Cardoe was complaining that repeatedly hitting the Gentoo CVS server was too slow, and it turned out he wasn't using SSH ControlMaster at all. Other developers have blogged about it before, but here is a quick reminder how.
Without ControlMaster, running "time ssh email@example.com w" shows a turnaround of 1.9 seconds. With ControlMaster, It's more in the range of 0.07-0.09 seconds :-).~/.ssh/config:
Host master-cvs.gentoo.org HostName cvs.gentoo.org User robbat2 ControlMaster yes ControlPath ~/.ssh/master-%l-%h-%p-%r.sock Host cvs.gentoo.org ControlMaster no ControlPath ~/.ssh/master-%l-%h-%p-%r.sock BatchMode yesSetup Usage:
ssh -f -n -N master-cvs.gentoo.org
Now just do anything like you would normally. For security, you should probably close the ControlMaster session if you're going away from your machine for a long time. It would be nice to detect the loss of the ControlMaster and re-initiate it always at the start of a sequence.