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Reduce allocations in TraceContext #7851

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@andrewlock andrewlock commented Nov 21, 2025 •
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Summary of changes

Replace ArraySegment<Span> with SpanCollection

Reason for change

ArraySegment<Span> is a wrapper around an array, and by design, always requires allocating an array.

However, if we look at the distribution of traces received for processing, we see that 50% of traces only have a single span.

Consequently, SpanCollection takes a similar approach to StringValues, in which it is an abstraction around either a single Span or a Span[]. This means we can avoid allocating the array entirely until we need to.

For small traces (with a single span), this saves 56 Bytes per scope/trace or ~8% of the basic trace size. For larger traces, SpanCollection and ArraySegment<Span> are essentially identical, so the allocation is the same.

Given SpanCollection (and ArraySegment actually) are readonly struct, also added in to the signatures (given that both structs are the same size and > pointer size).

The only practical way I could see to actually make SpanCollection pointer-sized is to remove the Count parameter. But that means we either need to allocate an "ArraySegment" wrapper around the Array, to hold the count, or we always allocate an array of the "correct" length. I explored the latter in a separate PR, using an array pool during the "builder" step, and then allocating an array of the correct size subsequently, but the allocation gains were marginal, and it didn't

Implementation details

The changes are essentially:

  • SpanCollection holds either a Span or a Span[] (or null)
  • We store this in the same field (much like StringValues does), as it reduces the size of the struct which brings small perf benefits
  • Pass the span around via in to reduce chance of defensive copies
  • Fix/replace uses of Moq which requires different usage for in/ref fields, and can't provide the same functionality as a stub

Test coverage

Added some unit tests for the implementation, but the important thing is the benchmarks. We see an 8-8.5% reduction in the allocations for create span/create scope:

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.SpanBenchmark.StartFinishScope‑net6.0 696 B 640 B -56 B -8.05%
Benchmarks.Trace.SpanBenchmark.StartFinishScope‑netcoreapp3.1 696 B 640 B -56 B -8.05%
Benchmarks.Trace.SpanBenchmark.StartFinishScope‑net472 658 B 602 B -56 B -8.51%
Benchmarks.Trace.SpanBenchmark.StartFinishSpan‑net472 578 B 522 B -56 B -9.69%
Benchmarks.Trace.SpanBenchmark.StartFinishSpan‑net6.0 576 B 520 B -56 B -9.72%
Benchmarks.Trace.SpanBenchmark.StartFinishSpan‑netcoreapp3.1 576 B 520 B -56 B -9.72%

Other benchmarks which create a single span see similar improvements.

Note that the two scope benchmark (added in #7869) shows essentially no change (as expected).

Other details

I tried a variety of variations on this approach:

  • Keep separate fields for Span and Span[]
    • Nicer as it's type safe again, but increases allocations (by a pointer) so prob not worth it as this is hot path
  • Don't pass via in
    • Slows things down slightly
  • Remove the Count field (and make SpanCollection pointer-sized)
    • Requires allocating exact-sized arrays, so not practical to handle array growth
  • Same as above, but use an array pool for the build stage, and then only allocate the fixed size on close
    • Does show improvements in allocation, but more complexity. May be worth considering (I'll create a separate PR for it)
  • Don't have a builder, just use an array pool + a Count field, and rely on reliably cleaning up the pooling,

@andrewlock andrewlock added area:tracer The core tracer library (Datadog.Trace, does not include OpenTracing, native code, or integrations) type:performance Performance, speed, latency, resource usage (CPU, memory) area:benchmarks Benchmarks, throughput tests, Crank, Bombardier, etc labels Nov 21, 2025
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Benchmarks

Benchmarks Report for benchmark platform 🐌

Benchmarks for #7851 compared to master:

  • 1 benchmarks are faster, with geometric mean 1.659
  • 1 benchmarks are slower, with geometric mean 1.211
  • 37 benchmarks have fewer allocations
  • 6 benchmarks have more allocations

The following thresholds were used for comparing the benchmark speeds:

  • Mann–Whitney U test with statistical test for significance of 5%
  • Only results indicating a difference greater than 10% and 0.3 ns are considered.

Allocation changes below 0.5% are ignored.

Benchmark details

Benchmarks.Trace.ActivityBenchmark - Same speed ✔️ More allocations ⚠️

More allocations ⚠️ in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.ActivityBenchmark.StartStopWithChild‑net472 6.01 KB 6.06 KB 51 B 0.85%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master StartStopWithChild net6.0 9.99μs 54.5ns 332ns 0 0 0 5.5 KB
master StartStopWithChild netcoreapp3.1 13.6μs 70.4ns 330ns 0 0 0 5.71 KB
master StartStopWithChild net472 21.8μs 120ns 741ns 0.978 0.435 0.109 6.01 KB
#7851 StartStopWithChild net6.0 9.91μs 9.4ns 36.4ns 0 0 0 5.51 KB
#7851 StartStopWithChild netcoreapp3.1 13.8μs 66.1ns 273ns 0 0 0 5.72 KB
#7851 StartStopWithChild net472 22.3μs 99.5ns 385ns 0.994 0.331 0.11 6.06 KB
Benchmarks.Trace.AgentWriterBenchmark - Same speed ✔️ More allocations ⚠️

