Only use one SlotMap#312
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* Change `SlotMap` for `children` and `parents` to `SecondaryMap`
alice-i-cecile
added
code quality
Collaborator
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Neat. Reading the docs for SecondaryMap suggests that this is primarily a performance optimization. I think this makes sense, but have you tested out the benchmarks before and after? |
Member
I think this is the only benefit. And I think how it works is like this:
I guess that might give a slight performance boost, as it would save the SecondarySlotMap from looking for a free slot on insert. It also means we don't have to manually remove keys from the secondary maps (only the primary one). Seems like a win, but a small one? Although measuring would of course be a good idea. |
Author
I don’t really have much experience with benchmarking 😅 is there a easy command for that? |
Member
There is: ‘cargo bench’. You should run it first on the main branch. Then checkout your branch and run it again (and ideally post the output of the second run here). |
Author
Ok thanks I’ll do it later |
Author
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(i ran the new changes first, so don't be confused with the Main branch: DasLixou's PR: Looks like my changes actually decrease performace: i run my change again after the benchmarks of the |
Member
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Hmm... basically looks like performance isn't affected much at all. That benchmark is only using 10 nodes and completes in microseconds so there tends to be a bit of variance on it. This is actually what I would expect. Especially as our benchmarks currently only test layout computation, and don't benchmark tree creation at all. Whereas tree creation is the only thing I would expect this to affect (if anything). |
Collaborator
Precisely. We should probably have dedicated benches for that. |
Collaborator
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Going to block on #322 here, or other compelling evidence that this helps :) I think this is right, but perf changes are notoriously hard to do by gut feel. |
Member
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Cherry picking this on top of #401 confirms that this PR doesn't make much difference to perf even if we measure tree creation. So a decision on this should be made purely on the basis of code style. |
Collaborator
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I think this is somewhat more complex; closing. |
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Objective
Change
SlotMapforchildrenandparentstoSecondaryMapChanges that will affect external library users must update RELEASES.md before they will be merged.
Context
Maybe remove lines like
204,205innode.rs, maybe they are useless now.