Re: IO scheduler recommendation

Thanks Laurenz
Surprise to know that there are no official recommendation from PostgreSQL.

On Mon, Jan 21, 2019 at 9:14 PM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
wrote:

> AB_ba# wrote:
> > I searched the complete PostgreSQL Documentation but didn't get anything
> with respect to IO scheduler recommendation.
> > What is being recommended by PostgreSQL ?
>
> There is no clear recommendation.
>
> I personally have seen workloads where changing from "cfq" to "deadline"
> or "noop" improved performance by a factor of 4, but on many systems "cfq"
> seems to be doing at least as good as the others.
>
> I believe that it depends a lot on your hardware configuration and
> your workload, and you are best advised to run a realistic load test.
>
> > Which is the best IO scheduler considering the Data is hosted on NFS?
>
> No idea - probably depends on what is behind the NFS.
>
> Make sure to use hard, fg mounts.
> If you can, use "jumbo frames" so that an 8KB block can fit into
> a single IP frame.
>
> Yours,
> Laurenz Albe
> --
> Cybertec | https://www.cybertec-postgresql.com
>
>

--
Thanks and Regards
ANUP BHARTI