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Run per-slot fork choice at a further distance from the head (#3487)

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## Issue Addressed

NA

## Proposed Changes

Run fork choice when the head is 256 slots from the wall-clock slot, rather than 4.

The reason we don't *always* run FC is so that it doesn't slow us down during sync. As the comments state, setting the value to 256 means that we'd only have one interrupting fork-choice call if we were syncing at 20 slots/sec.

## Additional Info

NA
This commit is contained in:
Paul Hauner 2022-08-19 04:27:24 +00:00
parent df358b864d
commit 931153885c
2 changed files with 10 additions and 2 deletions
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6
beacon_node/beacon_chain/src/beacon_chain.rs
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@ -131,7 +131,11 @@ const PREPARE_PROPOSER_HISTORIC_EPOCHS: u64 = 4;
/// run the per-slot tasks (primarily fork choice). /// run the per-slot tasks (primarily fork choice).
/// ///
/// This prevents unnecessary work during sync. /// This prevents unnecessary work during sync.
const MAX_PER_SLOT_FORK_CHOICE_DISTANCE: u64 = 4; ///
/// The value is set to 256 since this would be just over one slot (12.8s) when syncing at
/// 20 slots/second. Having a single fork-choice run interrupt syncing would have very little
/// impact whilst having 8 epochs without a block is a comfortable grace period.
const MAX_PER_SLOT_FORK_CHOICE_DISTANCE: u64 = 256;
/// Reported to the user when the justified block has an invalid execution payload. /// Reported to the user when the justified block has an invalid execution payload.
pub const INVALID_JUSTIFIED_PAYLOAD_SHUTDOWN_REASON: &str = pub const INVALID_JUSTIFIED_PAYLOAD_SHUTDOWN_REASON: &str =

6
beacon_node/beacon_chain/src/state_advance_timer.rs
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@ -38,7 +38,11 @@ use types::{AttestationShufflingId, EthSpec, Hash256, RelativeEpoch, Slot};
const MAX_ADVANCE_DISTANCE: u64 = 4; const MAX_ADVANCE_DISTANCE: u64 = 4;
/// Similarly for fork choice: avoid the fork choice lookahead during sync. /// Similarly for fork choice: avoid the fork choice lookahead during sync.
const MAX_FORK_CHOICE_DISTANCE: u64 = 4; ///
/// The value is set to 256 since this would be just over one slot (12.8s) when syncing at
/// 20 slots/second. Having a single fork-choice run interrupt syncing would have very little
/// impact whilst having 8 epochs without a block is a comfortable grace period.
const MAX_FORK_CHOICE_DISTANCE: u64 = 256;
#[derive(Debug)] #[derive(Debug)]
enum Error { enum Error {