Update dependencies and refactor Fixed Width Parser for performance by GabrielMarquezMatte · Pull Request #46 · GabrielMarquezMatte/FixedWidthParser

GabrielMarquezMatte · 2026-07-17T14:31:05Z

This pull request makes several important improvements and updates across the codebase, focusing on code quality, dependency management, and public API consistency. The most significant changes include updating workflow configurations to support the develop branch, upgrading dependencies and analyzers, refactoring public API return types for consistency, and internal code cleanups.

Workflow and Dependency Updates:

Updated all GitHub Actions workflows to use actions/setup-dotnet@v6 and added support for the develop branch in CI and CodeQL triggers. [1] [2] [3] [4] [5] [6] [7] [8]
Upgraded analyzer and dependency versions in Directory.Build.props and FixedWidthParser.csproj (e.g., SonarAnalyzer.CSharp, Meziantou.Analyzer, Microsoft.CodeAnalysis.NetAnalyzers, csFastFloat, System.IO.Pipelines), and removed the unused Microsoft.CodeAnalysis.BannedApiAnalyzers package. [1] [2]

Public API Refactoring:

Changed the return types of all Read, ReadFile, and ReadAsync methods in FixedWidth.cs and FixedWidthUtf8.cs to use the generic FixedWidthRecordEnumerable<TModel, GeneratedLineParser<TModel>> and related types instead of the old GeneratedFixedWidthRecordEnumerable<TModel> types, improving API consistency and extensibility. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Internal Code Improvements:

Refactored DateTime type detection into a helper method IsDateTimeType in FixedWidthModelGenerator.cs for better code reuse and clarity. [1] [2] [3]
Changed the visibility of ColumnLayoutValidator from public to internal, restricting its usage to within the assembly.

Project File Cleanups:

Removed legacy or redundant MSBuild properties from Directory.Build.props to simplify the build configuration.

These changes collectively improve maintainability, code quality, and the developer experience.

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 5 to 6. - [Release notes](https://github.com/actions/setup-dotnet/releases) - [Commits](actions/setup-dotnet@v5...v6) --- updated-dependencies: - dependency-name: actions/setup-dotnet dependency-version: '6' dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>

--- updated-dependencies: - dependency-name: csFastFloat dependency-version: 4.1.6 dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com>

--- updated-dependencies: - dependency-name: Microsoft.Testing.Extensions.CodeCoverage dependency-version: 18.9.0 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>

--- updated-dependencies: - dependency-name: Microsoft.Testing.Extensions.TrxReport dependency-version: 2.3.2 dependency-type: direct:production update-type: version-update:semver-minor - dependency-name: Microsoft.Testing.Extensions.TrxReport dependency-version: 2.3.2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>

--- updated-dependencies: - dependency-name: System.IO.Pipelines dependency-version: 10.0.10 dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com>

- Updated the FixedWidthAsyncRecordEnumerable and FixedWidthRecordEnumerable classes to utilize a new generic RecordEnumeratorCore, allowing for better type handling and performance optimizations. - Introduced ISource interface for managing buffered record reading, implemented by StreamSource and TextReaderSource. - Refactored line parsing strategies to implement a new IRecordLineParser interface, enhancing type safety and reducing allocations. - Removed obsolete Utf8AsyncRecordEnumeratorCore and Utf8RecordEnumeratorCore classes, consolidating functionality into the new generic structure. - Updated tests to reflect changes in enumerator types, ensuring they remain value types for allocation-free iteration.

- Updated FixedWidthUtf8.cs to replace GeneratedUtf8FixedWidthRecordEnumerable with a more generic Utf8FixedWidthRecordEnumerable that accepts a line parser type. - Refactored ColumnParserFactory and Utf8ColumnParserFactory to streamline date parsing logic using a new BuildExact method for better code reuse. - Removed GeneratedFixedWidthAsyncRecordEnumerable and GeneratedFixedWidthRecordEnumerable classes to simplify the codebase and reduce redundancy. - Updated various reader classes (FixedWidthAsyncRecordEnumerable, FixedWidthByteReader, FixedWidthReader, etc.) to utilize the new generic record enumerable structure. - Enhanced Utf8FixedWidthAsyncRecordEnumerable and Utf8FixedWidthRecordEnumerable to accept a line parser type, improving flexibility and maintainability. - Adjusted tests in GeneratedUtf8ReaderTests to reflect changes in the enumerable structure and ensure continued functionality.

