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Cache the local server statistics object

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By storing the server statistics object in side the session, the lookup
involved in getting a worker-local value is avoided. Since the lookup is
done multiple times for a single query, it is beneficial to store it in
the session.

As the worker-local value is never deleted, it is safe to store a
reference to it in the session. It is also never updated concurrently so
no atomic operations are necessary.
This commit is contained in:
Markus Mäkelä
2018-12-09 15:01:52 +02:00
parent 1fa3b133c7
commit 9adbd2f8f0
6 changed files with 19 additions and 14 deletions
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9
server/modules/routing/readwritesplit/rwsplitsession.cc
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@ -45,6 +45,7 @@ RWSplitSession::RWSplitSession(RWSplit* instance,
, m_retry_duration(0)
, m_is_replay_active(false)
, m_can_replay_trx(true)
, m_server_stats(instance->local_server_stats())
{
if (m_config.rw_max_slave_conn_percent)
{
@ -84,7 +85,7 @@ RWSplitSession* RWSplitSession::create(RWSplit* router, MXS_SESSION* session)
for (auto& b : backends)
{
router->server_stats(b->server()).start_session();
rses->m_server_stats[b->server()].start_session();
}
}
}
@ -122,9 +123,9 @@ void RWSplitSession::close()
}
backend->response_stat().reset();
m_router->server_stats(backend->server()).end_session(backend->session_timer().split(),
backend->select_timer().total(),
backend->num_selects());
m_server_stats[backend->server()].end_session(backend->session_timer().split(),
backend->select_timer().total(),
backend->num_selects());
}
}