Executing user-defined code in response to determining that resources expected to be utilized comply with resource restrictions

Systems and methods are described for determining a location in an on-demand code execution environment to execute user-specified code. The on-demand code execution environment may include many points of presence (POPs), some of which have limited computing resources. An execution profile for a set of user-specified code can be determined that indicates the resources likely to be used during execution of the code. Each POP of the environment may compare that execution profile to resource restrictions of the POP, to determine whether execution of the code should be permitted. In some instances, where execution of the code should not be permitted at a given POP, an alternative POP may be selected to execute the code.