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Just ran with `strace -T`, and got the following ``` write(1, "Start: 2020-12-19T10:36:32-0800\n", 32Start: 2020-12-19T10:36:32-0800 ) = 32 select(6, [5], NULL, NULL, {tv_sec=0, tv_usec=99999}) = 0 (Timeout) write(4, "33000 send-probe...

Built mtr with `-ggdb3 -O0` and backtraced in gdb: ``` #0 0x00007ffff7cd8b2a in select () from /usr/lib/libc.so.6 #1 0x000055555555d646 in select_loop (ctl=ctl@entry=0x7fffffffda80) at ui/select.c:181 #2 0x000055555555c125 in display_loop (ctl=ctl@entry=0x7fffffffda80) at...

Cause found: there is a default `ctl.GraceTime = 5.0` in `main.c:782`. Fix: run mtr with a shorter `--gracetime` But what's the purpose of waiting for a whole 5 second? The...