Re: Checksums by default?

* Fujii Masao (masao(dot)fujii(at)gmail(dot)com) wrote:
> On Sun, Jan 22, 2017 at 12:18 AM, Petr Jelinek
> <petr(dot)jelinek(at)2ndquadrant(dot)com> wrote:
> > On 21/01/17 11:39, Magnus Hagander wrote:
> >> Is it time to enable checksums by default, and give initdb a switch to
> >> turn it off instead?
> >
> > I'd like to see benchmark first, both in terms of CPU and in terms of
> > produced WAL (=network traffic) given that it turns on logging of hint bits.
>
> +1
>
> If the performance overhead by the checksums is really negligible,
> we may be able to get rid of wal_log_hints parameter, as well.

Prior benchmarks showed it to be on the order of a few percent, as I
recall, so I'm not sure that we can say it's negligible (and that's not
why Magnus was proposing changing the default).

Thanks!

Stephen