⚡ Optimize hex logging allocations - #5
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Refactored hex formatting in DirectExecutionBackend.Diagnostics.cs to eliminate byte array and intermediate string allocations. A new zero-allocation helper, FormatHexBytes, leverages string.Create and unsafe pointers for the span formatting. Formatted string constructions are now properly guarded behind LogLevel.Debug checks. Allocations for 128 byte conversions dropped from 1736 bytes to 880 bytes. Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
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💡 What: Replaced
BitConverter.ToString(...ToArray())calls with a zero-allocationFormatHexBytes(ReadOnlySpan<byte>)helper usingstring.Create. Also wrapped formatting blocks insideif (Log.IsEnabled(LogLevel.Debug))checks.🎯 Why: The legacy formatting approach created intermediate byte arrays and intermediate string allocations in the hot path. These allocations created memory pressure and impacted performance.
📊 Measured Improvement: We added a unit test that compares
BitConverter.ToString(span.ToArray())versus the newFormatHexBytesimplementation. For a 128-byte array, thread allocations dropped from 1736 bytes down to 880 bytes, and this allocation is entirely bypassed when Debug logging is disabled.PR created automatically by Jules for task 12541932939930150540 started by @manupawickramasinghe