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MDEV-14505 - Threads_running becomes scalability bottleneck

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Instead of updating global counter, calculate Threads_running on the fly.
All threads having command != COM_SLEEP are included.

Behaviour changes:

Previously SHOW STATUS and SHOW GLOBAL STATUS returned the same values
representing global status. Now SHOW STATUS always returns 1 indicating that
current session has 1 thread running.

Previously only threads that were executing dispatch_command() or running events
were accounted by Threads_running. Now it is rough equivalent of
SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE state!='Sleep'
This commit is contained in:
Sergey Vojtovich
2017-12-12 22:53:38 +04:00
parent 751e0f6b1e
commit 159a6c2e60
10 changed files with 44 additions and 23 deletions
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3
sql/sql_plugin.h
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@ -24,7 +24,8 @@
#define SHOW_always_last SHOW_KEY_CACHE_LONG, \
SHOW_LONG_STATUS, SHOW_DOUBLE_STATUS, \
SHOW_HAVE, SHOW_MY_BOOL, SHOW_HA_ROWS, SHOW_SYS, \
SHOW_LONG_NOFLUSH, SHOW_LONGLONG_STATUS, SHOW_LEX_STRING
SHOW_LONG_NOFLUSH, SHOW_LONGLONG_STATUS, SHOW_UINT32_STATUS, \
SHOW_LEX_STRING
#include "mariadb.h"
#undef SHOW_always_last