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Changing worker selection precedence.

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This patch increase precedence of non-started worker over busy worker.

1. idle worker;
2. start new worker;
3. busy worker, but can accept request in advance;
This commit is contained in:
Max Romanov
2017-12-27 17:46:39 +03:00
parent 89c0f7c5db
commit ab138c9166
2 changed files with 48 additions and 23 deletions
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69
src/nxt_router.c
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@@ -2519,6 +2519,19 @@ nxt_router_app_use(nxt_task_t *task, nxt_app_t *app, int i)
}
nxt_inline nxt_bool_t
nxt_router_app_first_port_busy(nxt_app_t *app)
{
nxt_port_t *port;
nxt_queue_link_t *lnk;
lnk = nxt_queue_first(&app->ports);
port = nxt_queue_link_data(lnk, nxt_port_t, app_link);
return port->app_pending_responses > 0;
}
nxt_inline nxt_port_t *
nxt_router_app_get_port_unsafe(nxt_app_t *app, int *use_delta)
{
@@ -2530,12 +2543,10 @@ nxt_router_app_get_port_unsafe(nxt_app_t *app, int *use_delta)
port = nxt_queue_link_data(lnk, nxt_port_t, app_link);
port->app_requests++;
port->app_pending_responses++;
if (app->live &&
(app->max_pending_responses == 0 ||
(port->app_requests - port->app_responses) <
app->max_pending_responses) )
if (app->max_pending_responses == 0
|| port->app_pending_responses < app->max_pending_responses)
{
nxt_queue_insert_tail(&app->ports, lnk);
@@ -2560,7 +2571,7 @@ nxt_router_app_get_idle_port(nxt_app_t *app)
nxt_queue_each(port, &app->ports, nxt_port_t, app_link) {
if (port->app_requests > port->app_responses) {
if (port->app_pending_responses > 0) {
port = NULL;
continue;
@@ -2618,18 +2629,32 @@ nxt_router_app_port_release(nxt_task_t *task, nxt_port_t *port,
nxt_thread_mutex_lock(&app->mutex);
port->app_requests -= request_failed;
port->app_pending_responses -= request_failed + got_response;
port->app_responses += got_response;
if (app->live != 0 &&
port->pair[1] != -1 &&
port->app_link.next == NULL &&
(app->max_pending_responses == 0 ||
(port->app_requests - port->app_responses) <
app->max_pending_responses) )
(app->max_pending_responses == 0
|| port->app_pending_responses < app->max_pending_responses))
{
nxt_queue_insert_tail(&app->ports, &port->app_link);
use_delta++;
if (port->app_link.next == NULL) {
if (port->app_pending_responses > 0) {
nxt_queue_insert_tail(&app->ports, &port->app_link);
} else {
nxt_queue_insert_head(&app->ports, &port->app_link);
}
use_delta++;
} else {
if (port->app_pending_responses == 0
&& nxt_queue_first(&app->ports) != &port->app_link)
{
nxt_queue_remove(&port->app_link);
nxt_queue_insert_head(&app->ports, &port->app_link);
}
}
}
if (app->live != 0 &&
@@ -2650,7 +2675,7 @@ nxt_router_app_port_release(nxt_task_t *task, nxt_port_t *port,
ra_use_delta = 0;
}
send_quit = app->live == 0 && port->app_requests == port->app_responses;
send_quit = app->live == 0 && port->app_pending_responses > 0;
nxt_thread_mutex_unlock(&app->mutex);
@@ -2750,7 +2775,6 @@ nxt_router_app_port(nxt_task_t *task, nxt_req_app_link_t *ra)
nxt_event_engine_t *engine;
nxt_socket_conf_joint_t *joint;
port = NULL;
use_delta = 1;
c = ra->rc->conn;
@@ -2776,27 +2800,28 @@ nxt_router_app_port(nxt_task_t *task, nxt_req_app_link_t *ra)
nxt_timer_add(engine, &c->read_timer, app->timeout);
}
can_start_worker = 0;
nxt_thread_mutex_lock(&app->mutex);
if (!nxt_queue_is_empty(&app->ports)) {
port = nxt_router_app_get_port_unsafe(app, &use_delta);
can_start_worker = (app->workers + app->pending_workers)
< app->max_workers;
} else {
if (nxt_queue_is_empty(&app->ports)
|| (can_start_worker && nxt_router_app_first_port_busy(app)) )
{
ra = nxt_router_ra_create(task, ra);
if (nxt_fast_path(ra != NULL)) {
nxt_queue_insert_tail(&app->requests, &ra->link);
can_start_worker = (app->workers + app->pending_workers) <
app->max_workers;
if (can_start_worker) {
app->pending_workers++;
}
}
port = NULL;
} else {
port = nxt_router_app_get_port_unsafe(app, &use_delta);
}
nxt_thread_mutex_unlock(&app->mutex);