How come nginx is only accepting 1 connection?

[Roberto De Ioris]

Il giorno 18/gen/2011, alle ore 15.44, He Shiming ha scritto:

> Dear Nginx Community,
> 
> I'm trying to setup nginx with the pylons framework via uwsgi.
> Nginx-0.8.54 is compiled using:
> 
> ./configure --add-module=../nginx-upload-progress-module/
> --prefix=/mynginx-bin --with-http_ssl_module
> --add-module=../nginx_accept_language_module
> 
> And nginx.conf is:
> 
> worker_processes  1;
> daemon off;
> events {
>    worker_connections  1024;
> }
> http {
>    include       mime.types;
>    default_type  application/octet-stream;
>    upload_progress proxied 512m;
>    server {
>        listen 5002;
>        server_name localhost;
>        charset utf-8;
>        root /myproj/public;
>        index index.html;
>        client_max_body_size 2048m;
>        location / {
>            uwsgi_pass unix:/myproj/uwsgi.socket;
>            include	uwsgi_params;
>            uwsgi_param	SCRIPT_NAME /;
>            track_uploads proxied 30s;
>        }
>        location ^~ /upload_progress {
>            report_uploads proxied;
>        }
>    }
> }
> 
> You can see there I'm trying to create the ajax file uploader. UWSGI
> and pylons are the latest. UWSGI is using --paste parameter. I have to
> put in "daemon off;" because this is meant for development, and I'll
> have console interruption control.
> 
> I discovered that my nginx can only accept 1 connection at a time.
> When a large file is uploading, all ajax calls to /upload_progress are
> blocked. The requests are only answered after the upload is finished.
> Opening another tab for the file upload form will also be blocked
> until the upload finishes. It appears that nginx is throttling to
> process only 1 request at a time.
> 
> Why does this happen? Did I somehow touched some settings to cause this?
> 
> T

How many processes/workers have you setup in uWSGI ?

It look like you are running uWSGI with only one process (or thread, or async core)
add -p <n> and you should solve it

--
Roberto De Ioris
http://unbit.it