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MDEV-7952 - clock_gettime() takes 0.24% in OLTP RO

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Initialize abs_timeout when it is about to be used. This saves one my_hrtime()
call on hot path (when we acquire MDL lock without waiting).

When filling I_S.PROCESSLIST use THD::start_utime/THD::utime_after_query instead
of THD::start_time. This allows us to save 2 clock_gettime() calls.

Overhead change:
__clock_gettime   0.13% -> 0.11% (122 -> 76 calls per OLTP RO transaction)
my_interval_timer 0.07% -> 0.06%
my_hrtime         0.04% -> 0.01%
This commit is contained in:
Sergey Vojtovich
2015-06-17 18:55:38 +04:00
parent 2bc6e29afe
commit 8f603bcbca
4 changed files with 18 additions and 16 deletions
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sql/sql_parse.cc
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@ -1943,7 +1943,6 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
thd->m_statement_psi= NULL;
thd->m_digest= NULL;
thd->set_time();
dec_thread_running();
thd->packet.shrink(thd->variables.net_buffer_length); // Reclaim some memory
free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));