| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: design for parallel backup |
| Date: | 2020-04-21 15:36:02 |
| Message-ID: | 20200421153602.z6de5ixate5hp5j4@alap3.anarazel.de |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi,
On 2020-04-21 07:18:20 -0400, Robert Haas wrote:
> On Tue, Apr 21, 2020 at 2:44 AM Andres Freund <andres(at)anarazel(dot)de> wrote:
> > FWIW, I just tested pg_basebackup locally.
> >
> > Without compression and a stock postgres I get:
> > unix tcp tcp+ssl:
> > 1.74GiB/s 1.02GiB/s 699MiB/s
> >
> > That turns out to be bottlenecked by the backup manifest generation.
>
> Whoa. That's unexpected, at least for me. Is that because of the
> CRC-32C overhead, or something else? What do you get with
> --manifest-checksums=none?
It's all CRC overhead. I don't see a difference with
--manifest-checksums=none anymore. We really should look for a better
"fast" checksum.
Regards,
Andres
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