我一直遇到这样的错误，
[02-Jun-2012 01:52:04] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 19 idle, and 49 total children
[02-Jun-2012 01:52:05] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 19 idle, and 50 total children
[02-Jun-2012 01:52:06] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 19 idle, and 51 total children
[02-Jun-2012 03:10:51] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 18 idle, and 91 total children
我将php-fpm的设置更改为这些，
pm.max_children = 150 (It was at 100, i got a max_children reached and upped to 150)
pm.start_servers = 75
pm.min_spare_servers = 20
pm.max_spare_servers = 150
导致
[02-Jun-2012 01:39:19] WARNING: [pool www] server reached pm.max_children setting (150), consider raising it
我刚刚启动了一个新网站，该网站获得了可观的访问量。此流量是合法的，并且达到限制时，用户将收到504个网关超时。
我使用IPTABLES与服务器的连接受到限制，并且正在运行fail2ban并跟踪nginx访问日志。流量是合法的，我的用户空间不足。
我目前在使用ubuntu 64位的双核处理器上运行。
free
total used free shared buffers cached
Mem: 6114284 5726984 387300 0 141612 4985384
-/+ buffers/cache: 599988 5514296
Swap: 524284 5804 518480
我的php.ini max_input_time = 60
我的nginx配置是
worker_processes 4;
pid /var/run/nginx.pid;
events {
worker_connections 19000;
# multi_accept on;
}
worker_rlimit_nofile 20000; #each connection needs a filehandle (or 2 if you are proxying)
client_max_body_size 30M;
client_body_timeout 10;
client_header_timeout 10;
keepalive_timeout 5 5;
send_timeout 10;
location ~ \.php$ {
try_files $uri /er/error.php;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 256 16k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_max_temp_file_size 0;
fastcgi_intercept_errors on;
fastcgi_pass unix:/tmp/php5-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
}
我该怎么做才能停止用尽连接？为什么这种情况不断发生？我正在实时监控Google Analytics（分析）上的流量，当用户数超过120时，我的php-fpm.log充满了这些警告。