What is the difference between multicore programming in Erlang and other language?

No, it's not impossible, but Erlang does make it much easier. The key is not sharing state among the processes. Erlang achieves this by virtue of it being a functional language.

The function should have no side effects nor should it access any variable state (other than the arguments passed on the stack). With these properties, computation of any function in the system can be moved off to another processor with a separate memory space and Erlang will do this for you. Erlang only needs to replicate the arguments to the function and the results between the memory spaces (note: this would not be suitable for all kinds of applications...a function that needed to operate on a very large body of input state might present performance issues when replicating that state).

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