[squid-users] questions with squid-3.1

I just downloaded squid-3.1 source and compile && install it on an
ubuntu linux box.
There are two questions around it:

1. # sbin/squid -k kill
squid: ERROR: No running copy

Though squid is running there, but squid -k kill shows "No running copy".
I think this is because squid can't find its pid file, so where is
the default pid file?

2. # sbin/squid -D
2010/02/16 15:02:41| WARNING: -D command-line option is obsolete.

-D is obsolete, why and what's the corresponding one to this option in
squid-3.1?

Thanks.

-- 
Jeff Peng
Email: jeffpeng_at_netzero.net
Skype: compuperson