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MDEV-15058: Deprecate and ignore innodb_buffer_pool_instances

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Our benchmarking efforts indicate that the reasons for splitting the
buf_pool in commit c18084f71b
have mostly gone away, possibly as a result of
mysql/mysql-server@ce6109ebfd
or similar work.

Only in one write-heavy benchmark where the working set size is
ten times the buffer pool size, the buf_pool->mutex would be
less contended with 4 buffer pool instances than with 1 instance,
in buf_page_io_complete(). That contention could be alleviated
further by making more use of std::atomic and by splitting
buf_pool_t::mutex further (MDEV-15053).

We will deprecate and ignore the following parameters:

	innodb_buffer_pool_instances
	innodb_page_cleaners

There will be only one buffer pool and one page cleaner task.

In a number of INFORMATION_SCHEMA views, columns that indicated
the buffer pool instance will be removed:

	information_schema.innodb_buffer_page.pool_id
	information_schema.innodb_buffer_page_lru.pool_id
	information_schema.innodb_buffer_pool_stats.pool_id
	information_schema.innodb_cmpmem.buffer_pool_instance
	information_schema.innodb_cmpmem_reset.buffer_pool_instance
This commit is contained in:
Marko Mäkelä
2020-02-12 14:45:21 +02:00
parent 0448c614c8
commit 1a6f708ec5
47 changed files with 2140 additions and 5024 deletions
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1
mysql-test/suite/innodb_i_s/innodb_buffer_pool_stats.result
View File

@@ -1,7 +1,6 @@
SHOW CREATE TABLE INFORMATION_SCHEMA.INNODB_BUFFER_POOL_STATS;
Table Create Table
INNODB_BUFFER_POOL_STATS CREATE TEMPORARY TABLE `INNODB_BUFFER_POOL_STATS` (
`POOL_ID` int(11) unsigned NOT NULL DEFAULT 0,
`POOL_SIZE` bigint(21) unsigned NOT NULL DEFAULT 0,
`FREE_BUFFERS` bigint(21) unsigned NOT NULL DEFAULT 0,
`DATABASE_PAGES` bigint(21) unsigned NOT NULL DEFAULT 0,