On Sat, Jul 1, 2023 at 12:21:03AM +0200, Tomas Vondra wrote: > On 6/30/23 23:53, Bruce Momjian wrote: > > For a 4kB write, to say it is not partially written would be to require > > the operating system to guarantee that the 4kB write is not split into > > smaller writes which might each be atomic because smaller atomic writes > > would not help us. > > Right, that's the dance we do to protect against torn pages. But Andres > suggested that if you have modern storage and configure it correctly, > writing with 4kB pages would be atomic. So we wouldn't need to do this > FPI stuff, eliminating pretty significant source of write amplification.
I agree the hardware is atomic for 4k writes, but do we know the OS always issues 4k writes? -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com Only you can decide what is important to you.
