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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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16
sql/sql_select.cc
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@ -23441,8 +23441,11 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
tab->tracker= &eta->tracker;
tab->jbuf_tracker= &eta->jbuf_tracker;
tab->table->file->tracker= &eta->op_tracker;
/* id and select_type are kept in Explain_select */
/* Enable the table access time tracker only for "ANALYZE stmt" */
if (thd->lex->analyze_stmt)
tab->table->file->tracker= &eta->op_tracker;
/* No need to save id and select_type here, they are kept in Explain_select */
/* table */
if (table->derived_select_number)
@ -23864,12 +23867,15 @@ int JOIN::save_explain_data_intern(Explain_query *output, bool need_tmp_table,
if (message)
{
Explain_select *xpl_sel;
explain_node= xpl_sel= new (output->mem_root) Explain_select(output->mem_root);
explain_node= xpl_sel=
new (output->mem_root) Explain_select(output->mem_root,
thd->lex->analyze_stmt);
join->select_lex->set_explain_type(true);
xpl_sel->select_id= join->select_lex->select_number;
xpl_sel->select_type= join->select_lex->type;
xpl_sel->message= message;
tracker= &xpl_sel->time_tracker;
if (select_lex->master_unit()->derived)
xpl_sel->connection_type= Explain_node::EXPLAIN_NODE_DERIVED;
/* Setting xpl_sel->message means that all other members are invalid */
@ -23878,7 +23884,9 @@ int JOIN::save_explain_data_intern(Explain_query *output, bool need_tmp_table,
else
{
Explain_select *xpl_sel;
explain_node= xpl_sel= new (output->mem_root) Explain_select(output->mem_root);
explain_node= xpl_sel=
new (output->mem_root) Explain_select(output->mem_root,
thd->lex->analyze_stmt);
table_map used_tables=0;
tracker= &xpl_sel->time_tracker;