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MDEV-35720 Add query_time to statistics

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Added Query_time (total time spent running queries) to status_variables.

Other things:
- Added SHOW_MICROSECOND_STATUS type that shows an ulonglong variable
  in microseconds converted to a double (in seconds).
- Changed Busy_time and Cpu_time to use SHOW_MICROSECOND_STATUS, which
  simplified the code and avoids some double divisions for each query.

Reviewed-by: Sergei Golubchik <serg@mariadb.org>
This commit is contained in:
Monty
2024-12-27 19:26:55 +02:00
parent ed5bba8a32
commit 95975b921e
7 changed files with 99 additions and 9 deletions
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13
sql/sql_class.cc
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@@ -1419,7 +1419,10 @@ void THD::update_stats(void)
void THD::update_all_stats()
{
ulonglong end_cpu_time, end_utime;
double busy_time, cpu_time;
ulonglong busy_time, cpu_time;
status_var_add(status_var.query_time,
(utime_after_query - utime_after_lock));
/* This is set at start of query if opt_userstat_running was set */
if (!userstat_running)
@@ -1427,10 +1430,10 @@ void THD::update_all_stats()
end_cpu_time= my_getcputime();
end_utime= microsecond_interval_timer();
busy_time= (end_utime - start_utime) / 1000000.0;
cpu_time= (end_cpu_time - start_cpu_time) / 10000000.0;
busy_time= end_utime - start_utime;
cpu_time= end_cpu_time - start_cpu_time;
/* In case there are bad values, 2629743 is the #seconds in a month. */
if (cpu_time > 2629743.0)
if (cpu_time > 2629743000000ULL)
cpu_time= 0;
status_var_add(status_var.cpu_time, cpu_time);
status_var_add(status_var.busy_time, busy_time);
@@ -1853,6 +1856,7 @@ void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var)
to_var->table_open_cache_hits+= from_var->table_open_cache_hits;
to_var->table_open_cache_misses+= from_var->table_open_cache_misses;
to_var->table_open_cache_overflows+= from_var->table_open_cache_overflows;
to_var->query_time+= from_var->query_time;
/*
Update global_memory_used. We have to do this with atomic_add as the
@@ -1910,6 +1914,7 @@ void add_diff_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var,
dec_var->table_open_cache_misses;
to_var->table_open_cache_overflows+= from_var->table_open_cache_overflows -
dec_var->table_open_cache_overflows;
to_var->query_time+= from_var->query_time - dec_var->query_time;
/*
We don't need to accumulate memory_used as these are not reset or used by