1. A method for running a plurality of instances of an application, comprising: starting to run a root instance of the application, the root instance comprising at least one thread; in response to determining that a thread of the root instance runs to a preset freezing point in the application, stopping running all threads of the root instance; in response to starting to run an additional instance of the application, replicating a running state of all threads of the root instance as a running state of all threads of the additional instance of the application; and continuing to run all threads of the additional instance of the application.