Bump Meziantou.Analyzer to version 3.0.105 and refactor parsing methods by GabrielMarquezMatte · Pull Request #27 · GabrielMarquezMatte/FixedWidthParser

GabrielMarquezMatte · 2026-06-19T23:12:45Z

This pull request refactors how fallback parsers are created in both the ColumnParserFactory and Utf8ColumnParserFactory by replacing the allocation of delegate-based value parsers with direct calls to static-abstract TryParse methods. This change reduces indirection and improves performance by allowing the JIT to inline these calls and avoid unnecessary delegate allocations. The shared factory logic is updated accordingly, and some minor cleanup is performed.

Parser construction and performance improvements:

Replaced the creation of delegate-based fallback value parsers with new BuildParsable methods in both ColumnParserFactory and Utf8ColumnParserFactory. These methods generate column parsers that call the static-abstract TryParse directly, reducing one level of indirection and avoiding delegate allocation. [1] [2] [3] [4]
Updated the shared ColumnParserFactoryShared.Create method to use the new BuildParsable approach for fallback parsing, only using the registry and generic builder for registered (custom) parsers. [1] [2]

Dependency and cleanup:

Bumped Meziantou.Analyzer NuGet package version from 3.0.104 to 3.0.105.
Removed unused System.Diagnostics.CodeAnalysis using directives from parser factory files. [1] [2]

Bumps Meziantou.Analyzer from 3.0.104 to 3.0.105 --- updated-dependencies: - dependency-name: Meziantou.Analyzer dependency-version: 3.0.105 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: analyzers ... Signed-off-by: dependabot[bot] <support@github.com>

…alue parsing methods

…lop/analyzers-d09dba7c20 Bump the analyzers group with 1 update

codecov-commenter · 2026-06-19T23:13:47Z

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@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   97.39%   97.43%   +0.03%     
==========================================
  Files          43       43              
  Lines        1307     1323      +16     
  Branches      199      199              
==========================================
+ Hits         1273     1289      +16     
  Misses          9        9              
  Partials       25       25

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github-actions · 2026-06-19T23:16:52Z

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 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
GeneratedReader_ReadAsync	100	5.599 μs	0.0485 μs	0.0075 μs	0.75	0.01	0.2518	4216 B	0.23
Naive_ReadLineAsync	100	7.436 μs	0.4417 μs	0.0684 μs	1.00	0.01	1.0986	18424 B	1.00
SpanReader_ReadAsync	100	7.671 μs	0.1315 μs	0.0203 μs	1.03	0.01	0.2441	4232 B	0.23
GeneratedReader_ReadAsync_Pooled	100	9.895 μs	0.1114 μs	0.0172 μs	1.33	0.01	0.0153	296 B	0.02
SpanReader_ReadAsync_Pooled	100	12.461 μs	0.5108 μs	0.1326 μs	1.68	0.02	0.0153	312 B	0.02

GeneratedReader_ReadAsync	1000	55.210 μs	0.7774 μs	0.1203 μs	0.73	0.00	2.3193	39496 B	0.215
Naive_ReadLineAsync	1000	75.565 μs	1.9340 μs	0.5022 μs	1.00	0.01	10.8643	183304 B	1.000
SpanReader_ReadAsync	1000	77.347 μs	0.6452 μs	0.1676 μs	1.02	0.01	2.3193	39512 B	0.216
GeneratedReader_ReadAsync_Pooled	1000	93.847 μs	0.9427 μs	0.2448 μs	1.24	0.01	-	296 B	0.002
SpanReader_ReadAsync_Pooled	1000	121.343 μs	0.9118 μs	0.2368 μs	1.61	0.01	-	312 B	0.002

Benchmarks.Perf.ByteReaderBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.85GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
CharParser_Parse	100	4.736 μs	0.0941 μs	0.0146 μs	1.00	0.00	0.2289	3.83 KB	1.00
ByteParser_Parse	100	5.151 μs	0.0671 μs	0.0174 μs	1.09	0.00	0.2289	3.83 KB	1.00
CharParser_Parse_AfterUtf8Decode	100	6.798 μs	0.0979 μs	0.0152 μs	1.44	0.00	0.6638	10.86 KB	2.84

CharParser_Parse	1000	49.171 μs	2.0543 μs	0.5335 μs	1.00	0.01	2.3193	38.28 KB	1.00
ByteParser_Parse	1000	60.141 μs	0.6275 μs	0.0971 μs	1.22	0.01	2.3193	38.28 KB	1.00
CharParser_Parse_AfterUtf8Decode	1000	92.787 μs	1.7453 μs	0.2701 μs	1.89	0.02	6.5918	108.59 KB	2.84

