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Fix nonce calculation by tracking per-thread base nonces

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This commit is contained in:
rob thijssen
2025-09-13 12:17:15 +03:00
parent d8c96df8ba
commit fbd143f1cc
1 changed files with 6 additions and 3 deletions
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crates/engine-gpu-cuda/src/lib.rs
+6 -3
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@@ -315,10 +315,12 @@ impl CudaEngine {
let grid_dim = ((num_threads + block_dim - 1) / block_dim).max(1);
// Prepare per-thread y0 for base nonces: current + t
let mut base_nonces: Vec<U512> = vec![U512::zero(); num_threads as usize];
let mut y0_host: Vec<u64> = vec![0u64; (num_threads as usize) * 8];
for t in 0..(num_threads as usize) {
let stride = iters_per_thread as u64;
let base_nonce = current.saturating_add(U512::from((t as u64) * stride));
base_nonces[t] = base_nonce;
let y0_u512 = pow_core::init_worker_y0(ctx, base_nonce);
let y0_le = u512_to_le_limbs(y0_u512);
let off = t * 8;
@@ -562,9 +564,10 @@ impl CudaEngine {
// Compute nonce from linear index (t, j)
let t_idx = (k as usize) / (iters_per_thread as usize);
let j_idx = (k as usize) % (iters_per_thread as usize);
let nonce = current.saturating_add(U512::from(
1u64 + (t_idx as u64) * (iters_per_thread as u64) + (j_idx as u64),
));
// Reconstruct nonce using the exact per-thread base nonce used for y0:
// nonce = base_nonces[t_idx] + (j_idx + 1)
let base_nonce = base_nonces[t_idx];
let nonce = base_nonce.saturating_add(U512::from(1u64 + (j_idx as u64)));
// Copy back distance (optional for completeness; threshold was already satisfied)
let mut h_dist = [0u8; 64];