More allocations ⚠️ in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.AgentWriterBenchmark.WriteAndFlushEnrichedTraces‑net472 3.31 KB 3.33 KB 23 B 0.70%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master WriteAndFlushEnrichedTraces net6.0 939μs 45.8ns 177ns 0 0 0 2.7 KB
master WriteAndFlushEnrichedTraces netcoreapp3.1 1.02ms 623ns 2.41μs 0 0 0 2.7 KB
master WriteAndFlushEnrichedTraces net472 1.22ms 61.8ns 231ns 0 0 0 3.31 KB
#7851 WriteAndFlushEnrichedTraces net6.0 945μs 529ns 2.05μs 0 0 0 2.7 KB
#7851 WriteAndFlushEnrichedTraces netcoreapp3.1 1.03ms 66.4ns 239ns 0 0 0 2.7 KB
#7851 WriteAndFlushEnrichedTraces net472 1.24ms 1.76μs 6.82μs 0 0 0 3.33 KB
Benchmarks.Trace.Asm.AppSecBodyBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master AllCycleSimpleBody net6.0 1.09μs 1.29ns 5.01ns 0 0 0 1.22 KB
master AllCycleSimpleBody netcoreapp3.1 1.39μs 7.67ns 46.6ns 0 0 0 1.2 KB
master AllCycleSimpleBody net472 1.03μs 0.897ns 3.47ns 0.194 0 0 1.23 KB
master AllCycleMoreComplexBody net6.0 7.28μs 33.8ns 131ns 0 0 0 4.72 KB
master AllCycleMoreComplexBody netcoreapp3.1 8.98μs 32ns 124ns 0 0 0 4.62 KB
master AllCycleMoreComplexBody net472 7.7μs 4.79ns 18.6ns 0.729 0 0 4.74 KB
master ObjectExtractorSimpleBody net6.0 331ns 1.68ns 7.52ns 0 0 0 280 B
master ObjectExtractorSimpleBody netcoreapp3.1 401ns 2.2ns 12.2ns 0 0 0 272 B
master ObjectExtractorSimpleBody net472 298ns 0.167ns 0.648ns 0.0436 0 0 281 B
master ObjectExtractorMoreComplexBody net6.0 6.4μs 30.1ns 141ns 0 0 0 3.78 KB
master ObjectExtractorMoreComplexBody netcoreapp3.1 7.86μs 29.1ns 113ns 0 0 0 3.69 KB
master ObjectExtractorMoreComplexBody net472 6.67μs 5.3ns 19.8ns 0.602 0 0 3.8 KB
#7851 AllCycleSimpleBody net6.0 1.06μs 5.96ns 40.4ns 0 0 0 1.22 KB
#7851 AllCycleSimpleBody netcoreapp3.1 1.41μs 8.05ns 60.7ns 0 0 0 1.2 KB
#7851 AllCycleSimpleBody net472 1.05μs 2.52ns 9.09ns 0.194 0 0 1.23 KB
#7851 AllCycleMoreComplexBody net6.0 7.11μs 33.4ns 134ns 0 0 0 4.72 KB
#7851 AllCycleMoreComplexBody netcoreapp3.1 9.27μs 42.4ns 164ns 0 0 0 4.62 KB
#7851 AllCycleMoreComplexBody net472 7.67μs 4.27ns 16.5ns 0.727 0 0 4.74 KB
#7851 ObjectExtractorSimpleBody net6.0 319ns 1.78ns 11ns 0 0 0 280 B
#7851 ObjectExtractorSimpleBody netcoreapp3.1 396ns 2.09ns 11.1ns 0 0 0 272 B
#7851 ObjectExtractorSimpleBody net472 300ns 0.631ns 2.44ns 0.0435 0 0 281 B
#7851 ObjectExtractorMoreComplexBody net6.0 6.32μs 31.8ns 149ns 0 0 0 3.78 KB
#7851 ObjectExtractorMoreComplexBody netcoreapp3.1 7.92μs 38.2ns 162ns 0 0 0 3.69 KB
#7851 ObjectExtractorMoreComplexBody net472 6.66μs 3.36ns 12.1ns 0.6 0 0 3.8 KB
Benchmarks.Trace.Asm.AppSecEncoderBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EncodeArgs net6.0 76.6μs 213ns 796ns 0 0 0 32.4 KB
master EncodeArgs netcoreapp3.1 96.3μs 207ns 774ns 0 0 0 32.4 KB
master EncodeArgs net472 112μs 7.66ns 26.5ns 5.03 0 0 32.51 KB
master EncodeLegacyArgs net6.0 145μs 25.7ns 99.6ns 0 0 0 2.15 KB
master EncodeLegacyArgs netcoreapp3.1 197μs 83.5ns 289ns 0 0 0 2.14 KB
master EncodeLegacyArgs net472 264μs 96ns 372ns 0 0 0 2.16 KB
#7851 EncodeArgs net6.0 76.3μs 305ns 1.18μs 0 0 0 32.4 KB
#7851 EncodeArgs netcoreapp3.1 95.8μs 354ns 1.37μs 0 0 0 32.4 KB
#7851 EncodeArgs net472 108μs 13.6ns 47.2ns 4.88 0 0 32.51 KB
#7851 EncodeLegacyArgs net6.0 142μs 52.8ns 205ns 0 0 0 2.15 KB
#7851 EncodeLegacyArgs netcoreapp3.1 197μs 483ns 1.87μs 0 0 0 2.14 KB
#7851 EncodeLegacyArgs net472 263μs 26.1ns 101ns 0 0 0 2.16 KB
Benchmarks.Trace.Asm.AppSecWafBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.Asm.AppSecWafBenchmark.RunWafRealisticBenchmark‑net6.0 5.48 KB 5.14 KB -336 B -6.13%
Benchmarks.Trace.Asm.AppSecWafBenchmark.RunWafRealisticBenchmarkWithAttack‑net6.0 3.5 KB 2.54 KB -960 B -27.40%
Benchmarks.Trace.Asm.AppSecWafBenchmark.RunWafRealisticBenchmark‑net472 8.19 KB 0 b -8.19 KB -100.00%
Benchmarks.Trace.Asm.AppSecWafBenchmark.RunWafRealisticBenchmarkWithAttack‑net472 8.19 KB 0 b -8.19 KB -100.00%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master RunWafRealisticBenchmark net6.0 457μs 3.08μs 30.6μs 0 0 0 5.48 KB
master RunWafRealisticBenchmark netcoreapp3.1 496μs 4.32μs 42.1μs 0 0 0 4.58 KB
master RunWafRealisticBenchmark net472 503μs 607ns 2.27μs 0 0 0 8.19 KB
master RunWafRealisticBenchmarkWithAttack net6.0 311μs 778ns 2.81μs 0 0 0 3.5 KB
master RunWafRealisticBenchmarkWithAttack netcoreapp3.1 352μs 3.19μs 31μs 0 0 0 2.32 KB
master RunWafRealisticBenchmarkWithAttack net472 371μs 373ns 1.29μs 0 0 0 8.19 KB
#7851 RunWafRealisticBenchmark net6.0 425μs 1.11μs 3.85μs 0 0 0 5.14 KB
#7851 RunWafRealisticBenchmark netcoreapp3.1 630μs 19.5μs 195μs 0 0 0 4.58 KB
#7851 RunWafRealisticBenchmark net472 496μs 323ns 1.16μs 0 0 0 0 b
#7851 RunWafRealisticBenchmarkWithAttack net6.0 322μs 1.86μs 14.7μs 0 0 0 2.54 KB
#7851 RunWafRealisticBenchmarkWithAttack netcoreapp3.1 335μs 1.77μs 8.65μs 0 0 0 2.32 KB
#7851 RunWafRealisticBenchmarkWithAttack net472 370μs 505ns 1.82μs 0 0 0 0 b
Benchmarks.Trace.AspNetCoreBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master SendRequest net6.0 61.4μs 113ns 422ns 0 0 0 14.52 KB
master SendRequest netcoreapp3.1 71.1μs 70.2ns 253ns 0 0 0 17.42 KB
master SendRequest net472 0.00553ns 0.00212ns 0.00822ns 0 0 0 0 b
#7851 SendRequest net6.0 60.4μs 59.8ns 224ns 0 0 0 14.46 KB
#7851 SendRequest netcoreapp3.1 71.1μs 68.2ns 255ns 0 0 0 17.36 KB
#7851 SendRequest net472 0.154ns 0.0013ns 0.00469ns 0 0 0 0 b
Benchmarks.Trace.CharSliceBenchmark - Faster 🎉 More allocations ⚠️

