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Add tests for pg_stat_io
Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Justin Pryzby <pryzby@telsasoft.com> Discussion: https://postgr.es/m/20200124195226.lth52iydq2n2uilq@alap3.anarazel.de
This commit is contained in:
Andres Freund
parent
9c83bbcf7e
commit
10a082bf72
@ -66,6 +66,22 @@ SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'ALL-VISIBLE');
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INSERT INTO heaptest (a, b)
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(SELECT gs, repeat('x', gs)
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FROM generate_series(1,50) gs);
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-- pg_stat_io test:
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-- verify_heapam always uses a BAS_BULKREAD BufferAccessStrategy, whereas a
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-- sequential scan does so only if the table is large enough when compared to
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-- shared buffers (see initscan()). CREATE DATABASE ... also unconditionally
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-- uses a BAS_BULKREAD strategy, but we have chosen to use a tablespace and
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-- verify_heapam to provide coverage instead of adding another expensive
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-- operation to the main regression test suite.
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--
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-- Create an alternative tablespace and move the heaptest table to it, causing
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-- it to be rewritten and all the blocks to reliably evicted from shared
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-- buffers -- guaranteeing actual reads when we next select from it.
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SET allow_in_place_tablespaces = true;
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CREATE TABLESPACE regress_test_stats_tblspc LOCATION '';
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SELECT sum(reads) AS stats_bulkreads_before
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FROM pg_stat_io WHERE io_context = 'bulkread' \gset
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ALTER TABLE heaptest SET TABLESPACE regress_test_stats_tblspc;
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-- Check that valid options are not rejected nor corruption reported
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-- for a non-empty table
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SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'none');
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@ -88,6 +104,23 @@ SELECT * FROM verify_heapam(relation := 'heaptest', startblock := 0, endblock :=
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-------+--------+--------+-----
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(0 rows)
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-- verify_heapam should have read in the page written out by
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-- ALTER TABLE ... SET TABLESPACE ...
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-- causing an additional bulkread, which should be reflected in pg_stat_io.
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SELECT pg_stat_force_next_flush();
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pg_stat_force_next_flush
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--------------------------
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(1 row)
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SELECT sum(reads) AS stats_bulkreads_after
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FROM pg_stat_io WHERE io_context = 'bulkread' \gset
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SELECT :stats_bulkreads_after > :stats_bulkreads_before;
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?column?
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----------
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t
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(1 row)
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CREATE ROLE regress_heaptest_role;
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-- verify permissions are checked (error due to function not callable)
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SET ROLE regress_heaptest_role;
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@ -195,6 +228,7 @@ ERROR: cannot check relation "test_foreign_table"
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DETAIL: This operation is not supported for foreign tables.
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-- cleanup
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DROP TABLE heaptest;
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DROP TABLESPACE regress_test_stats_tblspc;
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DROP TABLE test_partition;
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DROP TABLE test_partitioned;
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DROP OWNED BY regress_heaptest_role; -- permissions
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@ -20,11 +20,29 @@ SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'NONE');
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SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'ALL-FROZEN');
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SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'ALL-VISIBLE');
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-- Add some data so subsequent tests are not entirely trivial
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INSERT INTO heaptest (a, b)
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(SELECT gs, repeat('x', gs)
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FROM generate_series(1,50) gs);
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-- pg_stat_io test:
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-- verify_heapam always uses a BAS_BULKREAD BufferAccessStrategy, whereas a
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-- sequential scan does so only if the table is large enough when compared to
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-- shared buffers (see initscan()). CREATE DATABASE ... also unconditionally
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-- uses a BAS_BULKREAD strategy, but we have chosen to use a tablespace and
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-- verify_heapam to provide coverage instead of adding another expensive
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-- operation to the main regression test suite.
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--
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-- Create an alternative tablespace and move the heaptest table to it, causing
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-- it to be rewritten and all the blocks to reliably evicted from shared
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-- buffers -- guaranteeing actual reads when we next select from it.
