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Core: idle connections now closed only once on exiting.

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Iterating through all connections takes a lot of CPU time, especially
with large number of worker connections configured.  As a result
nginx processes used to consume CPU time during graceful shutdown.
To mitigate this we now only do a full scan for idle connections when
shutdown signal is received.

Transitions of connections to idle ones are now expected to be
avoided if the ngx_exiting flag is set.  The upstream keepalive module
was modified to follow this.
This commit is contained in:
Valentin Bartenev
2015-08-11 16:28:55 +03:00
parent 9500e19919
commit 50ff8b3c3a
5 changed files with 31 additions and 35 deletions
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19
src/os/unix/ngx_process_cycle.c
View File

@@ -728,9 +728,6 @@ ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
{
ngx_int_t worker = (intptr_t) data;
ngx_uint_t i;
ngx_connection_t *c;
ngx_process = NGX_PROCESS_WORKER;
ngx_worker = worker;
@@ -741,19 +738,6 @@ ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
for ( ;; ) {
if (ngx_exiting) {
c = cycle->connections;
for (i = 0; i < cycle->connection_n; i++) {
/* THREAD: lock */
if (c[i].fd != -1 && c[i].idle) {
c[i].close = 1;
c[i].read->handler(c[i].read);
}
}
ngx_event_cancel_timers();
if (ngx_event_timer_rbtree.root == ngx_event_timer_rbtree.sentinel)
@@ -781,8 +765,9 @@ ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
ngx_setproctitle("worker process is shutting down");
if (!ngx_exiting) {
ngx_close_listening_sockets(cycle);
ngx_exiting = 1;
ngx_close_listening_sockets(cycle);
ngx_close_idle_connections(cycle);
}
}

22
src/os/win32/ngx_process_cycle.c
View File

@@ -761,10 +761,8 @@ failed:
static ngx_thread_value_t __stdcall
ngx_worker_thread(void *data)
{
ngx_int_t n;
ngx_uint_t i;
ngx_cycle_t *cycle;
ngx_connection_t *c;
ngx_int_t n;
ngx_cycle_t *cycle;
cycle = (ngx_cycle_t *) ngx_cycle;
@@ -780,19 +778,6 @@ ngx_worker_thread(void *data)
while (!ngx_quit) {
if (ngx_exiting) {
c = cycle->connections;
for (i = 0; i < cycle->connection_n; i++) {
/* THREAD: lock */
if (c[i].fd != (ngx_socket_t) -1 && c[i].idle) {
c[i].close = 1;
c[i].read->handler(c[i].read);
}
}
ngx_event_cancel_timers();
if (ngx_event_timer_rbtree.root
@@ -814,8 +799,9 @@ ngx_worker_thread(void *data)
ngx_quit = 0;
if (!ngx_exiting) {
ngx_close_listening_sockets(cycle);
ngx_exiting = 1;
ngx_close_listening_sockets(cycle);
ngx_close_idle_connections(cycle);
}
}