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Bug 12356373 - PERFORMANCE REGRESSION FROM 5.1 TO 5.5 : GROUP BY:

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The title of the bug is a little confusing. The actual fix is to
reintroduce random readahead inside InnoDB with a dynamic, global
switch innodb_random_read_ahead [default = off].

Approved by: Sunny Bains
rb://696
This commit is contained in:
Inaam Rana
2011-07-19 10:37:37 -04:00
parent 0f543e8e9d
commit aa3d29681e
8 changed files with 232 additions and 7 deletions
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2
storage/innodb_plugin/include/srv0srv.h
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@@ -143,6 +143,7 @@ extern ulint srv_mem_pool_size;
extern ulint srv_lock_table_size;
extern ulint srv_n_file_io_threads;
extern my_bool srv_random_read_ahead;
extern ulong srv_read_ahead_threshold;
extern ulint srv_n_read_io_threads;
extern ulint srv_n_write_io_threads;
@@ -618,6 +619,7 @@ struct export_var_struct{
ulint innodb_buffer_pool_wait_free; /*!< srv_buf_pool_wait_free */
ulint innodb_buffer_pool_pages_flushed; /*!< srv_buf_pool_flushed */
ulint innodb_buffer_pool_write_requests;/*!< srv_buf_pool_write_requests */
ulint innodb_buffer_pool_read_ahead_rnd;/*!< srv_read_ahead_rnd */
ulint innodb_buffer_pool_read_ahead; /*!< srv_read_ahead */
ulint innodb_buffer_pool_read_ahead_evicted;/*!< srv_read_ahead evicted*/
ulint innodb_dblwr_pages_written; /*!< srv_dblwr_pages_written */