public inbox for [email protected]  

help / color / mirror / Atom feed

From: Nathan Bossart <[email protected]>
To: Andres Freund <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Alexander Lakhin <[email protected]>
Cc: Sami Imseih <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: Robert Treat <[email protected]>
Cc: [email protected]
Cc: pgsql-hackers <[email protected]>
Cc: [email protected]
Subject: Re: Add pg_stat_autovacuum_priority
Date: Wed, 8 Apr 2026 16:23:45 -0500
Message-ID: <adbHYQMZ0pHQttWa@nathan> (raw)
In-Reply-To: <u3akkfw3vaocviudt6f7ft4kxjc2273rh3tfhz5rfwg6jrcc2t@wurwws6wgjjz>
References: <adFiCgN22xJ7Z-oR@nathan>
	<CAA5RZ0vRP-W2wJD2OxEb-=VGj2sp5pMCqHQg9YJiuDVPhaY5jQ@mail.gmail.com>
	<adQsdvPPNviWMCXb@nathan>
	<[email protected]>
	<[email protected]>
	<adaWuTR7oCKodH7k@nathan>
	<[email protected]>
	<adan_E0o69p81lIj@nathan>
	<[email protected]>
	<u3akkfw3vaocviudt6f7ft4kxjc2273rh3tfhz5rfwg6jrcc2t@wurwws6wgjjz>

On Wed, Apr 08, 2026 at 04:40:03PM -0400, Andres Freund wrote:
> Note that the whole cached state does automatically get reset at the end of
> the transaction (AtEOXact_PgStat()->pgstat_clear_snapshot()), just like it did
> before the shmem stats stuff.

I see a lot of memory used for the pgStatEntryRefHash table, too (e.g., ~16
MB for 100K tables).  What's interesting is that I cannot reproduce similar
usage with views like pg_stat_all_tables.  If memory was not a concern, I
think the "bool *may_free" idea would be fine.  But assuming it is, we will
probably need to do something more creative.

-- 
nathan

view thread (60+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
  Subject: Re: Add pg_stat_autovacuum_priority
  In-Reply-To: <adbHYQMZ0pHQttWa@nathan>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox