I want to run a program on Intel Xeon Phi coprocessor. How can I know whether my machine has an Intel Xeon Phi coprocessor or not.
Well if it has one you should probably know as it is large (see pictures here), costly (several times the price of a desktop), and it generates a lot of heat (you need special fans) and drains a lot of electrical power (you need a special PSU).
otherwise lspci | grep Co-processor will tell you whether you have one or not.