Re: FastCGI daemon

[Jacob Jay <jacob@...>]

On 23 Oct 2009, at 8:25 PM, Bertrand Mansion wrote:

> I'd be interested in seeing how you start spawn-fcgid with wsapi-fcgi,

Sure; this is by no means a complete example, but it's most of what's  
relevant. Note that there's two files with the name wsapi.fcgi,  
typically (using luarocks) you'd spawn with the shell script in lib/ 
bin or thereabouts. In my setup I actually pass launch arguments via  
wsapi.fcgi, through the wsapi_env to the webapp so that each server  
[process] knows which it is (most folks probably wouldn't need this),  
and thus I use a modified version of the Lua script of the same name  
(having «function wsapi_loader»).

It seems best (and makes sense) to have as many fastcgi servers as you  
have CPU cores (of course shared memory/data access may then become an  
issue). In my usage under Ubuntu, no single fastcgi server seems  
capable of using more than 30% of a core (and webserver 40-50% of a  
core), and adding additional servers doesn't make better use of the  
CPU...


-- spawn-fcgi

spawn-fcgi -s /tmp/1.fcgi.socket -- wsapi.fcgi &
spawn-fcgi -s /tmp/2.fcgi.socket -- wsapi.fcgi &

-- nginx

http {
 upstream wsapi {
       server unix:/tmp/1.fcgi.socket;
       server unix:/tmp/2.fcgi.socket; }
 server {
	location /static/ {
		root /var/www; }
       location /favicon.ico {
		alias /var/www/static/favicon.ico; }
	location / {
           	fastcgi_pass wsapi;
           	include fastcgi_params; }
	}
}

-- lighttpd

server.modules += ( "mod_rewrite" )
url.rewrite-once = (
	"^/robots.txt" => "/static/robots.txt",
	"^/favicon.ico" => "/static/favicon.ico",
	"^/static/(.*)$" => "/static/$1",
	"^/(.*)" => "/wsapi.fcgi/$1",
)
server.modules += ( "mod_fastcgi" )
fastcgi.server = ( "/wsapi.fcgi" => (
 (	"socket" => "/tmp/1.fcgi.socket",
	"check-local" => "disable" ),
 (	"socket" => "/tmp/2.fcgi.socket",
	"check-local" => "disable" ),
))

If you use bin-path and max-procs for each fastcgi server you can  
achieve better load handling, however this is being depreciated (and  
makes it impossible to pass launch args).