Javascript does not support threading at all. The language is not thread 
safe in many places. The best attempt at multi-threading is via workers. 
Each worker has it's own separate heap and are synchronized via messages.

That being said, spawning a worker or a new isolate just to do SIMD is 
prohibitively expensive. Besides, recognizing a loop that is suitable for 
SIMD operations is very hard in Javascript, since close to anything can 
have side effects. There is a language proposal to address 
this: 
https://docs.google.com/presentation/d/1MY9NHrHmL7ma7C8dyNXvmYNNGgVmmxXk8ZIiQtPlfH4/edit

Yang

On Tuesday, February 23, 2016 at 8:34:38 AM UTC+1, Tiny Wings wrote:
>
> About my question:
> This is actually not really much about parallelization; this is rather 
> about how to do launch multiple threads in multiple cores within a 
> javascript program and make them communicate when needed.
>

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