When I run `sudo su` on my ubuntu, there is a large delay (wait time of some sort).
`sudo su && strace -Tr -o sudo.strace sudo su` told me (almost) everything I needed:
- `sudo su` to become effective UID 0 (root)
- strace - a tool which allows you digging into the running application
- options Tr... trace options
- -o to save output into sudo.strace file
- last `sudo su` is the command to trace
The output I got had this:
0.000023 sendmmsg(4, [{...
0.000069 poll(...) <2 .059095="">
2.059222 ioctl(4, FIONREAD, [106]) = 0 0 .000076=""
0.000187 recvfrom(4, ... inet_addr("1.2.3.4")}, [28->16]) = 106 0.000075=""
The `sudo` was trying to query some network address.
Check in /etc showed that I had a strange nameserver added to /etc/ppp/resolv.conf. I have removed that.
To further improve the performance I'll need to check other requests as well. And possibly understand why the heck sudo is trying to query network at first place. And then remove that part.
2 .059095="" 0.000076="" 0.000075="">/EDIT:
2 .059095="" 0.000076="" 0.000075="">It si not solved. The /etc/ppp/resolv.conf is created by my VPN. And I still do not know how to disable sudo sending some nasty messages over the network.
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