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pow: use shared fishhash context pointer and reduce memory usage #68

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Merged
Leon1777 merged 3 commits into from
Feb 12, 2026
Merged

pow: use shared fishhash context pointer and reduce memory usage #68

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7d63bc3
pow: use shared fishhash context pointer
Leon1777 Feb 8, 2026
928e884
pow: generate mat for KHashV1 only
Leon1777 Feb 9, 2026
7f34420
avoid allocating full khashv2 dataset
Leon1777 Feb 11, 2026
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23 changes: 16 additions & 7 deletions domain/consensus/utils/pow/pow.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,13 +18,13 @@ const hashingAlgoVersion = "fishhash-kls-0.0.2"

// State is an intermediate data structure with pre-computed values to speed up mining.
type State struct {
mat matrix
mat *matrix // can be nil
Timestamp int64
Nonce uint64
Target big.Int
prePowHash externalapi.DomainHash
//cache cache
context fishhashContext
context *fishhashContext
blockVersion uint16
}

Expand Down Expand Up @@ -53,7 +53,10 @@ func getContext(full bool, log *logger.Logger) *fishhashContext {
log.Debugf("getContext object 42 : %x", lightCache[42])
log.Debugf("getContext object 100 : %x", lightCache[100])

fullDataset := make([]hash1024, fullDatasetNumItems)
var fullDataset []hash1024
if full {
fullDataset = make([]hash1024, fullDatasetNumItems)
}

sharedContext = &fishhashContext{
ready: false,
Expand Down Expand Up @@ -95,14 +98,20 @@ func NewState(header externalapi.MutableBlockHeader, generatedag bool) *State {

log.Debugf("BlueWork[%s] BlueScore[%d] DAAScore[%d] Version[%d]", header.BlueWork(), header.BlueScore(), header.DAAScore(), header.Version())

var mat *matrix
// only generate matrix if using khashv1
if header.Version() == constants.BlockVersionKHashV1 {
mat = generateMatrix(prePowHash)
}

return &State{
Target: *target,
prePowHash: *prePowHash,
//will remove matrix opow
mat: *generateMatrix(prePowHash),
mat: mat, // nil for v2
Timestamp: timestamp,
Nonce: nonce,
context: *getContext(generatedag, log),
context: getContext(generatedag, log),
blockVersion: header.Version(),
}
}
Expand All @@ -114,7 +123,7 @@ func GetHashingAlgoVersion() string {

// IsContextReady checks the readiness of the context
func (state *State) IsContextReady() bool {
if state != nil {
if state != nil && state.context != nil {
return state.context.ready
}
return false
Expand Down Expand Up @@ -149,7 +158,7 @@ func (state *State) CalculateProofOfWorkValue() *big.Int {
finalHash = state.mat.HeavyHash(powHash)
} else {
log.Debugf("Using khashv2 %d %d", state.blockVersion, constants.BlockVersionKHashV2)
middleHash := fishHashPlus(&state.context, powHash)
middleHash := fishHashPlus(state.context, powHash)
writer2 := hashes.NewPoWHashWriter()
writer2.InfallibleWrite(middleHash.ByteSlice())
finalHash = writer2.Finalize()
Expand Down
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