Parallel execution of computationally expensive map

I am new to the ReactiveX library (I use its scala variant, RxScala).

I have an Observable that emits values at high rate. I would like to apply a function to all values of the Observable (map). The function, which I use in map, is computationally rather expensive.

Is there a way to have a thread pool for computing the map phase in parallel?

Copyright Notice：Content Author:「David Frank」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/33816501/parallel-execution-of-computationally-expensive-map

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