| From: | Stephen Frost <sfrost(at)snowman(dot)net> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Ryan Murphy <ryanfmurphy(at)gmail(dot)com>, Beena Emerson <memissemerson(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Re: Clarifying "server starting" messaging in pg_ctl start without --wait |
| Date: | 2017-01-20 01:35:11 |
| Message-ID: | 20170120013511.GA18360@tamriel.snowman.net |
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| Lists: | pgsql-hackers |
* Michael Paquier (michael(dot)paquier(at)gmail(dot)com) wrote:
> On Fri, Jan 20, 2017 at 12:06 AM, Stephen Frost <sfrost(at)snowman(dot)net> wrote:
> > We did make the WAL checksum routines a lot
> > faster with 9.6, as I recall, so perhaps there's been some change there
> > too.
>
> 9.5, commit 5028f22f with Abhijit's and Heikki's work on CRC-32 computations.
Oh, was it 9.5 where we added the code to use CPU OPs to speed up the
calculations..? If so then that surprises me a bit, as, if I recall
correctly, I had a 9.5-based server where the replica simply couldn't
keep up with replay and was entirely CPU-bound..
I had thought those changes went into 9.6. If they were in 9.5 then
that's possibly a bit disappointing.
Of course, this was a while ago, perhaps that was actually a 9.4
server.. mmm, will have to go find out.
Thanks!
Stephen
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