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SET allow_in_place_tablespaces = true;
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CREATE TABLESPACE regress_test_stats_tblspc LOCATION '';
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SELECT sum(reads) AS stats_bulkreads_before
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FROM pg_stat_io WHERE io_context = 'bulkread' \gset
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ALTER TABLE heaptest SET TABLESPACE regress_test_stats_tblspc;
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-- Check that valid options are not rejected nor corruption reported
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-- for a non-empty table
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SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'none');
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@ -32,6 +50,14 @@ SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'all-frozen');
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SELECT * FROM verify_heapam(relation := 'heaptest', skip := 'all-visible');
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SELECT * FROM verify_heapam(relation := 'heaptest', startblock := 0, endblock := 0);
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-- verify_heapam should have read in the page written out by
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-- ALTER TABLE ... SET TABLESPACE ...
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-- causing an additional bulkread, which should be reflected in pg_stat_io.
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SELECT pg_stat_force_next_flush();
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SELECT sum(reads) AS stats_bulkreads_after
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FROM pg_stat_io WHERE io_context = 'bulkread' \gset
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SELECT :stats_bulkreads_after > :stats_bulkreads_before;
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CREATE ROLE regress_heaptest_role;
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-- verify permissions are checked (error due to function not callable)
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@ -110,6 +136,7 @@ SELECT * FROM verify_heapam('test_foreign_table',
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-- cleanup
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DROP TABLE heaptest;
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DROP TABLESPACE regress_test_stats_tblspc;
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DROP TABLE test_partition;
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DROP TABLE test_partitioned;
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DROP OWNED BY regress_heaptest_role; -- permissions
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@ -1126,4 +1126,232 @@ SELECT pg_stat_get_subscription_stats(NULL);
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(1 row)
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-- Test that the following operations are tracked in pg_stat_io:
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-- - reads of target blocks into shared buffers
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-- - writes of shared buffers to permanent storage
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-- - extends of relations using shared buffers
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-- - fsyncs done to ensure the durability of data dirtying shared buffers
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-- There is no test for blocks evicted from shared buffers, because we cannot
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-- be sure of the state of shared buffers at the point the test is run.
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-- Create a regular table and insert some data to generate IOCONTEXT_NORMAL
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-- extends.
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SELECT sum(extends) AS io_sum_shared_before_extends
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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CREATE TABLE test_io_shared(a int);
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INSERT INTO test_io_shared SELECT i FROM generate_series(1,100)i;
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SELECT pg_stat_force_next_flush();
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pg_stat_force_next_flush
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--------------------------
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(1 row)
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SELECT sum(extends) AS io_sum_shared_after_extends
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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SELECT :io_sum_shared_after_extends > :io_sum_shared_before_extends;
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?column?
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----------
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t
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(1 row)
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-- After a checkpoint, there should be some additional IOCONTEXT_NORMAL writes
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-- and fsyncs.
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SELECT sum(writes) AS writes, sum(fsyncs) AS fsyncs
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FROM pg_stat_io
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WHERE io_context = 'normal' AND io_object = 'relation' \gset io_sum_shared_before_
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-- See comment above for rationale for two explicit CHECKPOINTs.
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CHECKPOINT;
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CHECKPOINT;
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SELECT sum(writes) AS writes, sum(fsyncs) AS fsyncs
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FROM pg_stat_io
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WHERE io_context = 'normal' AND io_object = 'relation' \gset io_sum_shared_after_
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SELECT :io_sum_shared_after_writes > :io_sum_shared_before_writes;
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?column?
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----------
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t
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(1 row)
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SELECT current_setting('fsync') = 'off'
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OR :io_sum_shared_after_fsyncs > :io_sum_shared_before_fsyncs;
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?column?
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----------
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t
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(1 row)
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-- Change the tablespace so that the table is rewritten directly, then SELECT
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-- from it to cause it to be read back into shared buffers.
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SELECT sum(reads) AS io_sum_shared_before_reads
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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ALTER TABLE test_io_shared SET TABLESPACE regress_tblspace;
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-- SELECT from the table so that the data is read into shared buffers and
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-- io_context 'normal', io_object 'relation' reads are counted.
