Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

> How many semi-spaces do you think of having in this generation? Most systems 
> have and recommend two.

I suppose we would need to experiment, but for what I have seen I think two or 
three :) What do you think?

> If it is a worse tradeoff to managing steps then I would suggest to stick to 
> the steps.

I think any memory increase that scales with the number of objects will be a 
big concern.

>  we need to add a step and manage it which is more complex than for example 
> when tracking ages, incase of a change we only change the age threshold which 
> looks simpler to implement.

Exactly, but if with "tracking ages" you mean store per-object ages then the 
previous concern applies :( Adding sub-generation steps should not be much more 
complicated IMHO.

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<https://bugs.python.org/issue39143>
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