Technologies are generally described for a system, method and data center effective to execute a code. In an example, a method may include receiving, by a first processor, a first code from a second processor. The method may further include compiling the first code for first and second hardware stacks to produce first and second executable codes. The second hardware stack may be different from the first hardware stack. The method may include generating a reference to the first executable code and the second executable code and storing the reference. The method may further include receiving, by a third processor, an instance and a request to execute the instance. The method may further include executing the first executable code by the first hardware stack.