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Make connect speed great again
Rather than parsing session_track_system_variables when thread starts, do it when first trackable event occurs. Benchmarked on a 2socket/20core/40threads Broadwell system using sysbench connect brencmark @40 threads (with select 1 disabled): 101379.77 -> 143016.68 CPS, whereas 10.2 is currently at 137766.31 CPS. Part of MDEV-14984 - regression in connect performance
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@ -7903,6 +7903,7 @@ MYSQL_BIN_LOG::trx_group_commit_leader(group_commit_entry *leader)
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*/
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for (current= queue; current != NULL; current= current->next)
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{
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set_current_thd(current->thd);
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binlog_cache_mngr *cache_mngr= current->cache_mngr;
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/*
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@ -7938,6 +7939,7 @@ MYSQL_BIN_LOG::trx_group_commit_leader(group_commit_entry *leader)
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cache_mngr->delayed_error= false;
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}
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}
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set_current_thd(leader->thd);
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bool synced= 0;
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if (unlikely(flush_and_sync(&synced)))
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@ -379,16 +379,10 @@ void Session_sysvars_tracker::deinit(THD *thd)
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bool Session_sysvars_tracker::enable(THD *thd)
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{
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LEX_STRING tmp= { thd->variables.session_track_system_variables,
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safe_strlen(thd->variables.session_track_system_variables) };
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orig_list.reinit();
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if (orig_list.parse_var_list(thd, tmp, true, thd->charset()) == true)
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{
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orig_list.reinit();
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m_enabled= false;
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return true;
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}
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m_enabled= true;
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m_parsed= false;
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m_enabled= thd->variables.session_track_system_variables &&
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*thd->variables.session_track_system_variables;
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return false;
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}
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@ -433,6 +427,7 @@ bool Session_sysvars_tracker::update(THD *thd, set_var *var)
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my_free(thd->variables.session_track_system_variables);
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thd->variables.session_track_system_variables= static_cast<char*>(copy);
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m_parsed= true;
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orig_list.copy(&tool_list, thd);
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orig_list.construct_var_list(thd->variables.session_track_system_variables,
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var->save_result.string_value.length + 1);
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@ -540,6 +535,20 @@ void Session_sysvars_tracker::mark_as_changed(THD *thd,
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{
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sysvar_node_st *node;
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sys_var *svar= (sys_var *)var;
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if (!m_parsed)
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{
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DBUG_ASSERT(thd->variables.session_track_system_variables);
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LEX_STRING tmp= { thd->variables.session_track_system_variables,
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strlen(thd->variables.session_track_system_variables) };
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if (orig_list.parse_var_list(thd, tmp, true, thd->charset()))
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{
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orig_list.reinit();
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return;
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}
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m_parsed= true;
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}
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/*
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Check if the specified system variable is being tracked, if so
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mark it as changed and also set the class's m_changed flag.
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@ -198,6 +198,7 @@ class Session_sysvars_tracker: public State_tracker
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various operations.
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*/
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vars_list orig_list;
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bool m_parsed;
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public:
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void init(THD *thd);
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@ -7304,6 +7304,7 @@ void THD::set_last_commit_gtid(rpl_gtid >id)
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#ifndef EMBEDDED_LIBRARY
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if (changed_gtid && session_tracker.sysvars.is_enabled())
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{
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DBUG_ASSERT(current_thd == this);
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session_tracker.sysvars.
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mark_as_changed(this, (LEX_CSTRING*)Sys_last_gtid_ptr);
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}
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