Re: [Lsf-pc] [LSF/MM/BPF TOPIC] Buffered atomic writes

[Ritesh Harjani (IBM) <ritesh.list@gmail.com>]

Andres Freund <andres@anarazel.de> writes:

Hi,

> Hi,
>
> On 2026-02-17 10:23:36 +0100, Amir Goldstein wrote:
>> On Tue, Feb 17, 2026 at 8:00 AM Christoph Hellwig <hch@lst.de> wrote:
>> >
>> > I think a better session would be how we can help postgres to move
>> > off buffered I/O instead of adding more special cases for them.
>
> FWIW, we are adding support for DIO (it's been added, but performance isn't
> competitive for most workloads in the released versions yet, work to address
> those issues is in progress).
>

Is postgres also planning to evaluate the performance gains by using DIO
atomic writes available in upstream linux kernel? What would be
interesting to see is the relative %delta with DIO atomic-writes v/s
DIO non atomic writes.

That being said, I understand the discussion in this wider thread is
also around supporting write-through in linux and then adding support of
atomic writes on top of that. We have an early prototype of that
design ready and Ojaswin will be soon posting that out.

-ritesh