Bumps Meziantou.Analyzer from 3.0.122 to 3.0.123 Bumps Microsoft.CodeAnalysis.NetAnalyzers from 11.0.100-preview.5.26302.115 to 11.0.100-preview.6.26359.118 Bumps SonarAnalyzer.CSharp from 10.28.0.143324 to 10.29.0.143774 --- updated-dependencies: - dependency-name: Meziantou.Analyzer dependency-version: 3.0.123 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: analyzers - dependency-name: Microsoft.CodeAnalysis.NetAnalyzers dependency-version: 11.0.100-preview.6.26359.118 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: analyzers - dependency-name: SonarAnalyzer.CSharp dependency-version: 10.29.0.143774 dependency-type: direct:production update-type: version-update:semver-minor dependency-group: analyzers ... Signed-off-by: dependabot[bot] <support@github.com>

…FixedWidthParser/develop/System.IO.Pipelines-10.0.10 Bump System.IO.Pipelines from 10.0.9 to 10.0.10

…s/FixedWidthParser.Generator.Tests/develop/multi-747a3f1faf Bump Microsoft.Testing.Extensions.TrxReport from 2.2.3 to 2.3.2

…elop/csFastFloat-4.1.6

…FixedWidthParser/develop/csFastFloat-4.1.6 Bump csFastFloat from 4.1.5 to 4.1.6

…ests/develop/Microsoft.Testing.Extensions.CodeCoverage-18.9.0

…s/FixedWidthParser.Tests/develop/Microsoft.Testing.Extensions.CodeCoverage-18.9.0 Bump Microsoft.Testing.Extensions.CodeCoverage from 18.8.0 to 18.9.0

…lop/analyzers-88fc51832c Bump Meziantou.Analyzer and 2 others

…ions/develop/actions/setup-dotnet-6 Bump actions/setup-dotnet from 5 to 6

…quest triggers

codecov-commenter · 2026-07-17T14:33:13Z

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 94.53125% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.18%. Comparing base (d94aec9) to head (843a06f).

Files with missing lines	Patch %	Lines
...dWidthParser/Processors/Utf8ColumnParserFactory.cs	87.50%	0 Missing and 2 partials ⚠️
...c/FixedWidthParser/Readers/RecordEnumeratorCore.cs	81.81%	1 Missing and 1 partial ⚠️
...dWidthParser.Generator/FixedWidthModelGenerator.cs	83.33%	0 Missing and 1 partial ⚠️
...FixedWidthParser/Processors/ColumnParserFactory.cs	92.85%	0 Missing and 1 partial ⚠️
src/FixedWidthParser/Readers/TextReaderSource.cs	88.88%	0 Missing and 1 partial ⚠️
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
+ Coverage   86.39%   89.18%   +2.79%     
==========================================
  Files          42       37       -5     
  Lines        1962     1738     -224     
  Branches      341      322      -19     
==========================================
- Hits         1695     1550     -145     
+ Misses        192      117      -75     
+ Partials       75       71       -4

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

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❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

github-actions · 2026-07-17T14:35:23Z

Benchmark Results

Measured on ubuntu-latest (GitHub Actions). Runner noise may affect absolute numbers; use these for relative comparisons within a PR.

