Mastering Go - Second Edition

The dtrace tool

Although debugging utilities such as strace(1) and truss(1) can trace system calls produced by a process, they can be slow and therefore not appropriate for solving performance problems on busy UNIX systems. Another tool, named DTrace, allows you to see what happens behind the scenes on a system-wide basis without the need to modify or recompile anything. It also allows you to work on production systems and watch running programs or server processes dynamically without introducing a big overhead.

Although there is a version of dtrace(1) that works on Linux, the dtrace(1) tool works best on macOS and the other FreeBSD variants.

This subsection will use the dtruss(1) command-line utility that comes with macOS, which is just ...