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refactor: better select challenges function #1731

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Dec 1, 2023
Merged

refactor: better select challenges function #1731

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19 changes: 10 additions & 9 deletions filecoin-proofs/src/parameters.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -104,20 +104,21 @@ pub fn setup_params(porep_config: &PoRepConfig) -> Result<stacked::SetupParams>
})
}

/// Division of x by y, rounding up.
/// x and y must be > 0
const fn div_ceil(x: usize, y: usize) -> usize {
1 + ((x - 1) / y)
}

fn select_challenges(
partitions: usize,
minimum_total_challenges: usize,
use_synthetic: bool,
) -> LayerChallenges {
let mut count = 1;
let mut guess = LayerChallenges::new(count);
while partitions * guess.challenges_count_all() < minimum_total_challenges {
count += 1;
guess = LayerChallenges::new(count);
}

guess.use_synthetic = use_synthetic;
guess
let challenges = div_ceil(minimum_total_challenges, partitions);
let mut result = LayerChallenges::new(challenges);
result.use_synthetic = use_synthetic;
result
}

#[cfg(test)]
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