Benchmarks.Perf.AsyncReaderBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
GeneratedReader_ReadAsync	100	4.925 μs	0.1120 μs	0.0291 μs	0.67	0.01	0.2518	4248 B	0.23
SpanReader_ReadAsync	100	6.951 μs	0.1010 μs	0.0156 μs	0.95	0.01	0.2518	4264 B	0.23
Naive_ReadLineAsync	100	7.350 μs	0.1711 μs	0.0444 μs	1.00	0.01	1.0986	18424 B	1.00
GeneratedReader_ReadAsync_Pooled	100	9.430 μs	0.1544 μs	0.0401 μs	1.28	0.01	0.0153	328 B	0.02
SpanReader_ReadAsync_Pooled	100	11.577 μs	0.0219 μs	0.0034 μs	1.58	0.01	0.0153	344 B	0.02

GeneratedReader_ReadAsync	1000	48.244 μs	0.7751 μs	0.1200 μs	0.64	0.01	2.3193	39528 B	0.216
SpanReader_ReadAsync	1000	68.839 μs	0.8810 μs	0.2288 μs	0.92	0.01	2.3193	39544 B	0.216
Naive_ReadLineAsync	1000	74.869 μs	3.8822 μs	1.0082 μs	1.00	0.02	10.8643	183304 B	1.000
GeneratedReader_ReadAsync_Pooled	1000	90.423 μs	0.5353 μs	0.1390 μs	1.21	0.01	-	328 B	0.002
SpanReader_ReadAsync_Pooled	1000	111.901 μs	0.2665 μs	0.0412 μs	1.49	0.02	-	344 B	0.002

Benchmarks.Perf.ByteReaderBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.87GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
CharParser_Parse	100	5.358 μs	0.0565 μs	0.0087 μs	1.00	0.2289	3.83 KB	1.00
ByteParser_Parse	100	6.047 μs	0.0427 μs	0.0111 μs	1.13	0.2289	3.83 KB	1.00
CharParser_Parse_AfterUtf8Decode	100	7.283 μs	0.0544 μs	0.0084 μs	1.36	0.6638	10.86 KB	2.84

CharParser_Parse	1000	52.974 μs	0.4147 μs	0.1077 μs	1.00	2.3193	38.28 KB	1.00
ByteParser_Parse	1000	63.656 μs	0.2464 μs	0.0381 μs	1.20	2.3193	38.28 KB	1.00
CharParser_Parse_AfterUtf8Decode	1000	72.791 μs	0.4671 μs	0.0723 μs	1.37	6.5918	108.59 KB	2.84

Benchmarks.Perf.ByteReaderPoolingBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.87GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
NoString	100	4.476 μs	0.0154 μs	0.0024 μs	0.62	-	-	0.00
WithString_NoPool	100	7.220 μs	0.0182 μs	0.0028 μs	1.00	0.2289	3920 B	1.00
WithString_Pooled	100	13.996 μs	0.0294 μs	0.0076 μs	1.94	-	-	0.00

NoString	1000	44.823 μs	0.1209 μs	0.0187 μs	0.61	-	-	0.00
WithString_NoPool	1000	73.245 μs	0.4679 μs	0.1215 μs	1.00	2.3193	39200 B	1.00
WithString_Pooled	1000	133.820 μs	0.3019 μs	0.0467 μs	1.83	-	-	0.00

Benchmarks.Perf.ByteReaderStreamBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.87GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Gen1	Gen2	Allocated	Alloc Ratio
ByteReader_Read	100	7.126 μs	0.0935 μs	0.0145 μs	0.28	0.2289	-	-	3.83 KB	0.02
CharReader_Read	100	25.701 μs	0.7272 μs	0.1888 μs	1.00	41.6565	41.6565	41.6565	196.04 KB	1.00

ByteReader_Read	1000	74.371 μs	1.6889 μs	0.4386 μs	0.70	2.3193	-	-	38.28 KB	0.17
CharReader_Read	1000	105.637 μs	2.0959 μs	0.5443 μs	1.00	41.6260	41.6260	41.6260	230.5 KB	1.00

Benchmarks.Perf.ComparisonBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Gen1	Allocated	Alloc Ratio
FixedWidthParser_Generated	100	4.831 μs	0.0909 μs	0.0236 μs	0.14	0.2289	-	3.86 KB	0.09
FixedWidthParser_Read	100	6.369 μs	0.0381 μs	0.0059 μs	0.18	0.2289	-	3.86 KB	0.09
RecordParser_Read	100	10.813 μs	0.0959 μs	0.0249 μs	0.31	0.2441	-	4.23 KB	0.10
FileHelpers_Read	100	34.561 μs	0.4855 μs	0.1261 μs	1.00	2.5024	0.0610	41.49 KB	1.00
FlatFiles_Read	100	63.109 μs	1.0661 μs	0.1650 μs	1.83	6.2256	0.1221	103.13 KB	2.49