Faster 🎉 in #7851

Benchmark base/diff Base Median (ns) Diff Median (ns) Modality
Benchmarks.Trace.CharSliceBenchmark.OptimizedCharSlice‑netcoreapp3.1 1.659 2,817,700.00 1,698,100.00

More allocations ⚠️ in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.CharSliceBenchmark.OptimizedCharSliceWithPool‑net6.0 304 B 976 B 672 B 221.05%

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.CharSliceBenchmark.OptimizedCharSlice‑net6.0 976 B 304 B -672 B -68.85%
Benchmarks.Trace.CharSliceBenchmark.OptimizedCharSlice‑net472 8.19 KB 0 b -8.19 KB -100.00%
Benchmarks.Trace.CharSliceBenchmark.OptimizedCharSliceWithPool‑net472 8.19 KB 0 b -8.19 KB -100.00%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master OriginalCharSlice net6.0 1.89ms 907ns 3.51μs 0 0 0 640.3 KB
master OriginalCharSlice netcoreapp3.1 3.97ms 1.68μs 6.27μs 0 0 0 640.1 KB
master OriginalCharSlice net472 2.64ms 648ns 2.42μs 0 0 0 647.17 KB
master OptimizedCharSlice net6.0 1.4ms 554ns 2.07μs 0 0 0 976 B
master OptimizedCharSlice netcoreapp3.1 2.82ms 905ns 3.39μs 0 0 0 104 B
master OptimizedCharSlice net472 1.99ms 996ns 3.59μs 0 0 0 8.19 KB
master OptimizedCharSliceWithPool net6.0 1.01ms 347ns 1.3μs 0 0 0 304 B
master OptimizedCharSliceWithPool netcoreapp3.1 2ms 2.03μs 7.88μs 0 0 0 104 B
master OptimizedCharSliceWithPool net472 1.15ms 639ns 2.39μs 0 0 0 8.19 KB
#7851 OriginalCharSlice net6.0 1.93ms 2.28μs 8.83μs 0 0 0 640.3 KB
#7851 OriginalCharSlice netcoreapp3.1 3.89ms 1.2μs 4.14μs 0 0 0 640.1 KB
#7851 OriginalCharSlice net472 2.55ms 777ns 3.01μs 0 0 0 647.17 KB
#7851 OptimizedCharSlice net6.0 1.5ms 875ns 3.27μs 0 0 0 304 B
#7851 OptimizedCharSlice netcoreapp3.1 1.7ms 5.94μs 46.4μs 0 0 0 104 B
#7851 OptimizedCharSlice net472 2.02ms 462ns 1.73μs 0 0 0 0 b
#7851 OptimizedCharSliceWithPool net6.0 1.07ms 702ns 2.72μs 0 0 0 976 B
#7851 OptimizedCharSliceWithPool netcoreapp3.1 1.91ms 855ns 3.31μs 0 0 0 104 B
#7851 OptimizedCharSliceWithPool net472 1.13ms 948ns 3.67μs 0 0 0 0 b
Benchmarks.Trace.CIVisibilityProtocolWriterBenchmark - Slower ⚠️ Fewer allocations 🎉

Slower ⚠️ in #7851

Benchmark diff/base Base Median (ns) Diff Median (ns) Modality
Benchmarks.Trace.CIVisibilityProtocolWriterBenchmark.WriteAndFlushEnrichedTraces‑netcoreapp3.1 1.211 625,569.95 757,523.12

