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MDEV-14984 - regression in connect performance

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Removed redundant plugin_thdvar_cleanup() from end_connection(): called by
THD::free_connection(), which always follows end_connection().

Saves at least one lock(LOCK_plugin) and one
rdlock(LOCK_system_variables_hash).

Benchmarked on a 2socket/20core/40threads Broadwell system using sysbench
connect brencmark @40 threads (with select 1 disabled).

10.2 shows moderate improvement: 136219.93 -> 137766.31 CPS.
10.3 is improvement is somewhat better: 93018.29 -> 101379.77 CPS.

Also backported MyRocks memory leak fix from 10.4, which turned out to
be unrelated.
This commit is contained in:
Sergey Vojtovich
2019-03-13 06:02:08 +04:00
parent aa6058469e
commit 20928e2e96
3 changed files with 2 additions and 3 deletions
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1
sql/sql_connect.cc
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@ -1122,7 +1122,6 @@ void end_connection(THD *thd)
}
thd->wsrep_client_thread= 0;
#endif
plugin_thdvar_cleanup(thd);
if (thd->user_connect)
{