FixedWidthParser_Generated	1000	45.719 μs	0.8045 μs	0.1245 μs	0.13	2.3193	-	38.31 KB	0.09
FixedWidthParser_Read	1000	61.160 μs	1.4496 μs	0.2243 μs	0.18	2.3193	-	38.31 KB	0.09
RecordParser_Read	1000	107.627 μs	0.9099 μs	0.1408 μs	0.31	2.3193	-	38.69 KB	0.10
FileHelpers_Read	1000	344.075 μs	5.1429 μs	1.3356 μs	1.00	24.4141	5.8594	406.42 KB	1.00
FlatFiles_Read	1000	634.247 μs	9.5939 μs	2.4915 μs	1.84	57.6172	1.9531	953.2 KB	2.35

Benchmarks.Perf.ComparisonWriterBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
FixedWidthParser_Write	1	129.1 ns	0.24 ns	0.04 ns	0.72	0.00	-	-	-	0.00
FileHelpers_Write	1	178.2 ns	1.37 ns	0.21 ns	1.00	0.00	0.0215	-	360 B	1.00
FlatFiles_Write	1	428.5 ns	4.64 ns	1.20 ns	2.41	0.01	0.0424	-	712 B	1.98
RecordParser_Write	1	19,396.5 ns	754.90 ns	196.05 ns	108.86	1.02	1.0986	0.0305	18128 B	50.36

FixedWidthParser_Write	100	13,153.2 ns	28.01 ns	4.33 ns	0.74	0.00	-	-	-	0.00
FileHelpers_Write	100	17,676.5 ns	233.41 ns	60.62 ns	1.00	0.00	1.9531	-	32832 B	1.00
FlatFiles_Write	100	42,509.2 ns	579.79 ns	89.72 ns	2.40	0.01	4.2114	-	71200 B	2.17
RecordParser_Write	100	50,532.5 ns	5,856.37 ns	906.28 ns	2.86	0.05	1.2207	0.0610	20440 B	0.62

FixedWidthParser_Write	1000	132,088.4 ns	347.35 ns	53.75 ns	0.74	0.00	-	-	-	0.00
FileHelpers_Write	1000	178,468.8 ns	1,874.73 ns	290.12 ns	1.00	0.00	19.5313	-	328032 B	1.00
FlatFiles_Write	1000	420,658.2 ns	3,428.56 ns	530.57 ns	2.36	0.00	42.4805	-	712000 B	2.17
RecordParser_Write	1000	464,402.7 ns	156,741.98 ns	40,705.40 ns	2.60	0.21	82.0313	80.0781	1383639 B	4.22

Benchmarks.Perf.ParserBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Line	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
Parse_NoPool	Jane (...)0.00 [25]	47.66 ns	2.800 ns	0.727 ns	1.00	0.02	0.0029	48 B	1.00
Parse_WithStringPool	Jane (...)0.00 [25]	78.07 ns	0.374 ns	0.097 ns	1.64	0.02	-	-	0.00

Parse_NoPool	John (...)0.00 [25]	55.03 ns	0.319 ns	0.049 ns	1.00	0.00	0.0024	40 B	1.00
Parse_WithStringPool	John (...)0.00 [25]	84.23 ns	0.211 ns	0.055 ns	1.53	0.00	-	-	0.00

Benchmarks.Perf.PipeReaderBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.87GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
Stream_ReadAsync	100	8.337 μs	0.0717 μs	0.0111 μs	1.00	0.2441	4.09 KB	1.00
Pipe_ReadAsync	100	16.837 μs	0.3075 μs	0.0476 μs	2.02	0.2441	4.48 KB	1.10
Pipe_ReadAsync_SmallSegments	100	55.647 μs	0.4663 μs	0.0722 μs	6.68	0.2441	4.67 KB	1.14

