Mercurial > hg > nginx-quic
view src/os/unix/ngx_pthread_thread.c @ 4667:d05ab8793a69 stable-1.2
Merge of r4622, r4623: balancing changes.
*) Upstream: smooth weighted round-robin balancing.
For edge case weights like { 5, 1, 1 } we now produce { a, a, b, a, c, a, a }
sequence instead of { c, b, a, a, a, a, a } produced previously.
Algorithm is as follows: on each peer selection we increase current_weight
of each eligible peer by its weight, select peer with greatest current_weight
and reduce its current_weight by total number of weight points distributed
among peers.
In case of { 5, 1, 1 } weights this gives the following sequence of
current_weight's:
a b c
0 0 0 (initial state)
5 1 1 (a selected)
-2 1 1
3 2 2 (a selected)
-4 2 2
1 3 3 (b selected)
1 -4 3
6 -3 4 (a selected)
-1 -3 4
4 -2 5 (c selected)
4 -2 -2
9 -1 -1 (a selected)
2 -1 -1
7 0 0 (a selected)
0 0 0
To preserve weight reduction in case of failures the effective_weight
variable was introduced, which usually matches peer's weight, but is
reduced temporarily on peer failures.
This change also fixes loop with backup servers and proxy_next_upstream
http_404 (ticket #47), and skipping alive upstreams in some cases if there
are multiple dead ones (ticket #64).
*) Upstream: fixed ip_hash rebalancing with the "down" flag.
Due to weight being set to 0 for down peers, order of peers after sorting
wasn't the same as without the "down" flag (with down peers at the end),
resulting in client rebalancing for clients on other servers. The only
rebalancing which should happen after adding "down" to a server is one
for clients on the server.
The problem was introduced in r1377 (which fixed endless loop by setting
weight to 0 for down servers). The loop is no longer possible with new
smooth algorithm, so preserving original weight is safe.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 04 Jun 2012 11:21:58 +0000 |
parents | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> static ngx_uint_t nthreads; static ngx_uint_t max_threads; static pthread_attr_t thr_attr; ngx_err_t ngx_create_thread(ngx_tid_t *tid, ngx_thread_value_t (*func)(void *arg), void *arg, ngx_log_t *log) { int err; if (nthreads >= max_threads) { ngx_log_error(NGX_LOG_CRIT, log, 0, "no more than %ui threads can be created", max_threads); return NGX_ERROR; } err = pthread_create(tid, &thr_attr, func, arg); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_create() failed"); return err; } ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, "thread is created: " NGX_TID_T_FMT, *tid); nthreads++; return err; } ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle) { int err; max_threads = n; err = pthread_attr_init(&thr_attr); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "pthread_attr_init() failed"); return NGX_ERROR; } err = pthread_attr_setstacksize(&thr_attr, size); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "pthread_attr_setstacksize() failed"); return NGX_ERROR; } ngx_threaded = 1; return NGX_OK; } ngx_mutex_t * ngx_mutex_init(ngx_log_t *log, ngx_uint_t flags) { int err; ngx_mutex_t *m; m = ngx_alloc(sizeof(ngx_mutex_t), log); if (m == NULL) { return NULL; } m->log = log; err = pthread_mutex_init(&m->mutex, NULL); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, m->log, err, "pthread_mutex_init() failed"); return NULL; } return m; } void ngx_mutex_destroy(ngx_mutex_t *m) { int err; err = pthread_mutex_destroy(&m->mutex); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, m->log, err, "pthread_mutex_destroy(%p) failed", m); } ngx_free(m); } void ngx_mutex_lock(ngx_mutex_t *m) { int err; if (!ngx_threaded) { return; } ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "lock mutex %p", m); err = pthread_mutex_lock(&m->mutex); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, m->log, err, "pthread_mutex_lock(%p) failed", m); ngx_abort(); } ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m); return; } ngx_int_t ngx_mutex_trylock(ngx_mutex_t *m) { int err; if (!ngx_threaded) { return NGX_OK; } ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "try lock mutex %p", m); err = pthread_mutex_trylock(&m->mutex); if (err == NGX_EBUSY) { return NGX_AGAIN; } if (err != 0) { ngx_log_error(NGX_LOG_ALERT, m->log, err, "pthread_mutex_trylock(%p) failed", m); ngx_abort(); } ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m); return NGX_OK; } void ngx_mutex_unlock(ngx_mutex_t *m) { int err; if (!ngx_threaded) { return; } ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "unlock mutex %p", m); err = pthread_mutex_unlock(&m->mutex); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, m->log, err, "pthread_mutex_unlock(%p) failed", m); ngx_abort(); } ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is unlocked", m); return; } ngx_cond_t * ngx_cond_init(ngx_log_t *log) { int err; ngx_cond_t *cv; cv = ngx_alloc(sizeof(ngx_cond_t), log); if (cv == NULL) { return NULL; } cv->log = log; err = pthread_cond_init(&cv->cond, NULL); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, cv->log, err, "pthread_cond_init() failed"); return NULL; } return cv; } void ngx_cond_destroy(ngx_cond_t *cv) { int err; err = pthread_cond_destroy(&cv->cond); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, cv->log, err, "pthread_cond_destroy(%p) failed", cv); } ngx_free(cv); } ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m) { int err; ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p wait", cv); err = pthread_cond_wait(&cv->cond, &m->mutex); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, cv->log, err, "pthread_cond_wait(%p) failed", cv); return NGX_ERROR; } ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p is waked up", cv); ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m); return NGX_OK; } ngx_int_t ngx_cond_signal(ngx_cond_t *cv) { int err; ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p to signal", cv); err = pthread_cond_signal(&cv->cond); if (err != 0) { ngx_log_error(NGX_LOG_ALERT, cv->log, err, "pthread_cond_signal(%p) failed", cv); return NGX_ERROR; } ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p is signaled", cv); return NGX_OK; }