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The new statistics is enabled by adding the "engine", "innodb" or "full" option to --log-slow-verbosity Example output: # Pages_accessed: 184 Pages_read: 95 Pages_updated: 0 Old_rows_read: 1 # Pages_read_time: 17.0204 Engine_time: 248.1297 Page_read_time is time doing physical reads inside a storage engine. (Writes cannot be tracked as these are usually done in the background). Engine_time is the time spent inside the storage engine for the full duration of the read/write/update calls. It uses the same code as 'analyze statement' for calculating the time spent. The engine statistics is done with a generic interface that should be easy for any engine to use. It can also easily be extended to provide even more statistics. Currently only InnoDB has counters for Pages_% and Undo_% status. Engine_time works for all engines. Implementation details: class ha_handler_stats holds all engine stats. This class is included in handler and THD classes. While a query is running, all statistics is updated in the handler. In close_thread_tables() the statistics is added to the THD. handler::handler_stats is a pointer to where statistics should be collected. This is set to point to handler::active_handler_stats if stats are requested. If not, it is set to 0. handler_stats has also an element, 'active' that is 1 if stats are requested. This is to allow engines to avoid doing any 'if's while updating the statistics. Cloned or partition tables have the pointer set to the base table if status are requested. There is a small performance impact when using --log-slow-verbosity=engine: - All engine calls in 'select' will be timed. - IO calls for InnoDB reads will be timed. - Incrementation of counters are done on local variables and accesses are inline, so these should have very little impact. - Statistics has to be reset for each statement for the THD and each used handler. This is only 40 bytes, which should be neglectable. - For partition tables we have to loop over all partitions to update the handler_status as part of table_init(). Can be optimized in the future to only do this is log-slow-verbosity changes. For this to work we have to update handler_status for all opened partitions and also for all partitions opened in the future. Other things: - Added options 'engine' and 'full' to log-slow-verbosity. - Some of the new files in the test suite comes from Percona server, which has similar status information. - buf_page_optimistic_get(): Do not increment any counter, since we are only validating a pointer, not performing any buf_pool.page_hash lookup. - Added THD argument to save_explain_data_intern(). - Switched arguments for save_explain_.*_data() to have always THD first (generates better code as other functions also have THD first).
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
#ifndef HA_HANDLER_STATS_INCLUDED
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#define HA_HANDLER_STATS_INCLUDED
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/*
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Copyright (c) 2023, MariaDB Foundation
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA
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*/
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/* Definitions for parameters to do with handler-routines */
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class ha_handler_stats
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{
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public:
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ulonglong pages_accessed; /* Pages accessed from page cache */
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ulonglong pages_updated; /* Pages changed in page cache */
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ulonglong pages_read_count; /* Pages read from disk */
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ulonglong pages_read_time; /* Time reading pages, in microsec. */
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ulonglong undo_records_read;
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ulonglong engine_time; /* Time spent in engine in microsec */
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uint active; /* <> 0 if status has to be updated */
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#define first_stat pages_accessed
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#define last_stat engine_time
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inline void reset()
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{
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bzero((void*) this, sizeof(*this));
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}
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inline void add(ha_handler_stats *stats)
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{
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ulonglong *to= &first_stat;
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ulonglong *from= &stats->first_stat;
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do
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{
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(*to)+= *from++;
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} while (to++ != &last_stat);
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}
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inline bool has_stats()
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{
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ulonglong *to= &first_stat;
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do
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{
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if (*to)
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return 1;
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} while (to++ != &last_stat);
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return 0;
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}
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};
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#endif /* HA_HANDLER_STATS_INCLUDED */
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