public inbox for [email protected]  

help / color / mirror / Atom feed

From: Fujii Masao <[email protected]>
To: [email protected]
Subject: pg_stat_io for the startup process
Date: Tue, 25 Apr 2023 22:51:14 +0900
Message-ID: <[email protected]> (raw)

Hi,

Regarding pg_stat_io for the startup process, I noticed that the counters
are only incremented after the startup process exits, not during WAL replay
in standby mode. This is because pgstat_flush_io() is only called when
the startup process exits. Shouldn't it be called during WAL replay as well
to report IO statistics by the startup process even in standby mode?

Also, the pg_stat_io view includes a row with backend_type=startup and
context=vacuum, but it seems that the startup process doesn't perform
any I/O operations with BAS_VACUUM. If this understanding is right,
shouldn't we omit this row from the view? Additionally, I noticed that
the view also includes a row with backend_type=startup and
context=bulkread / bulkwrite. Do these operations actually occur
during startup process?

Regards,

-- 
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION

view thread (2+ messages)

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]
  Subject: Re: pg_stat_io for the startup process
  In-Reply-To: <[email protected]>

* 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