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Make connect speed great again

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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
This commit is contained in:
Sergey Vojtovich
2019-03-20 01:32:10 +04:00
parent 1b5cf2f7e7
commit 53671a1fff
4 changed files with 22 additions and 9 deletions
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sql/sql_class.cc
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@ -7304,6 +7304,7 @@ void THD::set_last_commit_gtid(rpl_gtid &gtid)
#ifndef EMBEDDED_LIBRARY
if (changed_gtid && session_tracker.sysvars.is_enabled())
{
DBUG_ASSERT(current_thd == this);
session_tracker.sysvars.
mark_as_changed(this, (LEX_CSTRING*)Sys_last_gtid_ptr);
}