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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Jelte Fennema-Nio <postgres@jeltef.nl>
Cc: torikoshia <torikoshia@oss.nttdata.com>
Cc: pgsql-hackers@postgresql.org
Cc: rjuju123@gmail.com
Cc: Bruce Momjian <bruce@momjian.us>
Subject: Re: RFC: Allow EXPLAIN to Output Page Fault Information
Date: Sun, 09 Feb 2025 13:05:42 -0500
Message-ID: <2035079.1739124342@sss.pgh.pa.us> (raw)
In-Reply-To: <myw76agwrlmisvamwbfl6ibxgwh5glzitydiwnfmtb5aui232i@274yxxtnbnsp>
References: <D6MJOHS7HZ80.3B17NDGUV6T47@jeltef.nl>
<Z3LII9YEgp3kAZG-@momjian.us>
<3861403.1735576764@sss.pgh.pa.us>
<D6PENGW1PL79.266GQNPSMRIGA@jeltef.nl>
<1f22794321b745549d54359d343e37b8@oss.nttdata.com>
<D6V9GJ2LOLC5.1ZF3BWKKEBZWC@jeltef.nl>
<CAM6-o=BE=oewSsdNKrbbNjR2muzQR49STXsuta+Wpq6CSyxTag@mail.gmail.com>
<2c9d6eaf26df17bec13bb03bf1e9bcbb@oss.nttdata.com>
<CAGECzQRvcLx44N3zd_DGCjY02XX4AqXX8mq4BiS8C9Froy+Jhg@mail.gmail.com>
<CAGECzQQdc-k=M2fMCKa98kVZntc=6d3rpd6edt8Qs45cayfUeQ@mail.gmail.com>
<myw76agwrlmisvamwbfl6ibxgwh5glzitydiwnfmtb5aui232i@274yxxtnbnsp>
Andres Freund <andres@anarazel.de> writes:
> I'm somewhat against this patch, as it's fairly fundamentally incompatible
> with AIO. There's no real way to get information in this manner if the IO
> isn't executed synchronously in process context...
Even without looking ahead to AIO, there's bgwriter, walwriter, and
checkpointer processes that all take I/O load away from foreground
processes. I don't really believe that this will produce useful
numbers.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, andres@anarazel.de, postgres@jeltef.nl, torikoshia@oss.nttdata.com, rjuju123@gmail.com, bruce@momjian.us
Subject: Re: RFC: Allow EXPLAIN to Output Page Fault Information
In-Reply-To: <2035079.1739124342@sss.pgh.pa.us>
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