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.CIVisibilityProtocolWriterBenchmark.WriteAndFlushEnrichedTraces‑netcoreapp3.1 41.98 KB 41.73 KB -248 B -0.59%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master WriteAndFlushEnrichedTraces net6.0 685μs 1.86μs 7.21μs 0 0 0 41.71 KB
master WriteAndFlushEnrichedTraces netcoreapp3.1 627μs 903ns 3.5μs 0 0 0 41.98 KB
master WriteAndFlushEnrichedTraces net472 832μs 1.3μs 4.88μs 8.33 0 0 56.18 KB
#7851 WriteAndFlushEnrichedTraces net6.0 711μs 3.79μs 20.4μs 0 0 0 41.78 KB
#7851 WriteAndFlushEnrichedTraces netcoreapp3.1 750μs 4.17μs 25.4μs 0 0 0 41.73 KB
#7851 WriteAndFlushEnrichedTraces net472 930μs 3.13μs 12.1μs 8.33 0 0 56.25 KB
Benchmarks.Trace.DbCommandBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.DbCommandBenchmark.ExecuteNonQuery‑net6.0 1.02 KB 968 B -56 B -5.47%
Benchmarks.Trace.DbCommandBenchmark.ExecuteNonQuery‑netcoreapp3.1 1.02 KB 960 B -56 B -5.51%
Benchmarks.Trace.DbCommandBenchmark.ExecuteNonQuery‑net472 987 B 931 B -56 B -5.67%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master ExecuteNonQuery net6.0 1.93μs 9.98ns 47.9ns 0 0 0 1.02 KB
master ExecuteNonQuery netcoreapp3.1 2.47μs 11.2ns 40.5ns 0 0 0 1.02 KB
master ExecuteNonQuery net472 2.71μs 1.89ns 7.31ns 0.15 0 0 987 B
#7851 ExecuteNonQuery net6.0 1.87μs 9.48ns 41.3ns 0 0 0 968 B
#7851 ExecuteNonQuery netcoreapp3.1 2.51μs 7.97ns 30.9ns 0 0 0 960 B
#7851 ExecuteNonQuery net472 2.65μs 2.88ns 11.1ns 0.147 0 0 931 B
Benchmarks.Trace.ElasticsearchBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearchAsync‑net472 1.1 KB 1.04 KB -56 B -5.10%
Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearchAsync‑netcoreapp3.1 1.08 KB 1.02 KB -56 B -5.19%
Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearch‑net472 1.04 KB 987 B -56 B -5.37%
Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearch‑net6.0 1.03 KB 976 B -56 B -5.43%
Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearch‑netcoreapp3.1 1.03 KB 976 B -56 B -5.43%
Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearchAsync‑net6.0 1.01 KB 952 B -56 B -5.56%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master CallElasticsearch net6.0 1.76μs 8.03ns 30ns 0 0 0 1.03 KB
master CallElasticsearch netcoreapp3.1 2.23μs 11.7ns 56.2ns 0 0 0 1.03 KB
master CallElasticsearch net472 3.57μs 3.38ns 13.1ns 0.16 0 0 1.04 KB
master CallElasticsearchAsync net6.0 1.79μs 8.33ns 32.3ns 0 0 0 1.01 KB
master CallElasticsearchAsync netcoreapp3.1 2.44μs 8.58ns 33.2ns 0 0 0 1.08 KB
master CallElasticsearchAsync net472 3.71μs 1.19ns 4.6ns 0.165 0 0 1.1 KB
#7851 CallElasticsearch net6.0 1.71μs 6.95ns 26.9ns 0 0 0 976 B
#7851 CallElasticsearch netcoreapp3.1 2.24μs 4.95ns 19.2ns 0 0 0 976 B
#7851 CallElasticsearch net472 3.49μs 5.64ns 21.8ns 0.14 0 0 987 B
#7851 CallElasticsearchAsync net6.0 1.8μs 8.58ns 35.4ns 0 0 0 952 B
#7851 CallElasticsearchAsync netcoreapp3.1 2.4μs 9.45ns 35.3ns 0 0 0 1.02 KB
#7851 CallElasticsearchAsync net472 3.65μs 2.62ns 10.1ns 0.163 0 0 1.04 KB
Benchmarks.Trace.GraphQLBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.GraphQLBenchmark.ExecuteAsync‑net6.0 952 B 896 B -56 B -5.88%
Benchmarks.Trace.GraphQLBenchmark.ExecuteAsync‑netcoreapp3.1 952 B 896 B -56 B -5.88%
Benchmarks.Trace.GraphQLBenchmark.ExecuteAsync‑net472 915 B 859 B -56 B -6.12%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master ExecuteAsync net6.0 1.82μs 5.61ns 21.7ns 0 0 0 952 B
master ExecuteAsync netcoreapp3.1 2.35μs 10.9ns 43.4ns 0 0 0 952 B
master ExecuteAsync net472 2.67μs 3.16ns 12.2ns 0.133 0 0 915 B
#7851 ExecuteAsync net6.0 1.77μs 7ns 26.2ns 0 0 0 896 B
#7851 ExecuteAsync netcoreapp3.1 2.4μs 7.34ns 28.4ns 0 0 0 896 B
#7851 ExecuteAsync net472 2.51μs 3.95ns 15.3ns 0.125 0 0 859 B
Benchmarks.Trace.HttpClientBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.HttpClientBenchmark.SendAsync‑net472 3.18 KB 3.12 KB -56 B -1.76%
Benchmarks.Trace.HttpClientBenchmark.SendAsync‑netcoreapp3.1 2.9 KB 2.84 KB -56 B -1.93%
Benchmarks.Trace.HttpClientBenchmark.SendAsync‑net6.0 2.36 KB 2.3 KB -56 B -2.37%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master SendAsync net6.0 6.79μs 10ns 38.9ns 0 0 0 2.36 KB
master SendAsync netcoreapp3.1 8.96μs 35ns 135ns 0 0 0 2.9 KB
master SendAsync net472 12.2μs 10.5ns 40.6ns 0.488 0 0 3.18 KB
#7851 SendAsync net6.0 6.69μs 19.4ns 75.2ns 0 0 0 2.3 KB
#7851 SendAsync netcoreapp3.1 8.77μs 15.9ns 61.7ns 0 0 0 2.84 KB
#7851 SendAsync net472 12.1μs 7.04ns 27.3ns 0.483 0 0 3.12 KB
Benchmarks.Trace.Iast.StringAspectsBenchmark - Same speed ✔️ More allocations ⚠️

More allocations ⚠️ in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.Iast.StringAspectsBenchmark.StringConcatAspectBenchmark‑net6.0 250.62 KB 259.9 KB 9.28 KB 3.70%
Benchmarks.Trace.Iast.StringAspectsBenchmark.StringConcatBenchmark‑net6.0 43.36 KB 43.94 KB 576 B 1.33%
Benchmarks.Trace.Iast.StringAspectsBenchmark.StringConcatAspectBenchmark‑net472 278.53 KB 281.3 KB 2.78 KB 1.00%

