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From: Tom Lane <[email protected]>
To: Andres Freund <[email protected]>
Cc: Kyotaro Horiguchi <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Subject: Re: pg_stat_bgwriter.buffers_backend is pretty meaningless (and more?)
Date: Sat, 04 Mar 2023 18:21:09 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CAAKRu_af0YcV9CXG9M5R06tYRUzk13+H7qOsU6etmS4zE7RAUQ@mail.gmail.com>
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Andres Freund <[email protected]> writes:
> Just pushed the actual pg_stat_io view, the splitting of the tablespace test,
> and the pg_stat_io tests.

One of the test cases is flapping a bit:

diff -U3 /home/pg/build-farm-15/buildroot/HEAD/pgsql.build/src/test/regress/expected/stats.out /home/pg/build-farm-15/buildroot/HEAD/pgsql.build/src/test/regress/results/stats.out
--- /home/pg/build-farm-15/buildroot/HEAD/pgsql.build/src/test/regress/expected/stats.out	2023-03-04 21:30:05.891579466 +0100
+++ /home/pg/build-farm-15/buildroot/HEAD/pgsql.build/src/test/regress/results/stats.out	2023-03-04 21:34:26.745552661 +0100
@@ -1201,7 +1201,7 @@
 SELECT :io_sum_shared_after_reads > :io_sum_shared_before_reads;
  ?column? 
 ----------
- t
+ f
 (1 row)
 
 DROP TABLE test_io_shared;

There are two instances of this today [1][2], and I've seen it before
but failed to note down where.

			regards, tom lane

[1] https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=grison&dt=2023-03-04%2021%3A19%3A39
[2] https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=mule&dt=2023-03-04%2020%3A30%3A05

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