Stream_ReadAsync	1000	75.907 μs	0.1290 μs	0.0200 μs	1.00	2.3193	38.54 KB	1.00
Pipe_ReadAsync	1000	165.580 μs	1.1643 μs	0.1802 μs	2.18	2.1973	39.03 KB	1.01
Pipe_ReadAsync_SmallSegments	1000	537.333 μs	4.1154 μs	0.6369 μs	7.08	1.9531	39.13 KB	1.02

Benchmarks.Perf.ReaderBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
GeneratedReader_Read	100	4.696 μs	0.0558 μs	0.0145 μs	0.71	0.2289	3952 B	0.354
SpanReader_Read	100	6.005 μs	0.0244 μs	0.0038 μs	0.90	0.2289	3952 B	0.354
Naive_ReadLine	100	6.656 μs	0.0857 μs	0.0222 μs	1.00	0.6638	11152 B	1.000
GeneratedReader_Read_Pooled	100	8.646 μs	0.1072 μs	0.0166 μs	1.30	-	32 B	0.003
SpanReader_Read_Pooled	100	10.157 μs	0.1613 μs	0.0419 μs	1.53	-	32 B	0.003

GeneratedReader_Read	1000	46.337 μs	0.2103 μs	0.0325 μs	0.69	2.3193	39232 B	0.353
SpanReader_Read	1000	60.997 μs	0.4468 μs	0.0691 μs	0.91	2.3193	39232 B	0.353
Naive_ReadLine	1000	66.860 μs	0.4151 μs	0.1078 μs	1.00	6.5918	111232 B	1.000
GeneratedReader_Read_Pooled	1000	85.553 μs	0.4290 μs	0.0664 μs	1.28	-	32 B	0.000
SpanReader_Read_Pooled	1000	103.260 μs	0.5893 μs	0.1530 μs	1.54	-	32 B	0.000

Benchmarks.Perf.ReaderStartupBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
GeneratedReader_ReadOne	113.0 ns	0.63 ns	0.10 ns	0.93	0.0043	72 B	0.75
ReflectionReader_ConstructAndReadOne	121.1 ns	2.24 ns	0.58 ns	1.00	0.0057	96 B	1.00

Benchmarks.Perf.SourceGenParserBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Line	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
Generated	John (...)00.00 [25]	38.58 ns	0.599 ns	0.093 ns	0.69	0.0024	40 B	1.00
Reflection	John (...)00.00 [25]	55.60 ns	0.639 ns	0.099 ns	1.00	0.0024	40 B	1.00

Benchmarks.Perf.WriterBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.302
  [Host]     : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v4
  Job-MEHJPP : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v4

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Gen1	Allocated	Alloc Ratio
WriteMany_ReuseWriterSpan	1	99.62 ns	0.905 ns	0.235 ns	0.55	-	-	-	0.00
WriteMany_ReuseWriter	1	101.90 ns	2.089 ns	0.543 ns	0.56	-	-	-	0.00
WriteMany_AsyncReuseWriter	1	130.61 ns	0.957 ns	0.148 ns	0.72	0.0019	-	32 B	0.01
WriteMany_NewStream	1	181.29 ns	5.084 ns	1.320 ns	1.00	0.1328	-	2224 B	1.00
WriteMany_AsyncNewStream	1	329.96 ns	1.406 ns	0.365 ns	1.82	0.3204	0.0029	5360 B	2.41

WriteMany_ReuseWriterSpan	100	10,186.65 ns	59.792 ns	9.253 ns	0.96	-	-	-	0.000
WriteMany_NewStream	100	10,625.77 ns	176.654 ns	27.337 ns	1.00	0.3052	-	5328 B	1.000
WriteMany_ReuseWriter	100	10,638.60 ns	82.984 ns	21.551 ns	1.00	-	-	-	0.000
WriteMany_AsyncReuseWriter	100	11,235.58 ns	79.567 ns	20.663 ns	1.06	-	-	32 B	0.006
WriteMany_AsyncNewStream	100	11,695.29 ns	96.542 ns	14.940 ns	1.10	0.3204	-	5360 B	1.006

