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MDEV-7899: 10.1 is 3% slower than 10.0 in OLTP RO

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- 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.
This commit is contained in:
Sergei Petrunia
2015-04-07 01:29:17 +03:00
parent 2936fb127d
commit 2af935c8ec
10 changed files with 105 additions and 70 deletions
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10
sql/sql_update.cc
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@ -517,7 +517,9 @@ int mysql_update(THD *thd,
*/
if (thd->lex->describe)
goto produce_explain_and_leave;
query_plan.save_explain_data(thd->mem_root, thd->lex->explain);
explain= query_plan.save_explain_update_data(thd->mem_root, thd);
ANALYZE_START_TRACKING(&explain->command_tracker);
DBUG_EXECUTE_IF("show_explain_probe_update_exec_start",
dbug_serve_apcs(thd, 1););
@ -721,7 +723,6 @@ int mysql_update(THD *thd,
if (table->file->ha_table_flags() & HA_PARTIAL_COLUMN_READ)
table->prepare_for_position();
explain= thd->lex->explain->get_upd_del_plan();
table->reset_default_fields();
/*
@ -731,7 +732,6 @@ int mysql_update(THD *thd,
*/
can_compare_record= records_are_comparable(table);
explain->tracker.on_scan_init();
ANALYZE_START_TRACKING(&explain->time_tracker);
while (!(error=info.read_record(&info)) && !thd->killed)
{
@ -908,7 +908,7 @@ int mysql_update(THD *thd,
break;
}
}
ANALYZE_STOP_TRACKING(&explain->time_tracker);
ANALYZE_STOP_TRACKING(&explain->command_tracker);
table->auto_increment_field_not_null= FALSE;
dup_key_found= 0;
/*
@ -1046,7 +1046,7 @@ produce_explain_and_leave:
We come here for various "degenerate" query plans: impossible WHERE,
no-partitions-used, impossible-range, etc.
*/
query_plan.save_explain_data(thd->mem_root, thd->lex->explain);
query_plan.save_explain_update_data(thd->mem_root, thd);
emit_explain_and_leave:
int err2= thd->lex->explain->send_explain(thd);