Nginx Can't handeled More Perl CGI concurrent Request

[Maxim Dounin]

Hello!

On Mon, Jun 27, 2016 at 01:36:50AM -0400, bhavik wrote:

> We are using Fastcgi module in nginx with perl.
> 
> We are trying to send 200 concurrent perl cgi request, but after increase
> the 250 concurrent request to specific script, We are getting below error in
> nginx log file.
> 
> [error] 23526#0: *3291 connect() to unix:/var/run/fcgiwrap.socket failed
> (11: Resource temporarily unavailable) while connecting to upstream, client:
> ::1, server: _, request: "POST /cgi-bin/example/example-xml.cgi HTTP/1.1",
> upstream: "fastcgi://unix:/var/run/fcgiwrap.socket:", host: "localhost"

The message indicate that listen queue of the backend socket is 
overflowed, your backend can't cope with load.  Make sure to tune 
your backend properly - number of processes and socket liste queue 
are most important things to consider.

Note well that if you are in fact using fcgiwrap as the socket 
name suggests, it's a wrong approach for a loaded server.  
Consider converting your scripts to use FastCGI directly instead.

[...]

-- 
Maxim Dounin
http://nginx.org/