Use generic math for floating point formatting #102683

huoyaoyuan · 2024-05-25T05:06:47Z

Extracted from #98643

dotnet-policy-service · 2024-05-25T05:07:22Z

Tagging subscribers to this area: @dotnet/area-system-numerics
See info in area-owners.md if you want to be subscribed.

src/libraries/System.Private.CoreLib/src/System/Number.Formatting.cs

tannergooding · 2024-05-29T16:02:54Z

Can you do some performance testing on Mono? The general process for doing so is documented here: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

CC. @SamMonoRT

SamMonoRT · 2024-05-29T17:57:06Z

adding @steveisok and @vitek-karas for Mono scenario followup.

steveisok · 2024-05-29T22:14:23Z

Can you do some performance testing on Mono? The general process for doing so is documented here: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

@fanyang-mono can you please help with this?

huoyaoyuan · 2024-05-30T11:37:17Z

@EgorBot -arm64 -intel -mono

using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace BenchmarkGround
{
    public class Program
    {
        public IEnumerable<object> Values => [0.0, 1.0, 1234.5678, 1.09876543211234567890e30];

        public IEnumerable<object> Formats => ["G", "F0", "F10", "E"];

        public IEnumerable<object[]> ValueAndFormats => Values.SelectMany(v => Formats.Select(f => new object[] { v, f }));

        [Benchmark]
        [ArgumentsSource(nameof(Values))]
        public string DefaultToString(double value) => value.ToString();

        [Benchmark]
        [ArgumentsSource(nameof(ValueAndFormats))]
        public string ToStringFormat(double value, string format) => value.ToString(format);
    }
}

EgorBot · 2024-05-30T12:03:07Z

Benchmark results on Intel

BenchmarkDotNet v0.13.12, Ubuntu 22.04.4 LTS (Jammy Jellyfish)
Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 16 logical and 8 physical cores
  Job-UEIGGG : .NET 9.0.0 (42.42.42.42424) using MonoVM, X64 X86Base
  Job-ALWOTV : .NET 9.0.0 (42.42.42.42424) using MonoVM, X64 X86Base

Method	Toolchain	value	format	Mean	Error	Ratio
ToStringFormat	Main	0	E	226.90 ns	0.921 ns	1.00
ToStringFormat	PR	0	E	225.29 ns	0.690 ns	0.99

ToStringFormat	Main	0	F0	128.09 ns	0.156 ns	1.00
ToStringFormat	PR	0	F0	124.79 ns	0.195 ns	0.97

ToStringFormat	Main	0	F10	177.88 ns	0.332 ns	1.00
ToStringFormat	PR	0	F10	185.54 ns	0.418 ns	1.04

ToStringFormat	Main	0	G	108.44 ns	0.102 ns	1.00
ToStringFormat	PR	0	G	104.68 ns	0.126 ns	0.97

DefaultToString	Main	0	?	98.84 ns	0.434 ns	1.00
DefaultToString	PR	0	?	99.34 ns	0.121 ns	1.01

ToStringFormat	Main	1	E	650.64 ns	0.610 ns	1.00
ToStringFormat	PR	1	E	637.64 ns	0.816 ns	0.98

ToStringFormat	Main	1	F0	446.54 ns	0.388 ns	1.00
ToStringFormat	PR	1	F0	444.08 ns	0.256 ns	0.99

ToStringFormat	Main	1	F10	507.16 ns	0.898 ns	1.00
ToStringFormat	PR	1	F10	534.59 ns	1.173 ns	1.05

ToStringFormat	Main	1	G	285.54 ns	0.299 ns	1.00
ToStringFormat	PR	1	G	296.65 ns	0.443 ns	1.04

DefaultToString	Main	1	?	287.81 ns	0.387 ns	1.00
DefaultToString	PR	1	?	287.23 ns	0.211 ns	1.00

ToStringFormat	Main	1234.5678	E	413.64 ns	1.110 ns	1.00
ToStringFormat	PR	1234.5678	E	405.81 ns	0.469 ns	0.98

ToStringFormat	Main	1234.5678	F0	612.96 ns	0.747 ns	1.00
ToStringFormat	PR	1234.5678	F0	604.78 ns	0.446 ns	0.99

ToStringFormat	Main	1234.5678	F10	886.58 ns	0.385 ns	1.00
ToStringFormat	PR	1234.5678	F10	915.23 ns	0.973 ns	1.03

ToStringFormat	Main	1234.5678	G	395.59 ns	0.486 ns	1.00
ToStringFormat	PR	1234.5678	G	414.06 ns	0.583 ns	1.05

