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Relax regression test for fsync check of backend-level stats

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One test added in 9aea73fc61 did not take into account that the
backend may have some fsync even after a checkpoint.  Let's relax it to
be more flexible.

Per report from buildfarm member grassquit, via Alexander Lakhin.

Author: Bertrand Drouvot
Discussion: https://postgr.es/m/6143ab0a-9e88-4790-8d9d-50ba45657761@gmail.com
This commit is contained in:
Michael Paquier 2024-12-20 19:00:18 +09:00
parent 5983a4cffc
commit 546371599e
2 changed files with 4 additions and 6 deletions
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5
src/test/regress/expected/stats.out
View File

@ -1299,7 +1299,7 @@ SELECT :my_io_sum_shared_after_extends > :my_io_sum_shared_before_extends;
(1 row)
-- After a checkpoint, there should be some additional IOCONTEXT_NORMAL writes
-- and fsyncs in the global stats (not for the backend).
-- and fsyncs in the global stats (usually not for the backend).
-- See comment above for rationale for two explicit CHECKPOINTs.
CHECKPOINT;
CHECKPOINT;
@ -1329,8 +1329,7 @@ SELECT :my_io_sum_shared_after_writes >= :my_io_sum_shared_before_writes;
(1 row)
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);
OR :my_io_sum_shared_after_fsyncs >= :my_io_sum_shared_before_fsyncs;
?column?
----------
t

5
src/test/regress/sql/stats.sql
View File

@ -633,7 +633,7 @@ SELECT sum(extends) AS my_io_sum_shared_after_extends
SELECT :my_io_sum_shared_after_extends > :my_io_sum_shared_before_extends;
-- After a checkpoint, there should be some additional IOCONTEXT_NORMAL writes
-- and fsyncs in the global stats (not for the backend).
-- and fsyncs in the global stats (usually not for the backend).
-- See comment above for rationale for two explicit CHECKPOINTs.
CHECKPOINT;
CHECKPOINT;
@ -648,8 +648,7 @@ SELECT sum(writes) AS writes, sum(fsyncs) AS fsyncs
WHERE object = 'relation' \gset my_io_sum_shared_after_
SELECT :my_io_sum_shared_after_writes >= :my_io_sum_shared_before_writes;
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);
OR :my_io_sum_shared_after_fsyncs >= :my_io_sum_shared_before_fsyncs;
-- Change the tablespace so that the table is rewritten directly, then SELECT
-- from it to cause it to be read back into shared buffers.