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SELECT COUNT(*) FROM test_io_shared;
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count
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-------
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100
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(1 row)
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SELECT pg_stat_force_next_flush();
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pg_stat_force_next_flush
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--------------------------
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(1 row)
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SELECT sum(reads) AS io_sum_shared_after_reads
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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SELECT :io_sum_shared_after_reads > :io_sum_shared_before_reads;
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?column?
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----------
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t
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(1 row)
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DROP TABLE test_io_shared;
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-- Test that the follow IOCONTEXT_LOCAL IOOps are tracked in pg_stat_io:
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-- - eviction of local buffers in order to reuse them
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-- - reads of temporary table blocks into local buffers
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-- - writes of local buffers to permanent storage
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-- - extends of temporary tables
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-- Set temp_buffers to its minimum so that we can trigger writes with fewer
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-- inserted tuples. Do so in a new session in case temporary tables have been
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-- accessed by previous tests in this session.
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\c
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SET temp_buffers TO 100;
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CREATE TEMPORARY TABLE test_io_local(a int, b TEXT);
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SELECT sum(extends) AS extends, sum(evictions) AS evictions, sum(writes) AS writes
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FROM pg_stat_io
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WHERE io_context = 'normal' AND io_object = 'temp relation' \gset io_sum_local_before_
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-- Insert tuples into the temporary table, generating extends in the stats.
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-- Insert enough values that we need to reuse and write out dirty local
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-- buffers, generating evictions and writes.
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INSERT INTO test_io_local SELECT generate_series(1, 5000) as id, repeat('a', 200);
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-- Ensure the table is large enough to exceed our temp_buffers setting.
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SELECT pg_relation_size('test_io_local') / current_setting('block_size')::int8 > 100;
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?column?
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----------
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t
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(1 row)
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SELECT sum(reads) AS io_sum_local_before_reads
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'temp relation' \gset
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-- Read in evicted buffers, generating reads.
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SELECT COUNT(*) FROM test_io_local;
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count
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-------
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5000
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(1 row)
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SELECT pg_stat_force_next_flush();
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pg_stat_force_next_flush
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--------------------------
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(1 row)
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SELECT sum(evictions) AS evictions,
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sum(reads) AS reads,
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sum(writes) AS writes,
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sum(extends) AS extends
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FROM pg_stat_io
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WHERE io_context = 'normal' AND io_object = 'temp relation' \gset io_sum_local_after_
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SELECT :io_sum_local_after_evictions > :io_sum_local_before_evictions,
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:io_sum_local_after_reads > :io_sum_local_before_reads,
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:io_sum_local_after_writes > :io_sum_local_before_writes,
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:io_sum_local_after_extends > :io_sum_local_before_extends;
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?column? | ?column? | ?column? | ?column?
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----------+----------+----------+----------
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t | t | t | t
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(1 row)
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-- Change the tablespaces so that the temporary table is rewritten to other
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-- local buffers, exercising a different codepath than standard local buffer
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-- writes.
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ALTER TABLE test_io_local SET TABLESPACE regress_tblspace;
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SELECT pg_stat_force_next_flush();
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pg_stat_force_next_flush
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--------------------------
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(1 row)
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SELECT sum(writes) AS io_sum_local_new_tblspc_writes
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'temp relation' \gset
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SELECT :io_sum_local_new_tblspc_writes > :io_sum_local_after_writes;
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?column?
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----------
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t
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(1 row)
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RESET temp_buffers;
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-- Test that reuse of strategy buffers and reads of blocks into these reused
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-- buffers while VACUUMing are tracked in pg_stat_io.
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-- Set wal_skip_threshold smaller than the expected size of
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-- test_io_vac_strategy so that, even if wal_level is minimal, VACUUM FULL will
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-- fsync the newly rewritten test_io_vac_strategy instead of writing it to WAL.
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-- Writing it to WAL will result in the newly written relation pages being in
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-- shared buffers -- preventing us from testing BAS_VACUUM BufferAccessStrategy
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-- reads.