DefaultToString	Main	1234.5678	?	393.30 ns	0.892 ns	1.00
DefaultToString	PR	1234.5678	?	421.81 ns	0.678 ns	1.07

ToStringFormat	Main	1.098(...)6E+30 [22]	E	379.21 ns	1.033 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	E	374.62 ns	0.361 ns	0.99

ToStringFormat	Main	1.098(...)6E+30 [22]	F0	2,005.17 ns	0.582 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	F0	2,051.34 ns	1.010 ns	1.02

ToStringFormat	Main	1.098(...)6E+30 [22]	F10	2,215.33 ns	1.449 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	F10	2,177.53 ns	0.712 ns	0.98

ToStringFormat	Main	1.098(...)6E+30 [22]	G	525.76 ns	0.795 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	G	527.60 ns	0.502 ns	1.00

DefaultToString	Main	1.098(...)6E+30 [22]	?	540.69 ns	0.365 ns	1.00
DefaultToString	PR	1.098(...)6E+30 [22]	?	545.84 ns	1.387 ns	1.01

BDN_Artifacts.zip

EgorBot · 2024-05-30T12:09:31Z

Benchmark results on Arm64

BenchmarkDotNet v0.13.12, Ubuntu 22.04.4 LTS (Jammy Jellyfish)
Unknown processor
  Job-MOGBOV : .NET 9.0.0 (42.42.42.42424) using MonoVM, Arm64 ArmBase
  Job-TLGOAU : .NET 9.0.0 (42.42.42.42424) using MonoVM, Arm64 ArmBase

Method	Toolchain	value	format	Mean	Error	Ratio
ToStringFormat	Main	0	E	411.9 ns	0.84 ns	1.00
ToStringFormat	PR	0	E	407.3 ns	0.71 ns	0.99

ToStringFormat	Main	0	F0	239.0 ns	0.19 ns	1.00
ToStringFormat	PR	0	F0	236.3 ns	0.20 ns	0.99

ToStringFormat	Main	0	F10	360.0 ns	0.30 ns	1.00
ToStringFormat	PR	0	F10	373.4 ns	0.29 ns	1.04

ToStringFormat	Main	0	G	196.7 ns	0.24 ns	1.00
ToStringFormat	PR	0	G	191.8 ns	0.27 ns	0.97

DefaultToString	Main	0	?	179.5 ns	0.71 ns	1.00
DefaultToString	PR	0	?	180.7 ns	0.21 ns	1.01

ToStringFormat	Main	1	E	1,100.3 ns	1.91 ns	1.00
ToStringFormat	PR	1	E	1,096.5 ns	2.15 ns	1.00

ToStringFormat	Main	1	F0	789.5 ns	2.75 ns	1.00
ToStringFormat	PR	1	F0	787.5 ns	1.53 ns	1.00

ToStringFormat	Main	1	F10	897.8 ns	1.34 ns	1.00
ToStringFormat	PR	1	F10	915.2 ns	1.33 ns	1.02

ToStringFormat	Main	1	G	502.9 ns	0.48 ns	1.00
ToStringFormat	PR	1	G	528.1 ns	0.46 ns	1.05

DefaultToString	Main	1	?	487.4 ns	0.53 ns	1.00
DefaultToString	PR	1	?	496.6 ns	0.43 ns	1.02

ToStringFormat	Main	1234.5678	E	658.4 ns	2.42 ns	1.00
ToStringFormat	PR	1234.5678	E	687.5 ns	0.91 ns	1.04

ToStringFormat	Main	1234.5678	F0	1,027.5 ns	3.39 ns	1.00
ToStringFormat	PR	1234.5678	F0	1,042.5 ns	3.28 ns	1.01

ToStringFormat	Main	1234.5678	F10	1,454.8 ns	1.09 ns	1.00
ToStringFormat	PR	1234.5678	F10	1,474.2 ns	2.98 ns	1.01

ToStringFormat	Main	1234.5678	G	655.8 ns	0.60 ns	1.00
ToStringFormat	PR	1234.5678	G	702.7 ns	1.65 ns	1.07

DefaultToString	Main	1234.5678	?	661.3 ns	0.90 ns	1.00
DefaultToString	PR	1234.5678	?	665.1 ns	1.21 ns	1.01

ToStringFormat	Main	1.098(...)6E+30 [22]	E	634.6 ns	0.54 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	E	648.8 ns	0.95 ns	1.02

