Current tip.
In Emperor mode I am running one vassal.
This is one application contained in one py file.
Is registered a signal that it is monitoring the py file and reload if change.
So restarts itself.
Very nice for development.

[uwsgi]
socket = /tmp/uwsgi/cos.sock
chdir = /cos
master = 1
processes = 1
single-interpreter = 1
module = start
logdate = %%Y-%%d-%%m %%H:%%M:%%S
disable-logging = 1
log-5xx = 1
vacuum = 1
harakiri = 3
reload-mercy = 3

After 20-30 minutes of work in this way (make changes and check results).
Receives in the logs:

2011-05-03 06:17:52 - spawned uWSGI worker 1 (pid: 5669, cores: 1)
2011-05-03 06:17:52 - added watch 1 for filename start.py
2011-05-03 06:18:04 - fmon check 9 == 9
2011-05-03 06:18:04 - inotify returned 1 items
2011-05-03 06:18:04 - fmon check 9 == 9
Sat Mar  5 06:18:04 2011 - master sent signal 1 to worker 1
2011-05-03 06:18:04 - inotify returned 1 items
Sat Mar  5 06:18:04 2011 - master sent signal 1 to worker 1
2011-05-03 06:18:04 - ...gracefully killing workers...
2011-05-03 06:18:04 - ...gracefully killing workers...
2011-05-03 06:18:04 - Gracefully killing worker 1 (pid: 5669)...
2011-05-03 06:18:05 - wait4() the spooler with pid 5668...2011-05-03 06:18:05 - 
done.2011-05-03 06:18:05 - binary reloading uWSGI...
2011-05-03 06:18:05 - closing all non-uwsgi socket fds > 2 (_SC_OPEN_MAX = 
1024)...
2011-05-03 06:18:05 - found fd 5
2011-05-03 06:18:05 - running /usr/sbin/uwsgi
*** has_emperor mode detected (fd: 7) ***
[uWSGI] getting INI configuration from cos.ini
2011-05-03 06:18:05 - *** Starting uWSGI 0.9.7-dev (32bit) on [Sat Mar  5 
06:18:05 2011] ***
2011-05-03 06:18:05 - compiled with version: 4.4.5 on 05 March 2011 03:03:14
2011-05-03 06:18:05 - your memory page size is 4096 bytes
2011-05-03 06:18:05 -  *** WARNING: you have enabled harakiri without post 
buffering. Slow upload could be rejected on post-unbuffered webservers *** 
2011-05-03 06:18:05 - uwsgi socket 0 inherited UNIX address /tmp/uwsgi/cos.sock 
fd 5
2011-05-03 06:18:05 - Python version: 2.6.6 (r266:84292, Sep 15 2010, 16:02:57) 
 [GCC 4.4.5]
2011-05-03 06:18:05 - Python main interpreter initialized at 0x9266f38
2011-05-03 06:18:05 - your server socket listen backlog is limited to 100 
connections
2011-05-03 06:18:05 - *** Operational MODE: single process ***
2011-05-03 06:18:07 - registered signal 1
2011-05-03 06:18:07 - WSGI application 0 (SCRIPT_NAME=) ready on interpreter 
0x9266f38 (default app)
2011-05-03 06:18:07 - gracefully (RE)spawned uWSGI master process (pid: 5212)
2011-05-03 06:18:07 - spawned the uWSGI spooler on dir /cos/data/spooler with 
pid 5676
2011-05-03 06:18:07 - lowering spooler priority to 20
2011-05-03 06:18:07 - spawned uWSGI worker 1 (pid: 5677, cores: 1)
2011-05-03 06:18:07 - added watch 1 for filename start.py
2011-05-03 06:18:15 - fmon check 9 == 9
2011-05-03 06:18:15 - inotify returned 1 items
Sat Mar  5 06:18:15 2011 - master sent signal 1 to worker 1
2011-05-03 06:18:15 - ...gracefully killing workers...
2011-05-03 06:18:15 - fmon check 9 == 9
2011-05-03 06:18:15 - inotify returned 1 items
2011-05-03 06:18:15 - Gracefully killing worker 1 (pid: 5677)...
2011-05-03 06:18:16 - wait4() the spooler with pid 5676...2011-05-03 06:18:16 - 
done.2011-05-03 06:18:16 - binary reloading uWSGI...
2011-05-03 06:18:16 - closing all non-uwsgi socket fds > 2 (_SC_OPEN_MAX = 
1024)...
2011-05-03 06:18:16 - found fd 5
2011-05-03 06:18:16 - running /usr/sbin/uwsgi
*** has_emperor mode detected (fd: 7) ***
[uWSGI] getting INI configuration from cos.ini
2011-05-03 06:18:16 - *** Starting uWSGI 0.9.7-dev (32bit) on [Sat Mar  5 
06:18:16 2011] ***
2011-05-03 06:18:16 - compiled with version: 4.4.5 on 05 March 2011 03:03:14
2011-05-03 06:18:16 - your memory page size is 4096 bytes
2011-05-03 06:18:16 -  *** WARNING: you have enabled harakiri without post 
buffering. Slow upload could be rejected on post-unbuffered webservers *** 
2011-05-03 06:18:16 - uwsgi socket 0 inherited UNIX address /tmp/uwsgi/cos.sock 
fd 5
2011-05-03 06:18:16 - Python version: 2.6.6 (r266:84292, Sep 15 2010, 16:02:57) 
 [GCC 4.4.5]
2011-05-03 06:18:16 - Python main interpreter initialized at 0x9c61f38
2011-05-03 06:18:16 - your server socket listen backlog is limited to 100 
connections
2011-05-03 06:18:16 - *** Operational MODE: single process ***
2011-05-03 06:18:18 - registered signal 1
2011-05-03 06:18:18 - WSGI application 0 (SCRIPT_NAME=) ready on interpreter 
0x9c61f38 (default app)
2011-05-03 06:18:18 - gracefully (RE)spawned uWSGI master process (pid: 5212)
2011-05-03 06:18:18 - spawned the uWSGI spooler on dir /cos/data/spooler with 
pid 5683
2011-05-03 06:18:18 - lowering spooler priority to 20
2011-05-03 06:18:18 - spawned uWSGI worker 1 (pid: 5684, cores: 1)
2011-05-03 06:18:18 - added watch 1 for filename start.py
2011-05-03 06:18:31 - fmon check 9 == 9
2011-05-03 06:18:31 - inotify returned 1 items
Sat Mar  5 06:18:31 2011 - master sent signal 1 to worker 1

Auto restart is no longer working.
What's more vassal not respond to the HUP signal.
Serves the request correctly, but you can kill it only after "kill -9".

--
Łukasz Wróblewski
http://www.nri.pl/ - Nowoczesne Rozwiązania Internetowe
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