“OpenSSH 4.0 introduced an interesting new feature called ControlMaster that allows it to reuse an existing connection to a remote host when opening new connections to that host. This can significantly reduce the amount of time it takes to establish connections after the initial connection. Let’s see how this can help you work faster, and how to start using ControlMaster right away.”
As the article discusses, I tried timing 10 calls to
ssh my-host hostname
First without ControlMaster and then with it. The results:
- No ControlMaster – 0.218 user
- ControlMaster – 0.038 user
Yozaa. I haven’t been tramping with it so I’m not sure how this will translate to my day-to-day. Still, I have hope.