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Optimize memory allocation in ALMA and Conv classes; improve performance by using stackalloc for small periods

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Miha Kralj
2025-12-10 15:15:20 -05:00
parent 47884bddab
commit 81830c9031
3 changed files with 8 additions and 15 deletions
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lib/trends/alma/Alma.cs
+2 -2
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@@ -210,7 +210,8 @@ public sealed class Alma : ITValuePublisher
throw new ArgumentException("Source and output must have the same length");
// Precompute weights
double[] weights = new double[period];
// Use stackalloc for small periods to avoid heap allocation
Span<double> weights = period <= 256 ? stackalloc double[period] : new double[period];
double m = offset * (period - 1);
double s = period / sigma;
double s2 = 2 * s * s;
@@ -224,7 +225,6 @@ public sealed class Alma : ITValuePublisher
}
// Buffer for sliding window
// Use stackalloc for small periods
Span<double> buffer = period <= 256 ? stackalloc double[period] : new double[period];
int bufferIdx = 0;
int count = 0;