Methods to facilitate monitoring the execution of a first instance and a second instance, such as multiple instantiations of a program, are generally described. The methods may include generating a first instance and a second instance, appending first monitoring instructions to the first instance to produce a first modified instance and appending second monitoring instructions to the second instance to produce a second modified instance. The first and second monitoring instructions may relate to monitoring an execution of the first instance and the second instance. The processor may further send the first modified instance to a first computing device and send the second modified instance to a second computing device different from the first computing device. The computing devices may provide different computational functionality and/or may split a load in processing the program.