ToStringFormat	Main	1.098(...)6E+30 [22]	F0	3,159.8 ns	1.75 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	F0	3,170.7 ns	2.16 ns	1.00

ToStringFormat	Main	1.098(...)6E+30 [22]	F10	3,478.2 ns	2.68 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	F10	3,481.7 ns	2.03 ns	1.00

ToStringFormat	Main	1.098(...)6E+30 [22]	G	849.2 ns	2.74 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	G	888.5 ns	1.70 ns	1.05

DefaultToString	Main	1.098(...)6E+30 [22]	?	849.9 ns	1.25 ns	1.00
DefaultToString	PR	1.098(...)6E+30 [22]	?	870.9 ns	0.92 ns	1.02

BDN_Artifacts.zip

EgorBo · 2024-05-30T12:24:00Z

@EgorBot -intel -mono --envvars MONO_ENV_OPTIONS:"--interpreter"

using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace BenchmarkGround
{
    public class Program
    {
        public IEnumerable<object> Values => [0.0, 1.0, 1234.5678, 1.09876543211234567890e30];

        public IEnumerable<object> Formats => ["G", "F0", "F10", "E"];

        public IEnumerable<object[]> ValueAndFormats => Values.SelectMany(v => Formats.Select(f => new object[] { v, f }));

        [Benchmark]
        [ArgumentsSource(nameof(Values))]
        public string DefaultToString(double value) => value.ToString();

        [Benchmark]
        [ArgumentsSource(nameof(ValueAndFormats))]
        public string ToStringFormat(double value, string format) => value.ToString(format);
    }
}

EgorBot · 2024-05-30T12:52:09Z

Benchmark results on Intel

BenchmarkDotNet v0.13.12, Ubuntu 22.04.4 LTS (Jammy Jellyfish)
Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 16 logical and 8 physical cores
  Job-DKBEJC : .NET 9.0.0 (42.42.42.42424) using MonoVM, X64 AOT
  Job-XMTINK : .NET 9.0.0 (42.42.42.42424) using MonoVM, X64 AOT
EnvironmentVariables=MONO_ENV_OPTIONS=--interpreter

Method	Toolchain	value	format	Mean	Error	Ratio
ToStringFormat	Main	0	E	814.4 ns	5.47 ns	1.00
ToStringFormat	PR	0	E	824.9 ns	4.90 ns	1.01

ToStringFormat	Main	0	F0	471.6 ns	0.49 ns	1.00
ToStringFormat	PR	0	F0	478.8 ns	0.42 ns	1.02

ToStringFormat	Main	0	F10	700.3 ns	1.23 ns	1.00
ToStringFormat	PR	0	F10	728.0 ns	1.31 ns	1.04

ToStringFormat	Main	0	G	444.2 ns	0.98 ns	1.00
ToStringFormat	PR	0	G	465.2 ns	0.78 ns	1.05

DefaultToString	Main	0	?	432.1 ns	0.44 ns	1.00
DefaultToString	PR	0	?	432.9 ns	0.44 ns	1.00

ToStringFormat	Main	1	E	1,677.3 ns	9.97 ns	1.00
ToStringFormat	PR	1	E	1,624.5 ns	5.47 ns	0.97

ToStringFormat	Main	1	F0	980.4 ns	1.71 ns	1.00
ToStringFormat	PR	1	F0	980.7 ns	0.32 ns	1.00

ToStringFormat	Main	1	F10	1,230.3 ns	1.37 ns	1.00
ToStringFormat	PR	1	F10	1,206.7 ns	2.92 ns	0.98

ToStringFormat	Main	1	G	1,090.4 ns	1.39 ns	1.00
ToStringFormat	PR	1	G	1,107.4 ns	0.36 ns	1.02

DefaultToString	Main	1	?	1,061.6 ns	1.55 ns	1.00
DefaultToString	PR	1	?	1,076.2 ns	0.69 ns	1.01

ToStringFormat	Main	1234.5678	E	1,490.5 ns	2.60 ns	1.00
ToStringFormat	PR	1234.5678	E	1,518.8 ns	6.51 ns	1.02

ToStringFormat	Main	1234.5678	F0	1,870.1 ns	2.70 ns	1.00
ToStringFormat	PR	1234.5678	F0	1,818.1 ns	1.35 ns	0.97

ToStringFormat	Main	1234.5678	F10	3,643.4 ns	7.74 ns	1.00
ToStringFormat	PR	1234.5678	F10	3,718.5 ns	7.97 ns	1.02

