| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | MARK CALLAGHAN <mdcallag(at)gmail(dot)com> |
| Cc: | Jim Mlodgenski <jimmy76(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Large files for relations |
| Date: | 2023-05-13 00:48:49 |
| Message-ID: | CA+hUKGLwOsZxXNg1V-q39txydrpNjuhJwBGU3zMo15GX7=dtFw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sat, May 13, 2023 at 11:01 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> On Sat, May 13, 2023 at 4:41 AM MARK CALLAGHAN <mdcallag(at)gmail(dot)com> wrote:
> > use XFS and O_DIRECT
As for direct I/O, we're only just getting started on that. We
currently can't produce more than one concurrent WAL write, and then
for relation data, we just got very basic direct I/O support but we
haven't yet got the asynchronous machinery to drive it properly (work
in progress, more soon). I was just now trying to find out what the
state of parallel direct writes is in ext4, and it looks like it's
finally happening:
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