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MDEV-17251 SHOW STATUS unnecessary calls calc_sum_of_all_status

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1. only call calc_sum_of_all_status() if a global
   SHOW_xxx_STATUS variable is to be returned
2. only lock LOCK_status when copying global_status_var,
   but not when iterating all threads
This commit is contained in:
Sergei Golubchik
2021-01-07 19:37:47 +01:00
parent 4c448836d4
commit 63f9192787
4 changed files with 16 additions and 11 deletions
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1
sql/sql_parse.cc
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@ -2179,6 +2179,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
break;
general_log_print(thd, command, NullS);
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
*current_global_status_var= global_status_var;
calc_sum_of_all_status(current_global_status_var);
if (!(uptime= (ulong) (thd->start_time - server_start_time)))
queries_per_second1000= 0;