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Tree hash caching and optimisations for Altair (#2459)

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## Proposed Changes

Remove the remaining Altair `FIXME`s from consensus land.

1. Implement tree hash caching for the participation lists. This required some light type manipulation, including removing the `TreeHash` bound from `CachedTreeHash` which was purely descriptive.
2. Plumb the proposer index through Altair attestation processing, to avoid calculating it for _every_ attestation (potentially 128ms on large networks). This duplicates some work from #2431, but with the aim of getting it in sooner, particularly for the Altair devnets.
3. Removes two FIXMEs related to `superstruct` and cloning, which are unlikely to be particularly detrimental and will be tracked here instead: https://github.com/sigp/superstruct/issues/5
This commit is contained in:
Michael Sproul
2021-07-23 00:23:53 +00:00
parent 74aa99c409
commit 84e6d71950
11 changed files with 206 additions and 39 deletions
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beacon_node/beacon_chain/src/beacon_fork_choice_store.rs
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@@ -321,7 +321,6 @@ where
.deconstruct()
.0;
// FIXME(altair): could remove clone with by-value `balances` accessor
self.justified_balances = self
.store
.get_state(&justified_block.state_root(), Some(justified_block.slot()))