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.Iast.StringAspectsBenchmark.StringConcatBenchmark‑netcoreapp3.1 44.04 KB 42.82 KB -1.22 KB -2.78%
Benchmarks.Trace.Iast.StringAspectsBenchmark.StringConcatAspectBenchmark‑netcoreapp3.1 272.86 KB 257.44 KB -15.42 KB -5.65%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master StringConcatBenchmark net6.0 45μs 249ns 1.41μs 0 0 0 43.36 KB
master StringConcatBenchmark netcoreapp3.1 48.4μs 200ns 720ns 0 0 0 44.04 KB
master StringConcatBenchmark net472 57.5μs 127ns 459ns 0 0 0 57.34 KB
master StringConcatAspectBenchmark net6.0 445μs 2.37μs 12.1μs 0 0 0 250.62 KB
master StringConcatAspectBenchmark netcoreapp3.1 528μs 2.53μs 10.1μs 0 0 0 272.86 KB
master StringConcatAspectBenchmark net472 411μs 2.21μs 12.5μs 0 0 0 278.53 KB
#7851 StringConcatBenchmark net6.0 50μs 287ns 1.92μs 0 0 0 43.94 KB
#7851 StringConcatBenchmark netcoreapp3.1 52.9μs 534ns 5.26μs 0 0 0 42.82 KB
#7851 StringConcatBenchmark net472 57.3μs 146ns 548ns 0 0 0 57.34 KB
#7851 StringConcatAspectBenchmark net6.0 457μs 950ns 3.43μs 0 0 0 259.9 KB
#7851 StringConcatAspectBenchmark netcoreapp3.1 497μs 2.44μs 10μs 0 0 0 257.44 KB
#7851 StringConcatAspectBenchmark net472 404μs 2.13μs 10.2μs 0 0 0 281.3 KB
Benchmarks.Trace.ILoggerBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 2.64μs 13.6ns 67.9ns 0 0 0 1.7 KB
master EnrichedLog netcoreapp3.1 3.56μs 15.7ns 60.6ns 0 0 0 1.7 KB
master EnrichedLog net472 3.82μs 2.9ns 11.2ns 0.245 0 0 1.64 KB
#7851 EnrichedLog net6.0 2.6μs 12.9ns 56ns 0 0 0 1.7 KB
#7851 EnrichedLog netcoreapp3.1 3.56μs 16.2ns 62.9ns 0 0 0 1.7 KB
#7851 EnrichedLog net472 3.77μs 2.68ns 10.4ns 0.245 0 0 1.64 KB
Benchmarks.Trace.Log4netBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 124μs 129ns 483ns 0 0 0 4.31 KB
master EnrichedLog netcoreapp3.1 127μs 70.9ns 256ns 0 0 0 4.31 KB
master EnrichedLog net472 168μs 128ns 495ns 0 0 0 4.52 KB
#7851 EnrichedLog net6.0 123μs 71.7ns 258ns 0 0 0 4.31 KB
#7851 EnrichedLog netcoreapp3.1 129μs 98.7ns 369ns 0 0 0 4.31 KB
#7851 EnrichedLog net472 165μs 141ns 547ns 0 0 0 4.51 KB
Benchmarks.Trace.NLogBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 4.91μs 23.1ns 92.4ns 0 0 0 2.26 KB
master EnrichedLog netcoreapp3.1 6.93μs 26.5ns 103ns 0 0 0 2.26 KB
master EnrichedLog net472 7.38μs 5.92ns 22.9ns 0.297 0 0 2.08 KB
#7851 EnrichedLog net6.0 5.01μs 23.2ns 89.8ns 0 0 0 2.26 KB
#7851 EnrichedLog netcoreapp3.1 6.79μs 14.4ns 54ns 0 0 0 2.26 KB
#7851 EnrichedLog net472 7.44μs 5.68ns 22ns 0.295 0 0 2.08 KB
Benchmarks.Trace.RedisBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.RedisBenchmark.SendReceive‑net6.0 1.2 KB 1.14 KB -56 B -4.67%
Benchmarks.Trace.RedisBenchmark.SendReceive‑netcoreapp3.1 1.2 KB 1.14 KB -56 B -4.67%
Benchmarks.Trace.RedisBenchmark.SendReceive‑net472 1.2 KB 1.15 KB -57 B -4.73%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master SendReceive net6.0 1.94μs 8.91ns 34.5ns 0 0 0 1.2 KB
master SendReceive netcoreapp3.1 2.54μs 10.8ns 41.9ns 0 0 0 1.2 KB
master SendReceive net472 2.96μs 2.36ns 8.82ns 0.191 0 0 1.2 KB
#7851 SendReceive net6.0 1.9μs 9.92ns 47.6ns 0 0 0 1.14 KB
#7851 SendReceive netcoreapp3.1 2.55μs 8.85ns 34.3ns 0 0 0 1.14 KB
#7851 SendReceive net472 3.03μs 2.79ns 10.8ns 0.167 0 0 1.15 KB
Benchmarks.Trace.SerilogBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 4.29μs 1.1ns 4.11ns 0 0 0 1.58 KB
master EnrichedLog netcoreapp3.1 5.94μs 15.6ns 60.6ns 0 0 0 1.63 KB
master EnrichedLog net472 6.55μs 5.18ns 20.1ns 0.293 0 0 2.03 KB
#7851 EnrichedLog net6.0 4.3μs 2.86ns 10.7ns 0 0 0 1.58 KB
#7851 EnrichedLog netcoreapp3.1 5.5μs 20ns 77.4ns 0 0 0 1.63 KB
#7851 EnrichedLog net472 6.38μs 8.32ns 32.2ns 0.32 0 0 2.03 KB
Benchmarks.Trace.SpanBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.SpanBenchmark.StartFinishScope‑net6.0 696 B 640 B -56 B -8.05%
Benchmarks.Trace.SpanBenchmark.StartFinishScope‑netcoreapp3.1 696 B 640 B -56 B -8.05%
Benchmarks.Trace.SpanBenchmark.StartFinishScope‑net472 658 B 602 B -56 B -8.51%
Benchmarks.Trace.SpanBenchmark.StartFinishSpan‑net472 578 B 522 B -56 B -9.69%
Benchmarks.Trace.SpanBenchmark.StartFinishSpan‑net6.0 576 B 520 B -56 B -9.72%
Benchmarks.Trace.SpanBenchmark.StartFinishSpan‑netcoreapp3.1 576 B 520 B -56 B -9.72%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master StartFinishSpan net6.0 790ns 3.61ns 14.4ns 0 0 0 576 B
master StartFinishSpan netcoreapp3.1 960ns 0.356ns 1.38ns 0 0 0 576 B
master StartFinishSpan net472 917ns 0.121ns 0.471ns 0.0916 0 0 578 B
master StartFinishScope net6.0 937ns 0.434ns 1.68ns 0 0 0 696 B
master StartFinishScope netcoreapp3.1 1.13μs 5.83ns 26.7ns 0 0 0 696 B
master StartFinishScope net472 1.1μs 0.186ns 0.721ns 0.0993 0 0 658 B
#7851 StartFinishSpan net6.0 731ns 4.07ns 24.8ns 0 0 0 520 B
#7851 StartFinishSpan netcoreapp3.1 925ns 4.59ns 18.9ns 0 0 0 520 B
#7851 StartFinishSpan net472 899ns 0.101ns 0.377ns 0.0811 0 0 522 B
#7851 StartFinishScope net6.0 915ns 4.52ns 18.6ns 0 0 0 640 B
#7851 StartFinishScope netcoreapp3.1 1.1μs 5.55ns 24.2ns 0 0 0 640 B
#7851 StartFinishScope net472 1.09μs 0.813ns 3.15ns 0.0927 0 0 602 B
Benchmarks.Trace.TraceAnnotationsBenchmark - Same speed ✔️ Fewer allocations 🎉