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SET wal_skip_threshold = '1 kB';
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SELECT sum(reuses) AS reuses, sum(reads) AS reads
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FROM pg_stat_io WHERE io_context = 'vacuum' \gset io_sum_vac_strategy_before_
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CREATE TABLE test_io_vac_strategy(a int, b int) WITH (autovacuum_enabled = 'false');
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INSERT INTO test_io_vac_strategy SELECT i, i from generate_series(1, 8000)i;
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-- Ensure that the next VACUUM will need to perform IO by rewriting the table
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-- first with VACUUM (FULL).
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VACUUM (FULL) test_io_vac_strategy;
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VACUUM (PARALLEL 0) test_io_vac_strategy;
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SELECT pg_stat_force_next_flush();
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pg_stat_force_next_flush
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--------------------------
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(1 row)
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SELECT sum(reuses) AS reuses, sum(reads) AS reads
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FROM pg_stat_io WHERE io_context = 'vacuum' \gset io_sum_vac_strategy_after_
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SELECT :io_sum_vac_strategy_after_reads > :io_sum_vac_strategy_before_reads,
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:io_sum_vac_strategy_after_reuses > :io_sum_vac_strategy_before_reuses;
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?column? | ?column?
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----------+----------
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t | t
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(1 row)
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RESET wal_skip_threshold;
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-- Test that extends done by a CTAS, which uses a BAS_BULKWRITE
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-- BufferAccessStrategy, are tracked in pg_stat_io.
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SELECT sum(extends) AS io_sum_bulkwrite_strategy_extends_before
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FROM pg_stat_io WHERE io_context = 'bulkwrite' \gset
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CREATE TABLE test_io_bulkwrite_strategy AS SELECT i FROM generate_series(1,100)i;
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SELECT pg_stat_force_next_flush();
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pg_stat_force_next_flush
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--------------------------
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(1 row)
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SELECT sum(extends) AS io_sum_bulkwrite_strategy_extends_after
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FROM pg_stat_io WHERE io_context = 'bulkwrite' \gset
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SELECT :io_sum_bulkwrite_strategy_extends_after > :io_sum_bulkwrite_strategy_extends_before;
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?column?
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----------
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t
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(1 row)
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-- Test IO stats reset
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SELECT pg_stat_have_stats('io', 0, 0);
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pg_stat_have_stats
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--------------------
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t
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(1 row)
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SELECT sum(evictions) + sum(reuses) + sum(extends) + sum(fsyncs) + sum(reads) + sum(writes) AS io_stats_pre_reset
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FROM pg_stat_io \gset
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SELECT pg_stat_reset_shared('io');
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pg_stat_reset_shared
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----------------------
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(1 row)
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SELECT sum(evictions) + sum(reuses) + sum(extends) + sum(fsyncs) + sum(reads) + sum(writes) AS io_stats_post_reset
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FROM pg_stat_io \gset
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SELECT :io_stats_post_reset < :io_stats_pre_reset;
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?column?
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----------
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t
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(1 row)
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-- End of Stats Test
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@ -536,4 +536,146 @@ SELECT pg_stat_get_replication_slot(NULL);
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SELECT pg_stat_get_subscription_stats(NULL);
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-- Test that the following operations are tracked in pg_stat_io:
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-- - reads of target blocks into shared buffers
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-- - writes of shared buffers to permanent storage
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-- - extends of relations using shared buffers
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-- - fsyncs done to ensure the durability of data dirtying shared buffers
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-- There is no test for blocks evicted from shared buffers, because we cannot
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-- be sure of the state of shared buffers at the point the test is run.
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-- Create a regular table and insert some data to generate IOCONTEXT_NORMAL
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-- extends.
