Nginx config - 904k http req/sec

#----------------------------------------------------------------------
# Main Module - directives that cover basic functionality
#----------------------------------------------------------------------

user              nginx;

# This number should be, at maximum, the number of CPU cores on your system.
# (since  nginx doesn't benefit from more than one worker per CPU.)
worker_processes 24;

# Number of file descriptors used for Nginx. This is set in the OS with 'ulimit -n 200000'
worker_rlimit_nofile 200000;

#error_log  /var/log/nginx/error.log;
error_log  /dev/null crit;
pid        /var/run/nginx.pid;

#----------------------------------------------------------------------
# Events Module
#----------------------------------------------------------------------

events {
    # determines how many clients will be served by each worker process.
    # (Max clients = worker_connections * worker_processes)
    worker_connections  45000;

    # essential for linux, optmized to serve many clients with each thread
    use epoll;

    # accept as many connections as possible, after nginx gets notification about a new connection.
    # May flood worker_connections, if that option is set too low.
     multi_accept on;
}

 #----------------------------------------------------------------------
 # HTTP Core Module
 #----------------------------------------------------------------------

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

      # caches information about open FDs and freqently accessed files
      open_file_cache max=200000 inactive=20s;
      open_file_cache_valid    30s;
      open_file_cache_min_uses 2;
      open_file_cache_errors   on;

     # Buffer log writes to speed up IO.
     #access_log /var/log/nginx/access.log main buffer=16k;
     access_log off;

     # Sendfile copies data between one FD and other from within the kernel.
     # More efficient than read() + write(), since the requires transferring data to and from the user space.
     # Tcp_nopush causes nginx to attempt to send its HTTP response head in one packet,
     # instead of using partial frames. This is useful for prepending headers before calling sendfile,
     # or for throughput optimization.
     sendfile      on;
     tcp_nopush    on;

     # -- keep-alive options --#

     # don't buffer data-sends (disable Nagle algorithm). Good for sending frequent small bursts of data in real time.
     tcp_nodelay on;

     # Timeout for keep-alive connections. Server will close connections after this time.
     keepalive_timeout 30;

     # Number of requests a client can make over the keep-alive connection.
     keepalive_requests 100000;

     # -- Timeouts -- #

     # allow the server to close the connection after a client stops responding. Frees up socket-associated memory.
     # Does not apply
     reset_timedout_connection on;

     # send the client a "request timed out" if the body is not loaded by this time. Default 60.
     client_body_timeout   10;

     # If the client stops reading data, free up the stale client connection after this much time. Default 60.
     send_timeout          2;

     # Compression. Useful for cutting down on network traffic
     gzip on;
     gzip_min_length 10240;
     gzip_proxied expired no-cache no-store private auth;
     gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml;
     gzip_disable "MSIE [1-6]\.";

    # -- The default server -- #
    server {
        listen       80;
        server_name  _;

    location / {
            root   /usr/share/nginx/html;
            index  index.html index.htm;
        }

     error_page  404              /404.html;
        location = /404.html {
            root   /usr/share/nginx/html;
        }

        # redirect server error pages to the static page /50x.html
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   /usr/share/nginx/html;
        }

    }

    # Load config files from the /etc/nginx/conf.d directory
    #include /etc/nginx/conf.d/*.conf;
}