Fewer allocations 🎉 in #7851

Benchmark Base Allocated Diff Allocated Change Change %
Benchmarks.Trace.TraceAnnotationsBenchmark.RunOnMethodBegin‑net6.0 696 B 640 B -56 B -8.05%
Benchmarks.Trace.TraceAnnotationsBenchmark.RunOnMethodBegin‑netcoreapp3.1 696 B 640 B -56 B -8.05%
Benchmarks.Trace.TraceAnnotationsBenchmark.RunOnMethodBegin‑net472 658 B 602 B -56 B -8.51%

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master RunOnMethodBegin net6.0 1.08μs 1.43ns 5.15ns 0 0 0 696 B
master RunOnMethodBegin netcoreapp3.1 1.38μs 6.5ns 25.2ns 0 0 0 696 B
master RunOnMethodBegin net472 1.44μs 1.51ns 5.85ns 0.101 0 0 658 B
#7851 RunOnMethodBegin net6.0 1.03μs 5.67ns 33.5ns 0 0 0 640 B
#7851 RunOnMethodBegin netcoreapp3.1 1.34μs 6.68ns 29.1ns 0 0 0 640 B
#7851 RunOnMethodBegin net472 1.37μs 1.23ns 4.26ns 0.0898 0 0 602 B

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dd-trace-dotnet-ci-bot bot commented Nov 21, 2025 •
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Execution-Time Benchmarks Report ⏱️

Execution-time results for samples comparing This PR (7851) and master.

✅ No regressions detected - check the details below

Full Metrics Comparison

FakeDbCommand

Metric Master (Mean ± 95% CI) Current (Mean ± 95% CI) Change Status
.NET Framework 4.8 - Baseline
duration75.54 ± (75.66 - 76.57) ms75.19 ± (75.38 - 76.05) ms-0.5%✅
.NET Framework 4.8 - Bailout
duration78.44 ± (78.48 - 79.27) ms79.66 ± (79.65 - 80.51) ms+1.6%✅⬆️
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration1056.60 ± (1061.10 - 1072.97) ms1074.54 ± (1076.03 - 1088.80) ms+1.7%✅⬆️
.NET Core 3.1 - Baseline
process.internal_duration_ms22.97 ± (22.88 - 23.06) ms22.98 ± (22.92 - 23.05) ms+0.1%✅⬆️
process.time_to_main_ms87.39 ± (86.98 - 87.79) ms87.39 ± (87.05 - 87.73) ms-0.0%✅
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed10.93 ± (10.93 - 10.94) MB10.92 ± (10.92 - 10.93) MB-0.1%✅
runtime.dotnet.threads.count12 ± (12 - 12)12 ± (12 - 12)+0.0%✅
.NET Core 3.1 - Bailout
process.internal_duration_ms22.71 ± (22.65 - 22.77) ms22.91 ± (22.85 - 22.98) ms+0.9%✅⬆️
process.time_to_main_ms87.50 ± (87.17 - 87.84) ms89.71 ± (89.33 - 90.09) ms+2.5%✅⬆️
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed10.97 ± (10.97 - 10.97) MB10.96 ± (10.95 - 10.96) MB-0.1%✅
runtime.dotnet.threads.count13 ± (13 - 13)13 ± (13 - 13)+0.0%✅
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms219.96 ± (218.38 - 221.54) ms220.94 ± (219.53 - 222.35) ms+0.4%✅⬆️
process.time_to_main_ms496.03 ± (494.81 - 497.24) ms501.82 ± (500.68 - 502.96) ms+1.2%✅⬆️
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed47.77 ± (47.75 - 47.79) MB47.79 ± (47.77 - 47.81) MB+0.0%✅⬆️
runtime.dotnet.threads.count28 ± (28 - 28)28 ± (28 - 28)+0.4%✅⬆️
.NET 6 - Baseline
process.internal_duration_ms21.76 ± (21.68 - 21.83) ms21.94 ± (21.87 - 22.00) ms+0.8%✅⬆️
process.time_to_main_ms75.80 ± (75.44 - 76.15) ms76.86 ± (76.55 - 77.17) ms+1.4%✅⬆️
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed10.63 ± (10.62 - 10.63) MB10.64 ± (10.64 - 10.64) MB+0.2%✅⬆️
runtime.dotnet.threads.count10 ± (10 - 10)10 ± (10 - 10)+0.0%✅
.NET 6 - Bailout
process.internal_duration_ms21.81 ± (21.74 - 21.88) ms22.13 ± (22.05 - 22.21) ms+1.5%✅⬆️
process.time_to_main_ms77.97 ± (77.66 - 78.28) ms79.50 ± (79.09 - 79.90) ms+2.0%✅⬆️
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed10.70 ± (10.70 - 10.71) MB10.68 ± (10.67 - 10.68) MB-0.2%✅
runtime.dotnet.threads.count11 ± (11 - 11)11 ± (11 - 11)+0.0%✅
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms211.50 ± (210.08 - 212.92) ms211.83 ± (210.13 - 213.54) ms+0.2%✅⬆️
process.time_to_main_ms467.65 ± (466.65 - 468.65) ms469.85 ± (468.72 - 470.99) ms+0.5%✅⬆️
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed47.99 ± (47.97 - 48.02) MB48.02 ± (47.99 - 48.04) MB+0.1%✅⬆️
runtime.dotnet.threads.count28 ± (28 - 28)28 ± (28 - 28)-0.0%✅
.NET 8 - Baseline
process.internal_duration_ms20.16 ± (20.08 - 20.23) ms19.98 ± (19.92 - 20.04) ms-0.9%✅
process.time_to_main_ms76.89 ± (76.50 - 77.28) ms76.55 ± (76.21 - 76.90) ms-0.4%✅
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed7.67 ± (7.67 - 7.68) MB7.66 ± (7.65 - 7.66) MB-0.2%✅
runtime.dotnet.threads.count10 ± (10 - 10)10 ± (10 - 10)+0.0%✅
.NET 8 - Bailout
process.internal_duration_ms19.83 ± (19.77 - 19.88) ms20.11 ± (20.03 - 20.18) ms+1.4%✅⬆️
process.time_to_main_ms76.76 ± (76.39 - 77.13) ms77.34 ± (76.96 - 77.72) ms+0.8%✅⬆️
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed7.73 ± (7.72 - 7.73) MB7.73 ± (7.72 - 7.74) MB-0.0%✅
runtime.dotnet.threads.count11 ± (11 - 11)11 ± (11 - 11)+0.0%✅
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms191.97 ± (191.08 - 192.85) ms193.48 ± (192.69 - 194.28) ms+0.8%✅⬆️
process.time_to_main_ms454.27 ± (453.29 - 455.25) ms457.97 ± (456.88 - 459.06) ms+0.8%✅⬆️
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%✅
runtime.dotnet.mem.committed36.49 ± (36.45 - 36.53) MB36.42 ± (36.38 - 36.47) MB-0.2%✅
runtime.dotnet.threads.count27 ± (27 - 27)27 ± (27 - 27)+0.1%✅⬆️

