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perf: tune snapshot bloom for higher tps #230

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perf: tune snapshot bloom for higher tps #230

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0cc0f51
tune snapshot bloom for 10k tps
bnoieh Oct 31, 2024
42e509b
tune bloom item limit
bnoieh Dec 1, 2024
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11 changes: 7 additions & 4 deletions core/state/snapshot/difflayer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@ var (
// Note, bumping this up might drastically increase the size of the bloom
// filters that's stored in every diff layer. Don't do that without fully
// understanding all the implications.
aggregatorMemoryLimit = uint64(4 * 1024 * 1024)
aggregatorMemoryLimit = uint64(4 * 1024 * 1024 * 3) // opBNB block gas limit is about 3 times to Ethereum

// aggregatorItemLimit is an approximate number of items that will end up
// in the aggregator layer before it's flushed out to disk. A plain account
Expand All @@ -50,23 +50,26 @@ var (
// smaller number to be on the safe side.
aggregatorItemLimit = aggregatorMemoryLimit / 42

// bloomItemLimit is an approximate number of all difflayer items (128 difflayers + 1 aggregatorlayer)
bloomItemLimit = 25*10000*5 + aggregatorItemLimit

// bloomTargetError is the target false positive rate when the aggregator
// layer is at its fullest. The actual value will probably move around up
// and down from this number, it's mostly a ballpark figure.
//
// Note, dropping this down might drastically increase the size of the bloom
// filters that's stored in every diff layer. Don't do that without fully
// understanding all the implications.
bloomTargetError = 0.02
bloomTargetError = 0.01

// bloomSize is the ideal bloom filter size given the maximum number of items
// it's expected to hold and the target false positive error rate.
bloomSize = math.Ceil(float64(aggregatorItemLimit) * math.Log(bloomTargetError) / math.Log(1/math.Pow(2, math.Log(2))))
bloomSize = math.Ceil(float64(bloomItemLimit) * math.Log(bloomTargetError) / math.Log(1/math.Pow(2, math.Log(2))))

// bloomFuncs is the ideal number of bits a single entry should set in the
// bloom filter to keep its size to a minimum (given it's size and maximum
// entry count).
bloomFuncs = math.Round((bloomSize / float64(aggregatorItemLimit)) * math.Log(2))
bloomFuncs = math.Round((bloomSize / float64(bloomItemLimit)) * math.Log(2))

// the bloom offsets are runtime constants which determines which part of the
// account/storage hash the hasher functions looks at, to determine the
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