Benchmarks.Perf.ByteReaderPoolingBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.85GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
NoString	100	3.489 μs	0.0500 μs	0.0130 μs	0.54	-	-	0.00
WithString_NoPool	100	6.467 μs	0.0700 μs	0.0182 μs	1.00	0.2289	3920 B	1.00
WithString_Pooled	100	13.850 μs	0.0826 μs	0.0214 μs	2.14	-	-	0.00

NoString	1000	33.281 μs	0.1034 μs	0.0160 μs	0.57	-	-	0.00
WithString_NoPool	1000	58.902 μs	0.5405 μs	0.0836 μs	1.00	2.3193	39200 B	1.00
WithString_Pooled	1000	139.080 μs	1.1654 μs	0.1803 μs	2.36	-	-	0.00

Benchmarks.Perf.ByteReaderStreamBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.85GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Gen1	Allocated	Alloc Ratio
ByteReader_Read	100	5.879 μs	0.1222 μs	0.0317 μs	0.92	0.2289	-	3.83 KB	0.24
CharReader_Read	100	6.369 μs	0.1312 μs	0.0203 μs	1.00	0.9766	0.0458	16.03 KB	1.00

CharReader_Read	1000	60.855 μs	0.5547 μs	0.1440 μs	1.00	3.0518	0.1221	50.48 KB	1.00
ByteReader_Read	1000	61.274 μs	0.2771 μs	0.0429 μs	1.01	2.3193	-	38.28 KB	0.76

Benchmarks.Perf.ParserBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v4
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v4

IterationCount=5  WarmupCount=1

Method	Line	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
Parse_NoPool	Jane (...)0.00 [25]	47.65 ns	3.011 ns	0.782 ns	1.00	0.02	0.0019	48 B	1.00
Parse_WithStringPool	Jane (...)0.00 [25]	75.14 ns	1.145 ns	0.297 ns	1.58	0.02	-	-	0.00

Parse_NoPool	John (...)0.00 [25]	46.79 ns	0.660 ns	0.102 ns	1.00	0.00	0.0015	40 B	1.00
Parse_WithStringPool	John (...)0.00 [25]	71.46 ns	0.221 ns	0.034 ns	1.53	0.00	-	-	0.00

Benchmarks.Perf.PipeReaderBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.85GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
Stream_ReadAsync	100	8.251 μs	0.1733 μs	0.0450 μs	1.00	0.01	0.2441	4.08 KB	1.00
Pipe_ReadAsync	100	18.547 μs	0.1655 μs	0.0256 μs	2.25	0.01	0.2441	4.41 KB	1.08
Pipe_ReadAsync_SmallSegments	100	59.696 μs	1.0734 μs	0.2788 μs	7.24	0.05	0.2441	4.6 KB	1.13

Stream_ReadAsync	1000	79.706 μs	0.2700 μs	0.0418 μs	1.00	0.00	2.3193	38.53 KB	1.00
Pipe_ReadAsync	1000	207.447 μs	1.2322 μs	0.1907 μs	2.60	0.00	2.1973	38.96 KB	1.01
Pipe_ReadAsync_SmallSegments	1000	620.726 μs	6.7136 μs	1.7435 μs	7.79	0.02	1.9531	39.05 KB	1.01

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 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
GeneratedReader_Read	100	4.339 μs	0.0519 μs	0.0080 μs	0.66	0.2289	3952 B	0.354
SpanReader_Read	100	6.150 μs	0.0451 μs	0.0117 μs	0.93	0.2289	3952 B	0.354
Naive_ReadLine	100	6.603 μs	0.0882 μs	0.0229 μs	1.00	0.6638	11152 B	1.000
GeneratedReader_Read_Pooled	100	8.371 μs	0.0930 μs	0.0241 μs	1.27	-	32 B	0.003
SpanReader_Read_Pooled	100	10.010 μs	0.1645 μs	0.0427 μs	1.52	-	32 B	0.003

GeneratedReader_Read	1000	43.631 μs	0.5874 μs	0.0909 μs	0.64	2.3193	39232 B	0.353
SpanReader_Read	1000	59.288 μs	0.4942 μs	0.1283 μs	0.87	2.3193	39232 B	0.353
Naive_ReadLine	1000	67.801 μs	0.9088 μs	0.2360 μs	1.00	6.5918	111232 B	1.000
GeneratedReader_Read_Pooled	1000	83.979 μs	0.4413 μs	0.0683 μs	1.24	-	32 B	0.000
SpanReader_Read_Pooled	1000	99.890 μs	3.1898 μs	0.8284 μs	1.47	-	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 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
GeneratedReader_ReadOne	92.40 ns	1.476 ns	0.383 ns	0.82	0.02	0.0043	72 B	0.75
ReflectionReader_ConstructAndReadOne	112.92 ns	9.389 ns	2.438 ns	1.00	0.03	0.0057	96 B	1.00

