I am about to develop a piece of software and I want to ascertain the impact it has on my system. The main things I am look for are load times, memory and CPU usage and shutdown time, although I would like to get as much information as possible. I know I can use my distro's system monitor to get some of this stuff, but I need precise data as I am going to be doing some before and after tests during my project. Is there anything out there (preferably open source) that will suffice?