1. A method for generating an executable file of a multi-instance service, comprising: performing compilation for a source file corresponding to a multi-instance service at a time, to obtain a first-class object file, wherein the multi-instance service comprises N instances, and N is a natural number greater than or equal to 2; performing an object copy of the first-class object file N−1 times, to obtain N−1 new first-class object files; and performing linking to the first-class object file and the N−1 new first-class object files, to generate an executable file.