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Parallel proof-of-work search (#92)

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Daniel Lubarov 2021-07-15 07:40:41 -07:00 committed by GitHub
parent 77ce69dc15
commit 573badc96f
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3 changed files with 14 additions and 7 deletions
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2
Cargo.toml
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@ -18,7 +18,7 @@ itertools = "0.10.0"
num = "0.3"
rand = "0.7.3"
rand_chacha = "0.2.2"
rayon = "1.5.0"
rayon = "1.5.1"
unroll = "0.1.5"
anyhow = "1.0.40"
serde = { version = "1.0", features = ["derive"] }

4
src/bin/bench_recursion.rs
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@ -26,9 +26,9 @@ fn bench_prove<F: Field + Extendable<D>, const D: usize>() {
rate_bits: 3,
num_challenges: 3,
fri_config: FriConfig {
proof_of_work_bits: 10,
proof_of_work_bits: 20,
rate_bits: 3,
reduction_arity_bits: vec![2, 2, 2, 2, 2],
reduction_arity_bits: vec![2, 2, 2, 2, 2, 2],
num_query_rounds: 35,
},
};

15
src/fri/prover.rs
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@ -1,3 +1,5 @@
use rayon::prelude::*;
use crate::field::extension_field::{flatten, unflatten, Extendable};
use crate::field::field::Field;
use crate::fri::FriConfig;
@ -7,6 +9,7 @@ use crate::plonk_challenger::Challenger;
use crate::plonk_common::reduce_with_powers;
use crate::polynomial::polynomial::{PolynomialCoeffs, PolynomialValues};
use crate::proof::{FriInitialTreeProof, FriProof, FriQueryRound, FriQueryStep, Hash};
use crate::timed;
use crate::util::reverse_index_bits_in_place;
/// Builds a FRI proof.
@ -32,7 +35,10 @@ pub fn fri_proof<F: Field + Extendable<D>, const D: usize>(
// PoW phase
let current_hash = challenger.get_hash();
let pow_witness = fri_proof_of_work(current_hash, config);
let pow_witness = timed!(
fri_proof_of_work(current_hash, config),
"to find for proof-of-work witness"
);
// Query phase
let query_round_proofs =
@ -94,8 +100,9 @@ fn fri_committed_trees<F: Field + Extendable<D>, const D: usize>(
}
fn fri_proof_of_work<F: Field>(current_hash: Hash<F>, config: &FriConfig) -> F {
(0u64..)
.find(|&i| {
(0..u64::MAX)
.into_par_iter()
.find_any(|&i| {
hash_n_to_1(
current_hash
.elements
@ -110,7 +117,7 @@ fn fri_proof_of_work<F: Field>(current_hash: Hash<F>, config: &FriConfig) -> F {
>= config.proof_of_work_bits + F::ORDER.leading_zeros()
})
.map(F::from_canonical_u64)
.expect("Proof of work failed.")
.expect("Proof of work failed. This is highly unlikely!")
}
fn fri_prover_query_rounds<F: Field + Extendable<D>, const D: usize>(