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cap maximum number of messages per block in selection #4905

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Nov 18, 2020
Merged

cap maximum number of messages per block in selection #4905

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18 changes: 15 additions & 3 deletions chain/messagepool/selection.go
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@ import (

var bigBlockGasLimit = big.NewInt(build.BlockGasLimit)

var MaxBlockMessages = 16000

// this is *temporary* mutilation until we have implemented uncapped miner penalties -- it will go
// away in the next fork.
func allowNegativeChains(epoch abi.ChainEpoch) bool {
Expand All @@ -43,7 +45,7 @@ type msgChain struct {
prev *msgChain
}

func (mp *MessagePool) SelectMessages(ts *types.TipSet, tq float64) ([]*types.SignedMessage, error) {
func (mp *MessagePool) SelectMessages(ts *types.TipSet, tq float64) (msgs []*types.SignedMessage, err error) {
mp.curTsLk.Lock()
defer mp.curTsLk.Unlock()

Expand All @@ -54,10 +56,20 @@ func (mp *MessagePool) SelectMessages(ts *types.TipSet, tq float64) ([]*types.Si
// than any other block, then we don't bother with optimal selection because the
// first block will always have higher effective performance
if tq > 0.84 {
return mp.selectMessagesGreedy(mp.curTs, ts)
msgs, err = mp.selectMessagesGreedy(mp.curTs, ts)
} else {
msgs, err = mp.selectMessagesOptimal(mp.curTs, ts, tq)
}

if err != nil {
return nil, err
}

if len(msgs) > MaxBlockMessages {
msgs = msgs[:MaxBlockMessages]
}

return mp.selectMessagesOptimal(mp.curTs, ts, tq)
return msgs, nil
}

func (mp *MessagePool) selectMessagesOptimal(curTs, ts *types.TipSet, tq float64) ([]*types.SignedMessage, error) {
Expand Down