How To Tuning the performance NGINX - php-fpm

Hi @ all,

i don't know how to tuning the performance about my web servers…

i have 2 linode 1024 balanced with LinodeBalancer, serving a website with a high traffic.

configured like this :

NodeBalancers :

Algorithm = leastConnection

Session Stickiness = Table

two web servers :

Ubuntu 10.04 32Bit (Linode Kernel 3.2.1-linode40)
nginx version: nginx/1.0.11
PHP 5.3.5-1ubuntu7.2ppa1~lucid with Suhosin-Patch 
php-apc module enabled.
php5-fpm

all this packets was installed from the ppa :

ppa:nginx/stable
ppa:nginx/php5

nginx is configured like this :

user www-data;
  worker_processes  4;
  worker_rlimit_nofile 32768;
  error_log  /var/log/nginx/error.log;
  pid        /var/run/nginx.pid;
  events {
      worker_connections  4096;
      multi_accept on;
      accept_mutex_delay 50ms;
  }
http {
    tcp_nodelay        on;
    expires -1;
    server_tokens off;
    sendfile on;
    tcp_nopush on;
    keepalive_timeout 60 60;
    types_hash_max_size 2048;
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;
    map $scheme $server_https {
        default off;
        https on;
    }
    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}

php-fpm :

[www]
listen = /etc/php5/php5-fpm.sock
user = www-data
group = www-data
pm = dynamic
pm.max_children = 8
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
pm.max_requests = 1000
request_terminate_timeout = 30s
#request_slowlog_timeout = 1s
#slowlog = /var/log/php5-fpm/$pool.log.slow
rlimit_files = 32768
rlimit_core = unlimited
chdir = /

and the website is configured like this :

server {
    server_name webdomain.org;
    listen   80; ## listen for ipv4; this line is default and implied
    access_log  /var/log/nginx/web_access.log combined  buffer=32k;
    error_log   /var/log/nginx/web_error.log info;
    root /home/web/;

    index index.php index.html index.htm;

    try_files $uri $uri/ @rewrite;

    location @rewrite {
        rewrite ^/(.*)$ /index.php/$1;
    }
    location ~ \.php {
        # try_files $uri =404;
        #auth_basic            "Restricted";
        #auth_basic_user_file  /etc/nginx/htpasswd;

        fastcgi_index index.php;
        fastcgi_pass   backend;

        include fastcgi_params;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }

    location ~ /\.ht {
        deny all;
    }
}
upstream backend {
        server unix:/etc/php5/php5-fpm.sock;
}

this configuration is the same in the web server no.2

i'm trying to test the website with ab and this is the results :

ab -n 50000 -c 1000 http://localhost/

Server Software:        nginx
Server Hostname:        localhost
Server Port:            80

Document Path:          /en
Document Length:        188 bytes

Concurrency Level:      1000
Time taken for tests:   7.112 seconds
Complete requests:      50000
Failed requests:        0
Write errors:           0
Non-2xx responses:      50296
Total transferred:      19011888 bytes
HTML transferred:       9455648 bytes
Requests per second:    7030.27 [#/sec] (mean)
Time per request:       142.242 [ms] (mean)
Time per request:       0.142 [ms] (mean, across all concurrent requests)
Transfer rate:          2610.52 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       28   60  11.1     60     108
Processing:    36   80  16.4     80     155
Waiting:       25   61  16.5     60     121
Total:         90  141  14.2    140     203

Percentage of the requests served within a certain time (ms)
  50%    140
  66%    146
  75%    150
  80%    152
  90%    159
  95%    164
  98%    173
  99%    182
 100%    203 (longest request)

from this output is not bad, (i think) but if i test the website with loadimpact i have a bad bad bad result.

500 concurrent connection in 10 minutes :

~~http://i42.tinypic.com/vnzdhh.png" />

i don't know where to begin.

any help is very very appreciated!

Thanks~~