Re: per backend I/O statistics

Hello Michael,

19.12.2024 06:21, Michael Paquier wrote:
> Fixed that, bumped the two version counters, and done.

Could you, please, look at recent failures produced by grassquit (which
has fsync = on in it's config), on an added test case? For instance, [1]:
--- /home/bf/bf-build/grassquit/HEAD/pgsql/src/test/regress/expected/stats.out 2024-12-19 04:44:08.779311933 +0000
+++ /home/bf/bf-build/grassquit/HEAD/pgsql.build/testrun/recovery/027_stream_regress/data/results/stats.out 2024-12-19 
16:37:41.351784840 +0000
@@ -1333,7 +1333,7 @@
        AND :my_io_sum_shared_after_fsyncs= 0);
   ?column?
  ----------
- t
+ f
  (1 row)

The complete query is:
SELECT current_setting('fsync') = 'off'
   OR (:my_io_sum_shared_after_fsyncs = :my_io_sum_shared_before_fsyncs
       AND :my_io_sum_shared_after_fsyncs= 0);

And the corresponding query in 027_stream_regress_primary.log is:
2024-12-19 16:37:39.907 UTC [4027467][client backend][15/1980:0] LOG:  statement: SELECT current_setting('fsync') = 'off'
       OR (1 = 1
           AND 1= 0);

(I can reproduce this locally with an asan-enabled build too.)

[1] https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=grassquit&dt=2024-12-19%2016%3A28%3A58

Best regards,
Alexander