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2af935c8ec
- Remove ANALYZE's timing code off the the execution path of regular SELECTs. - Improve the tracker that tracks counts/execution times of SELECTs or DML statements: = regular execution just increments counters = ANALYZE will also collect timings.
89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
/*
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Copyright (c) 2015 MariaDB Corporation Ab
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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A class for tracking time it takes to do a certain action
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*/
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class Exec_time_tracker
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{
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protected:
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ulonglong count;
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ulonglong cycles;
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ulonglong last_start;
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public:
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Exec_time_tracker() : count(0), cycles(0) {}
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// interface for collecting time
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void start_tracking()
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{
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last_start= my_timer_cycles();
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}
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void stop_tracking()
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{
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count++;
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cycles += my_timer_cycles()- last_start;
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}
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// interface for getting the time
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ulonglong get_loops() { return count; }
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double get_time_ms()
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{
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// convert 'cycles' to milliseconds.
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return 1000 * ((double)cycles) / sys_timer_info.cycles.frequency;
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}
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};
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/*
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A class for counting certain actions (in all queries), and optionally
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collecting the timings (in ANALYZE queries).
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*/
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class Time_and_counter_tracker: public Exec_time_tracker
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{
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public:
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const bool timed;
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Time_and_counter_tracker(bool timed_arg) : timed(timed_arg)
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{}
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/* Loops are counted in both ANALYZE and regular queries, as this is cheap */
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void incr_loops() { count++; }
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/*
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Unlike Exec_time_tracker::stop_tracking, we don't increase loops.
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*/
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void stop_tracking()
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{
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cycles += my_timer_cycles()- last_start;
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}
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};
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#define ANALYZE_START_TRACKING(tracker) \
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{ \
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(tracker)->incr_loops(); \
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if (unlikely((tracker)->timed)) \
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{ (tracker)->start_tracking(); } \
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}
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#define ANALYZE_STOP_TRACKING(tracker) \
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if (unlikely((tracker)->timed)) \
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{ (tracker)->stop_tracking(); }
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