> (understanding how the I/O and networking system calls work is quite helpful for application developers, even if you work in node.js, python or another high l

> (understanding how the I/O and networking system calls work is quite helpful for application developers, even if you work in node.js, python or another high level language) Being able to semi-quickly figure out how the kernel actually performs some I/O operations and what the exact semantics are is tremendously useful when working with low-level I/O applications (e.g. database-like applications).