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Optimization: avoid recomputing known state roots (#762)

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* Start adding optimization

* Add temp fix for protobuf issue

* Fix compile errors

* Fix protobuf import
This commit is contained in:
Paul Hauner
2020-01-03 15:09:00 +11:00
committed by GitHub
parent 39df89521f
commit 647034b637
11 changed files with 42 additions and 16 deletions
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20
beacon_node/beacon_chain/src/beacon_chain.rs
View File

@@ -515,7 +515,9 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
});
}
match per_slot_processing(&mut state, &self.spec) {
// Note: supplying some `state_root` when it is known would be a cheap and easy
// optimization.
match per_slot_processing(&mut state, None, &self.spec) {
Ok(()) => (),
Err(e) => {
warn!(
@@ -887,7 +889,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
.start_slot(T::EthSpec::slots_per_epoch())
.as_u64()
{
per_slot_processing(&mut state, &self.spec)?;
per_slot_processing(&mut state, None, &self.spec)?;
}
state.build_committee_cache(RelativeEpoch::Current, &self.spec)?;
@@ -1258,7 +1260,14 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
if i > 0 {
intermediate_states.push(state.clone());
}
per_slot_processing(&mut state, &self.spec)?;
let state_root = if i == 0 {
Some(parent_block.state_root)
} else {
None
};
per_slot_processing(&mut state, state_root, &self.spec)?;
}
metrics::stop_timer(catchup_timer);
@@ -1426,8 +1435,11 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
.ok_or_else(|| BlockProductionError::NoEth1ChainConnection)?;
// If required, transition the new state to the present slot.
//
// Note: supplying some `state_root` when it it is known would be a cheap and easy
// optimization.
while state.slot < produce_at_slot {
per_slot_processing(&mut state, &self.spec)?;
per_slot_processing(&mut state, None, &self.spec)?;
}
state.build_committee_cache(RelativeEpoch::Current, &self.spec)?;

2
beacon_node/beacon_chain/src/fork_choice.rs
View File

@@ -155,7 +155,7 @@ impl<T: BeaconChainTypes> ForkChoice<T> {
// Fast-forward the state to the start slot of the epoch where it was justified.
for _ in block.slot.as_u64()..block_justified_slot.as_u64() {
per_slot_processing(&mut state, &chain.spec)
per_slot_processing(&mut state, None, &chain.spec)
.map_err(BeaconChainError::SlotProcessingError)?
}

2
beacon_node/beacon_chain/src/test_utils.rs
View File

@@ -287,7 +287,7 @@ where
}
while state.slot < slot {
per_slot_processing(&mut state, &self.spec)
per_slot_processing(&mut state, None, &self.spec)
.expect("should be able to advance state to slot");
}