HttpMessageHandler

Metric Master (Mean ± 95% CI) Current (Mean ± 95% CI) Change Status
.NET Framework 4.8 - Baseline
duration194.92 ± (194.70 - 195.36) ms198.55 ± (198.45 - 199.50) ms+1.9%✅⬆️
.NET Framework 4.8 - Bailout
duration198.30 ± (198.03 - 198.51) ms202.50 ± (202.26 - 203.40) ms+2.1%✅⬆️
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration1123.56 ± (1125.23 - 1133.30) ms1172.50 ± (1175.64 - 1184.30) ms+4.4%✅⬆️
.NET Core 3.1 - Baseline
process.internal_duration_ms190.14 ± (189.82 - 190.46) ms195.73 ± (195.16 - 196.29) ms+2.9%✅⬆️
process.time_to_main_ms81.84 ± (81.64 - 82.03) ms88.10 ± (87.78 - 88.43) ms+7.7%✅⬆️
runtime.dotnet.exceptions.count3 ± (3 - 3)3 ± (3 - 3)+0.0%✅
runtime.dotnet.mem.committed16.07 ± (16.04 - 16.09) MB16.30 ± (16.29 - 16.32) MB+1.5%✅⬆️
runtime.dotnet.threads.count20 ± (20 - 20)20 ± (20 - 20)+1.0%✅⬆️
.NET Core 3.1 - Bailout
process.internal_duration_ms190.16 ± (189.76 - 190.57) ms194.78 ± (194.20 - 195.37) ms+2.4%✅⬆️
process.time_to_main_ms83.18 ± (82.97 - 83.39) ms89.15 ± (88.89 - 89.42) ms+7.2%✅⬆️
runtime.dotnet.exceptions.count3 ± (3 - 3)3 ± (3 - 3)+0.0%✅
runtime.dotnet.mem.committed16.14 ± (16.12 - 16.16) MB16.30 ± (16.28 - 16.32) MB+1.0%✅⬆️
runtime.dotnet.threads.count21 ± (20 - 21)21 ± (21 - 21)+1.1%✅⬆️
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms407.30 ± (404.37 - 410.23) ms414.15 ± (411.76 - 416.54) ms+1.7%✅⬆️
process.time_to_main_ms478.02 ± (477.48 - 478.57) ms502.50 ± (501.19 - 503.80) ms+5.1%✅⬆️
runtime.dotnet.exceptions.count3 ± (3 - 3)3 ± (3 - 3)+0.0%✅
runtime.dotnet.mem.committed58.85 ± (58.75 - 58.95) MB59.29 ± (59.24 - 59.34) MB+0.8%✅⬆️
runtime.dotnet.threads.count29 ± (29 - 30)29 ± (29 - 29)-0.1%✅
.NET 6 - Baseline
process.internal_duration_ms193.89 ± (193.56 - 194.22) ms198.01 ± (197.56 - 198.47) ms+2.1%✅⬆️
process.time_to_main_ms70.73 ± (70.57 - 70.89) ms76.47 ± (76.19 - 76.75) ms+8.1%✅⬆️
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%✅
runtime.dotnet.mem.committed16.40 ± (16.37 - 16.43) MB16.53 ± (16.51 - 16.55) MB+0.8%✅⬆️
runtime.dotnet.threads.count19 ± (19 - 19)19 ± (19 - 19)+0.2%✅⬆️
.NET 6 - Bailout
process.internal_duration_ms194.00 ± (193.71 - 194.28) ms198.81 ± (198.28 - 199.35) ms+2.5%✅⬆️
process.time_to_main_ms72.27 ± (72.11 - 72.42) ms77.82 ± (77.57 - 78.07) ms+7.7%✅⬆️
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%✅
runtime.dotnet.mem.committed16.33 ± (16.23 - 16.44) MB16.55 ± (16.53 - 16.56) MB+1.3%✅⬆️
runtime.dotnet.threads.count20 ± (20 - 20)20 ± (20 - 20)+2.1%✅⬆️
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms418.71 ± (416.09 - 421.34) ms426.56 ± (424.51 - 428.61) ms+1.9%✅⬆️
process.time_to_main_ms447.45 ± (446.80 - 448.09) ms470.47 ± (469.21 - 471.73) ms+5.1%✅⬆️
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%✅
runtime.dotnet.mem.committed59.26 ± (59.16 - 59.36) MB59.53 ± (59.46 - 59.60) MB+0.4%✅⬆️
runtime.dotnet.threads.count30 ± (29 - 30)29 ± (29 - 29)-0.4%✅
.NET 8 - Baseline
process.internal_duration_ms192.07 ± (191.81 - 192.34) ms197.43 ± (196.99 - 197.88) ms+2.8%✅⬆️
process.time_to_main_ms70.67 ± (70.47 - 70.87) ms75.57 ± (75.33 - 75.82) ms+6.9%✅⬆️
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%✅
runtime.dotnet.mem.committed11.76 ± (11.74 - 11.78) MB11.89 ± (11.87 - 11.90) MB+1.1%✅⬆️
runtime.dotnet.threads.count18 ± (18 - 18)19 ± (18 - 19)+2.0%✅⬆️
.NET 8 - Bailout
process.internal_duration_ms191.55 ± (191.29 - 191.80) ms195.47 ± (195.04 - 195.90) ms+2.0%✅⬆️
process.time_to_main_ms71.50 ± (71.40 - 71.60) ms76.26 ± (76.04 - 76.47) ms+6.7%✅⬆️
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%✅
runtime.dotnet.mem.committed11.83 ± (11.80 - 11.85) MB11.99 ± (11.98 - 12.01) MB+1.4%✅⬆️
runtime.dotnet.threads.count19 ± (19 - 19)19 ± (19 - 19)+0.5%✅⬆️
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms370.49 ± (369.13 - 371.86) ms375.37 ± (373.77 - 376.98) ms+1.3%✅⬆️
process.time_to_main_ms438.32 ± (437.58 - 439.07) ms448.30 ± (447.23 - 449.38) ms+2.3%✅⬆️
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%✅
runtime.dotnet.mem.committed47.88 ± (47.84 - 47.91) MB47.92 ± (47.87 - 47.97) MB+0.1%✅⬆️
runtime.dotnet.threads.count29 ± (29 - 29)29 ± (29 - 29)-0.0%✅
Comparison explanation

Execution-time benchmarks measure the whole time it takes to execute a program, and are intended to measure the one-off costs. Cases where the execution time results for the PR are worse than latest master results are highlighted in **red**. The following thresholds were used for comparing the execution times:

  • Welch test with statistical test for significance of 5%
  • Only results indicating a difference greater than 5% and 5 ms are considered.

