1. A computer implemented method comprising: identifying code regions in an application from which one or more offloadable tasks can be generated by a compiler for a heterogenous computing system including a processor and an accelerator memory, comprising: adding, by the processor, relaxed semantics to a directive based language in the heterogenous computing system for allowing a user to suggest rather than specify a parallel code region as an offloadable task candidate, wherein the offloadable task candidate is a sub-offload or a super-offload; and identifying, by the processor, one or more offloadable tasks in a neighborhood of code region marked by the directive based language.