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simplify FC weight computation (#4892) 

Optimizations from https://github.com/ethereum/consensus-specs/pull/3246
avoid a couple unnecessary divisions when calculating proposer boost.
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Etan Kissling 2023-05-09 12:16:13 +02:00 committed by GitHub
parent 5b3c211285
commit 5c5fbc088f
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1 changed files with 4 additions and 16 deletions
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20
beacon_chain/fork_choice/proto_array.nim
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@ -123,24 +123,12 @@ iterator realizePendingCheckpoints*(
# Reset tip tracking for new epoch
self.currentEpochTips.clear()
# https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/fork-choice.md#get_latest_attesting_balance
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/fork-choice.md#get_weight
func calculateProposerBoost(validatorBalances: openArray[Gwei]): uint64 =
var
total_balance: uint64
num_validators: uint64
var total_balance: uint64
for balance in validatorBalances:
# We need to filter zero balances here to get an accurate active validator
# count. This is because we default inactive validator balances to zero
# when creating this balances array.
if balance != 0:
total_balance += balance
num_validators += 1
if num_validators == 0:
return 0
let
average_balance = total_balance div num_validators.uint64
committee_size = num_validators div SLOTS_PER_EPOCH
committee_weight = committee_size * average_balance
total_balance += balance
let committee_weight = total_balance div SLOTS_PER_EPOCH
(committee_weight * PROPOSER_SCORE_BOOST) div 100
func applyScoreChanges*(self: var ProtoArray,