From: | Stephen Frost <sfrost(at)snowman(dot)net> |
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To: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
Cc: | Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Checksums by default? |
Date: | 2017-01-21 15:48:56 |
Message-ID: | 20170121154856.GE18360@tamriel.snowman.net |
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Lists: | pgsql-hackers |
* 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
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