Benchmarks.Perf.SourceGenParserBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v4
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v4

IterationCount=5  WarmupCount=1

Method	Line	Mean	Error	StdDev	Ratio	Gen0	Allocated	Alloc Ratio
Reflection	John (...)00.00 [25]	45.79 ns	1.696 ns	0.440 ns	1.00	0.0015	40 B	1.00
Generated	John (...)00.00 [25]	48.44 ns	0.315 ns	0.049 ns	1.06	0.0015	40 B	1.00

Benchmarks.Perf.WriterBenchmarks


BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-MEHJPP : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

IterationCount=5  WarmupCount=1

Method	Count	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
WriteMany_ReuseWriter	1	116.6 ns	0.58 ns	0.09 ns	0.43	0.01	-	-	-	0.00
WriteMany_ReuseWriterSpan	1	118.9 ns	0.66 ns	0.10 ns	0.44	0.02	-	-	-	0.00
WriteMany_AsyncReuseWriter	1	200.4 ns	1.87 ns	0.49 ns	0.74	0.03	0.0019	-	32 B	0.01
WriteMany_NewStream	1	270.1 ns	38.65 ns	10.04 ns	1.00	0.05	0.1326	-	2224 B	1.00
WriteMany_AsyncNewStream	1	534.6 ns	90.69 ns	23.55 ns	1.98	0.10	0.3204	0.0029	5360 B	2.41

WriteMany_ReuseWriterSpan	100	12,452.5 ns	19.31 ns	5.01 ns	0.94	0.00	-	-	-	0.000
WriteMany_ReuseWriter	100	12,881.1 ns	1,166.83 ns	303.02 ns	0.98	0.02	-	-	-	0.000
WriteMany_NewStream	100	13,191.6 ns	318.52 ns	49.29 ns	1.00	0.00	0.3052	-	5328 B	1.000
WriteMany_AsyncReuseWriter	100	13,792.6 ns	144.99 ns	37.65 ns	1.05	0.00	-	-	32 B	0.006
WriteMany_AsyncNewStream	100	16,119.6 ns	154.29 ns	40.07 ns	1.22	0.00	0.3052	-	5360 B	1.006

WriteMany_ReuseWriter	1000	123,415.6 ns	578.69 ns	89.55 ns	0.98	0.00	-	-	-	0.000
WriteMany_ReuseWriterSpan	1000	123,907.8 ns	278.50 ns	43.10 ns	0.98	0.00	-	-	-	0.000
WriteMany_NewStream	1000	126,140.1 ns	856.89 ns	222.53 ns	1.00	0.00	0.2441	-	5328 B	1.000
WriteMany_AsyncNewStream	1000	141,866.3 ns	1,971.26 ns	511.93 ns	1.12	0.00	0.2441	-	5360 B	1.006
WriteMany_AsyncReuseWriter	1000	144,062.8 ns	1,168.94 ns	303.57 ns	1.14	0.00	-	-	32 B	0.006

dependabot Bot and others added 3 commits June 19, 2026 18:11

Refactor ColumnParserFactory and Utf8ColumnParserFactory to improve v…

bd83076

…alue parsing methods

Merge pull request #26 from GabrielMarquezMatte/dependabot/nuget/deve…

41f5390

…lop/analyzers-d09dba7c20 Bump the analyzers group with 1 update

GabrielMarquezMatte merged commit 334627a into master Jun 19, 2026
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Bump Meziantou.Analyzer to version 3.0.105 and refactor parsing methods#27

Bump Meziantou.Analyzer to version 3.0.105 and refactor parsing methods#27
GabrielMarquezMatte merged 3 commits into
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GabrielMarquezMatte commented Jun 19, 2026

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GabrielMarquezMatte commented Jun 19, 2026

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Benchmark Results

Benchmarks.Perf.AsyncReaderBenchmarks

Benchmarks.Perf.ByteReaderBenchmarks

Benchmarks.Perf.ByteReaderPoolingBenchmarks

Benchmarks.Perf.ByteReaderStreamBenchmarks

Benchmarks.Perf.ParserBenchmarks

Benchmarks.Perf.PipeReaderBenchmarks

Benchmarks.Perf.ReaderBenchmarks

Benchmarks.Perf.ReaderStartupBenchmarks

Benchmarks.Perf.SourceGenParserBenchmarks

Benchmarks.Perf.WriterBenchmarks

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