My answer would be that Chapel supports a partitioned global namespace such that a variable within the lexical scope of a given statement can be referenced whether it is local to that CPU's memory, stored on a remote compute node, or stored within a GPU's memory (say). The compiler and runtime implement the communication on the programmer's behalf and take steps to optimize away unnecessary communication. Other key features include first-class support for creating parallel tasks in high-level ways, including parallel loops.
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