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rayon parallel PoW grinding for CpuBackend #826

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rayon parallel PoW grinding for CpuBackend #826

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65a67a0
cpu backend parallel grinding support
Okm165 Sep 8, 2024
2ca6362
change grinding error message
Okm165 Sep 8, 2024
e697e84
Merge branch 'dev' into parallel_grinding
Okm165 Sep 9, 2024
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31 changes: 24 additions & 7 deletions crates/prover/src/core/backend/cpu/grind.rs
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Original file line number Diff line number Diff line change
@@ -1,18 +1,35 @@
#[cfg(feature = "parallel")]
use rayon::prelude::*;

use super::CpuBackend;
use crate::core::channel::Channel;
use crate::core::proof_of_work::GrindOps;

impl<C: Channel> GrindOps<C> for CpuBackend {
impl<C> GrindOps<C> for CpuBackend
where
C: Channel + std::marker::Sync,
{
fn grind(channel: &C, pow_bits: u32) -> u64 {
// TODO(spapini): This is a naive implementation. Optimize it.
let mut nonce = 0;
loop {

let check_nonce = |nonce: &u64| {
let mut channel = channel.clone();
channel.mix_u64(nonce);
if channel.trailing_zeros() >= pow_bits {
return nonce;
channel.mix_u64(*nonce);
channel.trailing_zeros() >= pow_bits
};

{
let range = 0..u64::MAX;
#[cfg(not(feature = "parallel"))]
{
range.into_iter().find(check_nonce)
}

#[cfg(feature = "parallel")]
{
range.into_par_iter().find_any(check_nonce)
}
nonce += 1;
}
.expect("Grind failed to find a solution.")
}
}