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SELECT sum(extends) AS io_sum_shared_before_extends
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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CREATE TABLE test_io_shared(a int);
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INSERT INTO test_io_shared SELECT i FROM generate_series(1,100)i;
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SELECT pg_stat_force_next_flush();
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SELECT sum(extends) AS io_sum_shared_after_extends
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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SELECT :io_sum_shared_after_extends > :io_sum_shared_before_extends;
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-- After a checkpoint, there should be some additional IOCONTEXT_NORMAL writes
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-- and fsyncs.
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SELECT sum(writes) AS writes, sum(fsyncs) AS fsyncs
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FROM pg_stat_io
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WHERE io_context = 'normal' AND io_object = 'relation' \gset io_sum_shared_before_
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-- See comment above for rationale for two explicit CHECKPOINTs.
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CHECKPOINT;
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CHECKPOINT;
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SELECT sum(writes) AS writes, sum(fsyncs) AS fsyncs
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FROM pg_stat_io
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WHERE io_context = 'normal' AND io_object = 'relation' \gset io_sum_shared_after_
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SELECT :io_sum_shared_after_writes > :io_sum_shared_before_writes;
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SELECT current_setting('fsync') = 'off'
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OR :io_sum_shared_after_fsyncs > :io_sum_shared_before_fsyncs;
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-- Change the tablespace so that the table is rewritten directly, then SELECT
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-- from it to cause it to be read back into shared buffers.
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SELECT sum(reads) AS io_sum_shared_before_reads
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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ALTER TABLE test_io_shared SET TABLESPACE regress_tblspace;
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-- SELECT from the table so that the data is read into shared buffers and
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-- io_context 'normal', io_object 'relation' reads are counted.
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SELECT COUNT(*) FROM test_io_shared;
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SELECT pg_stat_force_next_flush();
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SELECT sum(reads) AS io_sum_shared_after_reads
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FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'relation' \gset
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SELECT :io_sum_shared_after_reads > :io_sum_shared_before_reads;
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DROP TABLE test_io_shared;
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-- Test that the follow IOCONTEXT_LOCAL IOOps are tracked in pg_stat_io:
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-- - eviction of local buffers in order to reuse them
|
||||
-- - reads of temporary table blocks into local buffers
|
||||
-- - writes of local buffers to permanent storage
|
||||
-- - extends of temporary tables
|
||||
|
||||
-- Set temp_buffers to its minimum so that we can trigger writes with fewer
|
||||
-- inserted tuples. Do so in a new session in case temporary tables have been
|
||||
-- accessed by previous tests in this session.
|
||||
\c
|
||||
SET temp_buffers TO 100;
|
||||
CREATE TEMPORARY TABLE test_io_local(a int, b TEXT);
|
||||
SELECT sum(extends) AS extends, sum(evictions) AS evictions, sum(writes) AS writes
|
||||
FROM pg_stat_io
|
||||
WHERE io_context = 'normal' AND io_object = 'temp relation' \gset io_sum_local_before_
|
||||
-- Insert tuples into the temporary table, generating extends in the stats.
|
||||
-- Insert enough values that we need to reuse and write out dirty local
|
||||
-- buffers, generating evictions and writes.
|
||||
INSERT INTO test_io_local SELECT generate_series(1, 5000) as id, repeat('a', 200);
|
||||
-- Ensure the table is large enough to exceed our temp_buffers setting.
|
||||
SELECT pg_relation_size('test_io_local') / current_setting('block_size')::int8 > 100;
|
||||
|
||||
SELECT sum(reads) AS io_sum_local_before_reads
|
||||
FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'temp relation' \gset
|
||||
-- Read in evicted buffers, generating reads.
|
||||
SELECT COUNT(*) FROM test_io_local;
|
||||
SELECT pg_stat_force_next_flush();
|
||||
SELECT sum(evictions) AS evictions,
|
||||
sum(reads) AS reads,
|
||||
sum(writes) AS writes,
|
||||
sum(extends) AS extends
|
||||
FROM pg_stat_io
|
||||
WHERE io_context = 'normal' AND io_object = 'temp relation' \gset io_sum_local_after_
|
||||
SELECT :io_sum_local_after_evictions > :io_sum_local_before_evictions,
|
||||
:io_sum_local_after_reads > :io_sum_local_before_reads,
|
||||
:io_sum_local_after_writes > :io_sum_local_before_writes,
|
||||
:io_sum_local_after_extends > :io_sum_local_before_extends;
|
||||
|
||||
-- Change the tablespaces so that the temporary table is rewritten to other
|
||||
-- local buffers, exercising a different codepath than standard local buffer
|
||||
-- writes.
