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Avoid redundant compaction buffer clearing on GPU

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Marek Lemańczyk committed 2025-10-23 01:16:58 +02:00
1 parent dda53581c0
commit f672ff520c
3 files changed
+7 -6
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PerfectNumbers.Core/Gpu/Kernels/DivisorByDivisorKernels.cs
+4 -2
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@@ -232,8 +232,10 @@ internal static class DivisorByDivisorKernels
int lastLaneMask = globalIndex == length - 1 ? 1 : 0; int lastLaneMask = globalIndex == length - 1 ? 1 : 0;
int countValue = shared[prefixBase + localIndex]; int countValue = shared[prefixBase + localIndex];
int storedCount = lastLaneMask != 0 ? countValue : 0; if (lastLaneMask != 0)
Atomic.Max(ref compactedCount[0], storedCount); {
compactedCount[0] = countValue;
}
} }
public static void PublishFirstHitKernel( public static void PublishFirstHitKernel(
PerfectNumbers.Core/Gpu/MersenneNumberDivisorByDivisorGpuTester.cs
-1
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@@ -600,7 +600,6 @@ public sealed class MersenneNumberDivisorByDivisorGpuTester : IMersenneNumberDiv
// return 0; // return 0;
// } // }
countView.MemSetToZero();
SharedMemoryConfig sharedMemoryConfig = SharedMemoryConfig.RequestDynamic<int>(count * 3); SharedMemoryConfig sharedMemoryConfig = SharedMemoryConfig.RequestDynamic<int>(count * 3);
Index1D gridDim = new Index1D(1); Index1D gridDim = new Index1D(1);
Index1D groupDim = new Index1D(count); Index1D groupDim = new Index1D(count);
PerfectNumbers.Core/MersenneNumberDivisorByDivisorTester.cs
+3 -3
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@@ -73,7 +73,7 @@ public static class MersenneNumberDivisorByDivisorTester
candidateCount = candidateSpan.Length; candidateCount = candidateSpan.Length;
} }
pool.Return(recordedCandidates, clearArray: true); pool.Return(recordedCandidates, clearArray: false);
} }
if (skippedByPreviousResults > 0) if (skippedByPreviousResults > 0)
@@ -211,8 +211,8 @@ public static class MersenneNumberDivisorByDivisorTester
filteredPrimes.Add(prime); filteredPrimes.Add(prime);
} }
pool.Return(allowedMaxBatch, clearArray: true); pool.Return(allowedMaxBatch, clearArray: false);
pool.Return(primeBatch, clearArray: true); pool.Return(primeBatch, clearArray: false);
// The filtered list mirrors primesToTest in the CPU flow, so the guard below never triggers after the earlier // The filtered list mirrors primesToTest in the CPU flow, so the guard below never triggers after the earlier
// emptiness checks. // emptiness checks.