the result: ... Write in 219 microseconds Write in 253 microseconds Write in 264 microseconds Write in 271 microseconds Write in 246 microseconds ... 250 us instead of 13, but no big stops. So much better indeed... Even summing the times, every 10 writes this take 2500 us compared to 40000 us of fsync(). Definitely an improvement. p.s. all this, in ext4 FS.