Demo: The Address Space, Line by Line¶

A program that waits so that pmap can look at it, built statically and dynamically.

Run¶

Two terminals. First:

make
./see-pmap-static

Second, at each prompt:

pmap -x $(pidof see-pmap-static)

Then the same with ./see-pmap.

Twelve lines. Which came from the file, which are the heap and the stack, and which did nobody ask for?
After allocating, only three lines changed. Which three, and in what direction?
The dynamic build has twice the lines and a fifth of the Dirty kilobytes. What is libc's code area sharing, and with whom?