Subject: Re: cp(1) vs. UVM/UBC
To: None <firstname.lastname@example.org>
From: Matthias Buelow <email@example.com>
Date: 07/21/2001 18:21:04
Matthias Scheler writes:
>He is talking about smart userland code. "cp" e.g. would simply use the
>old read(2) loop in this case.
Does mmapping a file for copying instead of simply reading it really
pay off that much that it justifies complicating a silly little command
like cp, and a long thread here? I would've thought that in a near
100% of all situations, cp was i/o (read: disk/network) bound, and the
extra kernel->userland copy was totally insignificant.