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mimblewimble / grin

Minimal implementation of the Mimblewimble protocol.
https://grin.mw/
Apache License 2.0
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Spdupverifypow #3672

Closed tromp closed 2 years ago

tromp commented 2 years ago

name: Spdupverifypow about: Speed up all 5 PoW verification functions about 5x title: Speed up PoW verify labels: assignees:

Profiling an initial header sync found about 20% of time was spent in cuckaroo::verify The old code for all 5 verify functions was quadratic in cycle length, taking on average 42/2 iterations of an inner loop to find the next edge in the cycle. The new code uses 2 or 3 extra arrays of length O(proof_size) that allows the next edge in the cycle to be found in O(1) iterations on average.

Tested with a full sync from scratch on mainnet.

yeastplume commented 2 years ago

Had a look over and run it; new avionics look good!