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Use BUFFER_USAGE_LIMIT to reduce needed test table size 

Using the minimum BUFFER_USAGE_LIMIT value, we can make one of the pg_stat_io
test tables smaller while still causing reuses.

Author: Melanie Plageman <melanieplageman@gmail.com>
Discussion: https://postgr.es/m/CAAKRu_acc6iL4M3hvOTeztf_ZPpsB3Pqio5aVHgZ5q=Pi3BZKg@mail.gmail.com
This commit is contained in:
Andres Freund 2023-05-17 11:17:02 -07:00
parent b9a7a82272
commit 322875597c
2 changed files with 8 additions and 4 deletions
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6
src/test/regress/expected/stats.out
View File

@ -1396,11 +1396,13 @@ SET wal_skip_threshold = '1 kB';
SELECT sum(reuses) AS reuses, sum(reads) AS reads
FROM pg_stat_io WHERE context = 'vacuum' \gset io_sum_vac_strategy_before_
CREATE TABLE test_io_vac_strategy(a int, b int) WITH (autovacuum_enabled = 'false');
INSERT INTO test_io_vac_strategy SELECT i, i from generate_series(1, 8000)i;
INSERT INTO test_io_vac_strategy SELECT i, i from generate_series(1, 4500)i;
-- Ensure that the next VACUUM will need to perform IO by rewriting the table
-- first with VACUUM (FULL).
VACUUM (FULL) test_io_vac_strategy;
VACUUM (PARALLEL 0) test_io_vac_strategy;
-- Use the minimum BUFFER_USAGE_LIMIT to cause reuses with the smallest table
-- possible.
VACUUM (PARALLEL 0, BUFFER_USAGE_LIMIT 128) test_io_vac_strategy;
SELECT pg_stat_force_next_flush();
pg_stat_force_next_flush
--------------------------

6
src/test/regress/sql/stats.sql
View File

@ -690,11 +690,13 @@ SET wal_skip_threshold = '1 kB';
SELECT sum(reuses) AS reuses, sum(reads) AS reads
FROM pg_stat_io WHERE context = 'vacuum' \gset io_sum_vac_strategy_before_
CREATE TABLE test_io_vac_strategy(a int, b int) WITH (autovacuum_enabled = 'false');
INSERT INTO test_io_vac_strategy SELECT i, i from generate_series(1, 8000)i;
INSERT INTO test_io_vac_strategy SELECT i, i from generate_series(1, 4500)i;
-- Ensure that the next VACUUM will need to perform IO by rewriting the table
-- first with VACUUM (FULL).
VACUUM (FULL) test_io_vac_strategy;
VACUUM (PARALLEL 0) test_io_vac_strategy;
-- Use the minimum BUFFER_USAGE_LIMIT to cause reuses with the smallest table
-- possible.
VACUUM (PARALLEL 0, BUFFER_USAGE_LIMIT 128) test_io_vac_strategy;
SELECT pg_stat_force_next_flush();
SELECT sum(reuses) AS reuses, sum(reads) AS reads
FROM pg_stat_io WHERE context = 'vacuum' \gset io_sum_vac_strategy_after_