|
||||
ALTER TABLE test_io_local SET TABLESPACE regress_tblspace;
|
||||
SELECT pg_stat_force_next_flush();
|
||||
SELECT sum(writes) AS io_sum_local_new_tblspc_writes
|
||||
FROM pg_stat_io WHERE io_context = 'normal' AND io_object = 'temp relation' \gset
|
||||
SELECT :io_sum_local_new_tblspc_writes > :io_sum_local_after_writes;
|
||||
RESET temp_buffers;
|
||||
|
||||
-- Test that reuse of strategy buffers and reads of blocks into these reused
|
||||
-- buffers while VACUUMing are tracked in pg_stat_io.
|
||||
|
||||
-- Set wal_skip_threshold smaller than the expected size of
|
||||
-- test_io_vac_strategy so that, even if wal_level is minimal, VACUUM FULL will
|
||||
-- fsync the newly rewritten test_io_vac_strategy instead of writing it to WAL.
|
||||
-- Writing it to WAL will result in the newly written relation pages being in
|
||||
-- shared buffers -- preventing us from testing BAS_VACUUM BufferAccessStrategy
|
||||
-- reads.
|
||||
SET wal_skip_threshold = '1 kB';
|
||||
SELECT sum(reuses) AS reuses, sum(reads) AS reads
|
||||
FROM pg_stat_io WHERE io_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;
|
||||
-- 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;
|
||||
SELECT pg_stat_force_next_flush();
|
||||
SELECT sum(reuses) AS reuses, sum(reads) AS reads
|
||||
FROM pg_stat_io WHERE io_context = 'vacuum' \gset io_sum_vac_strategy_after_
|
||||
SELECT :io_sum_vac_strategy_after_reads > :io_sum_vac_strategy_before_reads,
|
||||
:io_sum_vac_strategy_after_reuses > :io_sum_vac_strategy_before_reuses;
|
||||
RESET wal_skip_threshold;
|
||||
|
||||
-- Test that extends done by a CTAS, which uses a BAS_BULKWRITE
|
||||
-- BufferAccessStrategy, are tracked in pg_stat_io.
|
||||
SELECT sum(extends) AS io_sum_bulkwrite_strategy_extends_before
|
||||
FROM pg_stat_io WHERE io_context = 'bulkwrite' \gset
|
||||
CREATE TABLE test_io_bulkwrite_strategy AS SELECT i FROM generate_series(1,100)i;
|
||||
SELECT pg_stat_force_next_flush();
|
||||
SELECT sum(extends) AS io_sum_bulkwrite_strategy_extends_after
|
||||
FROM pg_stat_io WHERE io_context = 'bulkwrite' \gset
|
||||
SELECT :io_sum_bulkwrite_strategy_extends_after > :io_sum_bulkwrite_strategy_extends_before;
|
||||
|
||||
-- Test IO stats reset
|
||||
SELECT pg_stat_have_stats('io', 0, 0);
|
||||
SELECT sum(evictions) + sum(reuses) + sum(extends) + sum(fsyncs) + sum(reads) + sum(writes) AS io_stats_pre_reset
|
||||
FROM pg_stat_io \gset
|
||||
SELECT pg_stat_reset_shared('io');
|
||||
SELECT sum(evictions) + sum(reuses) + sum(extends) + sum(fsyncs) + sum(reads) + sum(writes) AS io_stats_post_reset
|
||||
FROM pg_stat_io \gset
|
||||
SELECT :io_stats_post_reset < :io_stats_pre_reset;
|
||||
|
||||
-- End of Stats Test
|
||||
|
||||
Loading…
Reference in New Issue
Block a user