Question about `batch_fitness` and `SIMD` about pagmo2 HOT 3 OPEN

@adriendelsalle Thanks for the kind words!

Indeed you are correct, the data layout was thought with thread/process-based BFEs in mind.

I suppose that, as the adoption of AVX512 increases, the availability of gather/scatter instructions would at least alleviate the issue.

As an alternative, we could think about extending the BFE API to give the user the ability to signal how the data is stored (i.e., row-major vs column-major). Of course we would need to ensure that such extension does not break existing uses of the BFE API, which could be tricky.

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I love the idea of trying to signal/flag the layout.

I'll have to take a deeper look at the project to see how I could make some relevant PR on that, it will probably take few week before I can find time to really investigate further.. but if you're fine with contributions I can give it a try !

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@adriendelsalle of course it would be great if you wanted to take a stab at this.

Feel free to ping me if you need assistance (here or on the gitter channel https://gitter.im/pagmo2/Lobby )

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