| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Aditya Kamath <Aditya(dot)Kamath1(at)ibm(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Noah Misch <noah(at)leadboat(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Srirama Kucherlapati <sriram(dot)rk(at)in(dot)ibm(dot)com>, "peter(at)eisentraut(dot)org" <peter(at)eisentraut(dot)org>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "hlinnaka(at)iki(dot)fi" <hlinnaka(at)iki(dot)fi>, "tristan(at)partin(dot)io" <tristan(at)partin(dot)io>, "postgres-ibm-aix(at)wwpdl(dot)vnet(dot)ibm(dot)com" <postgres-ibm-aix(at)wwpdl(dot)vnet(dot)ibm(dot)com> |
| Subject: | Re: AIX support |
| Date: | 2026-02-04 14:55:00 |
| Message-ID: | CA+Tgmoa18SthNDeZXC_yBKEMAn8MVt=HSzhBuHwoXa8=uEH=LA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Feb 3, 2026 at 11:33 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Apparently, because its file system sucks. One thing we do over and
> over in the TAP tests is to copy an initialized data directory to
> prepare a new instance, basically "cp -RPp template-dir $PGDATA".
> I'm observing that taking about 22 seconds on the AIX machine
> (which is actually slower than running initdb would be: about 15s),
> compared to 2.6s on the G4, and about 0.035s on my Linux workstation
> (which can do the same overall -j2 check-world in five minutes).
>
> To be clear, there is as far as I can tell next to zero background
> I/O load on cfarm119. This is a typical readout when I'm not
> running anything:
I'd kinda want to see some evidence that this affects all machines
rather than just this one. I mean, AIX may not be the most modern
thing out there, so maybe it's not great at disk I/O, but these tests
don't tell us whether it's the OS that sucks or the hardware.
--
Robert Haas
EDB: http://www.enterprisedb.com
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