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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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23
sql/sql_delete.cc
View File

@ -52,9 +52,11 @@
invoked on a running DELETE statement.
*/
void Delete_plan::save_explain_data(MEM_ROOT *mem_root, Explain_query *query)
Explain_delete* Delete_plan::save_explain_delete_data(MEM_ROOT *mem_root, THD *thd)
{
Explain_delete *explain= new (mem_root) Explain_delete(mem_root);
Explain_query *query= thd->lex->explain;
Explain_delete *explain=
new (mem_root) Explain_delete(mem_root, thd->lex->analyze_stmt);
if (deleting_all_rows)
{
@ -69,14 +71,19 @@ void Delete_plan::save_explain_data(MEM_ROOT *mem_root, Explain_query *query)
}
query->add_upd_del_plan(explain);
return explain;
}
void Update_plan::save_explain_data(MEM_ROOT *mem_root, Explain_query *query)
Explain_update*
Update_plan::save_explain_update_data(MEM_ROOT *mem_root, THD *thd)
{
Explain_update* explain= new (mem_root) Explain_update(mem_root);
Explain_query *query= thd->lex->explain;
Explain_update* explain=
new (mem_root) Explain_update(mem_root, thd->lex->analyze_stmt);
save_explain_data_intern(mem_root, query, explain);
query->add_upd_del_plan(explain);
return explain;
}
@ -461,7 +468,8 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
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_delete_data(thd->mem_root, thd);
ANALYZE_START_TRACKING(&explain->command_tracker);
DBUG_EXECUTE_IF("show_explain_probe_delete_exec_start",
dbug_serve_apcs(thd, 1););
@ -542,7 +550,6 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
explain= (Explain_delete*)thd->lex->explain->get_upd_del_plan();
explain->tracker.on_scan_init();
ANALYZE_START_TRACKING(&explain->time_tracker);
while (!(error=info.read_record(&info)) && !thd->killed &&
! thd->is_error())
@ -620,7 +627,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
end_read_record(&info);
if (options & OPTION_QUICK)
(void) table->file->extra(HA_EXTRA_NORMAL);
ANALYZE_STOP_TRACKING(&explain->time_tracker);
ANALYZE_STOP_TRACKING(&explain->command_tracker);
cleanup:
/*
@ -701,7 +708,7 @@ 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_delete_data(thd->mem_root, thd);
send_nothing_and_leave:
/*