Display information about memory use of an application for the program data
I use this tool to optimize applications. Changing code a bit might mean one less page of data. It also helps to see whether data is moved from pure data segments to relro segments which are more secure. Example output:
$ nrpages ~/bin/nrpages
/home/drepper/bin/nrpages: 1 read-only, 2 writable, 2 COW, 1 relro