Note that these results are based on a single point-in-time result for each branch. For full results, see the dashboard.

Graphs show the p99 interval based on the mean and StdDev of the test run, as well as the mean value of the run (shown as a diamond below the graph).

Duration charts
FakeDbCommand (.NET Framework 4.8) 
gantt
    title Execution time (ms) FakeDbCommand (.NET Framework 4.8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (76ms)  : 71, 81
    master - mean (76ms)  : 70, 83

    section Bailout
    This PR (7851) - mean (80ms)  : 74, 86
    master - mean (79ms)  : 73, 85

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (1,082ms)  : 991, 1174
    master - mean (1,067ms)  : 976, 1158
Loading
FakeDbCommand (.NET Core 3.1) 
gantt
    title Execution time (ms) FakeDbCommand (.NET Core 3.1)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (118ms)  : 110, 126
    master - mean (118ms)  : 111, 125

    section Bailout
    This PR (7851) - mean (120ms)  : 112, 128
    master - mean (118ms)  : 111, 125

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (764ms)  : 718, 810
    master - mean (758ms)  : 720, 796
Loading
FakeDbCommand (.NET 6) 
gantt
    title Execution time (ms) FakeDbCommand (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (106ms)  : 100, 112
    master - mean (105ms)  : 98, 111

    section Bailout
    This PR (7851) - mean (109ms)  : 102, 116
    master - mean (107ms)  : 100, 114

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (716ms)  : 665, 767
    master - mean (719ms)  : 677, 762
Loading
FakeDbCommand (.NET 8) 
gantt
    title Execution time (ms) FakeDbCommand (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (105ms)  : 98, 112
    master - mean (106ms)  : 98, 114

    section Bailout
    This PR (7851) - mean (106ms)  : 98, 114
    master - mean (105ms)  : 98, 112

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (691ms)  : 665, 717
    master - mean (690ms)  : 661, 720
Loading
HttpMessageHandler (.NET Framework 4.8) 
gantt
    title Execution time (ms) HttpMessageHandler (.NET Framework 4.8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (199ms)  : 191, 207
    master - mean (195ms)  : 192, 198

    section Bailout
    This PR (7851) - mean (203ms)  : 195, 210
    master - mean (198ms)  : 196, 201

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (1,180ms)  : 1117, 1243
    master - mean (1,129ms)  : 1071, 1188
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HttpMessageHandler (.NET Core 3.1) 
gantt
    title Execution time (ms) HttpMessageHandler (.NET Core 3.1)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (294ms)  : 283, 306
    master - mean (280ms)  : 276, 285

    section Bailout
    This PR (7851) - mean (294ms)  : 280, 309
    master - mean (281ms)  : 276, 287

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (980ms)  : crit, 937, 1023
    master - mean (924ms)  : 880, 969
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HttpMessageHandler (.NET 6) 
gantt
    title Execution time (ms) HttpMessageHandler (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (285ms)  : 274, 295
    master - mean (274ms)  : 267, 280

    section Bailout
    This PR (7851) - mean (287ms)  : 275, 298
    master - mean (275ms)  : 270, 279

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (960ms)  : crit, 910, 1010
    master - mean (902ms)  : 860, 944
Loading
HttpMessageHandler (.NET 8) 
gantt
    title Execution time (ms) HttpMessageHandler (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7851) - mean (285ms)  : 276, 294
    master - mean (273ms)  : 267, 278

    section Bailout
    This PR (7851) - mean (284ms)  : 273, 294
    master - mean (273ms)  : 269, 276

    section CallTarget+Inlining+NGEN
    This PR (7851) - mean (887ms)  : crit, 846, 928
    master - mean (839ms)  : 813, 865
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datadog-datadog-prod-us1 bot commented Nov 24, 2025 •
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⚠️ Tests

⚠️ Warnings

🧪 28 Tests failed

TestInstrumentedUnitTests from Datadog.Trace.Security.IntegrationTests.Iast.IastInstrumentationUnitTests (Datadog) 
Expected exit code: 0, actual exit code: 1. Message: [xUnit.net 00:00:04.1222018]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated [FAIL]
[xUnit.net 00:00:04.1301252]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated5 [FAIL]
[xUnit.net 00:00:04.1320632]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated2 [FAIL]
TestInstrumentedUnitTests from Datadog.Trace.Security.IntegrationTests.Iast.IastInstrumentationUnitTests (Datadog) 
Expected exit code: 0, actual exit code: 1. Message: [xUnit.net 00:00:04.2902342]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated [FAIL]
[xUnit.net 00:00:04.3056479]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated5 [FAIL]
[xUnit.net 00:00:04.3076510]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated2 [FAIL]
TestInstrumentedUnitTests from Datadog.Trace.Security.IntegrationTests.Iast.IastInstrumentationUnitTests (Datadog) 
Expected exit code: 0, actual exit code: 1. Message: [xUnit.net 00:00:03.5326942]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated [FAIL]
[xUnit.net 00:00:03.5475416]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated5 [FAIL]
[xUnit.net 00:00:03.5483687]     Samples.InstrumentedTests.Iast.Vulnerabilities.ProcessStartTests.GivenAProcess_WhenStart_SpanIsGenerated2 [FAIL]
View all

ℹ️ Info

❄️ No new flaky tests detected

This comment will be updated automatically if new data arrives.
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area:benchmarks Benchmarks, throughput tests, Crank, Bombardier, etc area:tracer The core tracer library (Datadog.Trace, does not include OpenTracing, native code, or integrations) type:performance Performance, speed, latency, resource usage (CPU, memory)

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@andrewlock