WriteMany_ReuseWriter	1000	102,750.03 ns	219.303 ns	56.952 ns	0.97	-	-	-	0.000
WriteMany_NewStream	1000	105,497.02 ns	918.750 ns	142.178 ns	1.00	0.2441	-	5328 B	1.000
WriteMany_ReuseWriterSpan	1000	105,517.37 ns	418.258 ns	108.620 ns	1.00	-	-	-	0.000
WriteMany_AsyncReuseWriter	1000	114,401.69 ns	627.542 ns	162.971 ns	1.08	-	-	32 B	0.006
WriteMany_AsyncNewStream	1000	114,484.71 ns	980.802 ns	151.780 ns	1.09	0.2441	-	5360 B	1.006

…sing

dependabot Bot and others added 19 commits July 16, 2026 14:54

Bump csFastFloat from 4.1.5 to 4.1.6

0e05f31

--- updated-dependencies: - dependency-name: csFastFloat dependency-version: 4.1.6 dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com>

Simplify Phase 1 reader and project plumbing

88fa835

Merge pull request #44 from GabrielMarquezMatte/dependabot/nuget/src/…

8e21246

…FixedWidthParser/develop/System.IO.Pipelines-10.0.10 Bump System.IO.Pipelines from 10.0.9 to 10.0.10

Merge pull request #43 from GabrielMarquezMatte/dependabot/nuget/test…

a601117

…s/FixedWidthParser.Generator.Tests/develop/multi-747a3f1faf Bump Microsoft.Testing.Extensions.TrxReport from 2.2.3 to 2.3.2

Merge branch 'develop' into dependabot/nuget/src/FixedWidthParser/dev…

763e066

…elop/csFastFloat-4.1.6

Merge pull request #41 from GabrielMarquezMatte/dependabot/nuget/src/…

507541d

…FixedWidthParser/develop/csFastFloat-4.1.6 Bump csFastFloat from 4.1.5 to 4.1.6

Merge branch 'develop' into dependabot/nuget/tests/FixedWidthParser.T…

1fe8d66

…ests/develop/Microsoft.Testing.Extensions.CodeCoverage-18.9.0

Merge pull request #42 from GabrielMarquezMatte/dependabot/nuget/test…

b5370a1

…s/FixedWidthParser.Tests/develop/Microsoft.Testing.Extensions.CodeCoverage-18.9.0 Bump Microsoft.Testing.Extensions.CodeCoverage from 18.8.0 to 18.9.0

Merge pull request #40 from GabrielMarquezMatte/dependabot/nuget/deve…

64b73b0

…lop/analyzers-88fc51832c Bump Meziantou.Analyzer and 2 others

Merge pull request #39 from GabrielMarquezMatte/dependabot/github_act…

cdc717d

…ions/develop/actions/setup-dotnet-6 Bump actions/setup-dotnet from 5 to 6

Update CI and CodeQL workflows to include 'develop' branch in pull re…

8006287

…quest triggers

Merge branch 'master' into develop

e810d57

Add new models and coverage tests for TimeOnly and DateTimeOffset par…

843a06f

…sing

GabrielMarquezMatte merged commit a889d62 into master Jul 17, 2026
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Update dependencies and refactor Fixed Width Parser for performance - #46

Update dependencies and refactor Fixed Width Parser for performance#46
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Benchmark Results

Benchmarks.Perf.AsyncReaderBenchmarks

Benchmarks.Perf.ByteReaderBenchmarks

Benchmarks.Perf.ByteReaderPoolingBenchmarks

Benchmarks.Perf.ByteReaderStreamBenchmarks

Benchmarks.Perf.ComparisonBenchmarks

Benchmarks.Perf.ComparisonWriterBenchmarks

Benchmarks.Perf.ParserBenchmarks

Benchmarks.Perf.PipeReaderBenchmarks

Benchmarks.Perf.ReaderBenchmarks

Benchmarks.Perf.ReaderStartupBenchmarks

Benchmarks.Perf.SourceGenParserBenchmarks

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