ToStringFormat	Main	1234.5678	G	1,561.4 ns	2.22 ns	1.00
ToStringFormat	PR	1234.5678	G	1,566.1 ns	2.62 ns	1.00

DefaultToString	Main	1234.5678	?	1,563.0 ns	6.31 ns	1.00
DefaultToString	PR	1234.5678	?	1,557.3 ns	3.53 ns	1.00

ToStringFormat	Main	1.098(...)6E+30 [22]	E	1,471.1 ns	4.17 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	E	1,466.4 ns	6.96 ns	1.00

ToStringFormat	Main	1.098(...)6E+30 [22]	F0	11,301.9 ns	5.31 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	F0	11,344.2 ns	7.14 ns	1.00

ToStringFormat	Main	1.098(...)6E+30 [22]	F10	13,623.8 ns	9.97 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	F10	13,813.5 ns	8.96 ns	1.01

ToStringFormat	Main	1.098(...)6E+30 [22]	G	2,260.0 ns	2.17 ns	1.00
ToStringFormat	PR	1.098(...)6E+30 [22]	G	2,229.2 ns	2.34 ns	0.99

DefaultToString	Main	1.098(...)6E+30 [22]	?	2,212.1 ns	2.66 ns	1.00
DefaultToString	PR	1.098(...)6E+30 [22]	?	2,191.9 ns	4.82 ns	0.99

BDN_Artifacts.zip

EgorBo · 2024-05-30T12:53:43Z

Yeah looks like Mono-JIT and Mono interp are fine with the changes in this PR, at least for the provided benchmark. Unfortunately the bot doesn't yet support LLVM-AOT to check that as well.

fanyang-mono · 2024-05-30T17:32:46Z

There are instructions here to run microbenchmarks with Mono AOT. (https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md#run-the-benchmarks-with-aot)

Please test it before merge. Usually, AOT takes the most hit from library changes.

huoyaoyuan · 2024-06-01T13:48:00Z

The instruction I used for benchmark:

dotnet run -c Release -f net8.0 --affinity 65535  --runtimes monoaotllvm  --aotcompilerpath "C:\Users\Meow\source\dotnet\BenchmarkTestHost\monoAOT_PR\sgen\mini\mono-sgen.exe" --customruntimepack "C:\Users\Meow\source\dotnet\BenchmarkTestHost\monoAOT_PR\pack"  --aotcompilermode llvm

Results:

PR:

BenchmarkDotNet v0.13.12, Windows 11 (10.0.22631.3593/23H2/2023Update/SunValley3)
13th Gen Intel Core i9-13900K, 1 CPU, 32 logical and 24 physical cores
.NET SDK 9.0.100-preview.4.24267.66
  [Host]     : .NET 8.0.5 (8.0.524.21615), X64 RyuJIT AVX2
  Job-FQWQJE : .NET 9.0.0 (42.42.42.42424) using MonoVM, X64 X86Base

Affinity=00000000000000001111111111111111  Runtime=MonoAOTLLVM  Toolchain=MonoAOTLLVM

Method	value	format	Mean	Error	StdDev
ToStringFormat	0	E	126.13 ns	0.378 ns	0.354 ns
ToStringFormat	0	F0	71.27 ns	0.440 ns	0.412 ns
ToStringFormat	0	F10	104.93 ns	0.545 ns	0.510 ns
ToStringFormat	0	G	59.68 ns	0.524 ns	0.490 ns
DefaultToString	0	?	54.44 ns	0.567 ns	0.530 ns
ToStringFormat	1	E	359.80 ns	1.770 ns	1.655 ns
ToStringFormat	1	F0	258.08 ns	1.218 ns	1.080 ns
ToStringFormat	1	F10	298.01 ns	1.273 ns	1.191 ns
ToStringFormat	1	G	154.68 ns	0.510 ns	0.477 ns
DefaultToString	1	?	148.94 ns	0.666 ns	0.623 ns
ToStringFormat	1234.5678	E	214.97 ns	1.181 ns	1.105 ns
ToStringFormat	1234.5678	F0	338.89 ns	1.577 ns	1.475 ns
ToStringFormat	1234.5678	F10	501.09 ns	2.710 ns	2.535 ns
ToStringFormat	1234.5678	G	212.78 ns	1.048 ns	0.929 ns
DefaultToString	1234.5678	?	209.32 ns	1.529 ns	1.430 ns
ToStringFormat	1.098(...)6E+30 [22]	E	196.33 ns	1.254 ns	1.112 ns
ToStringFormat	1.098(...)6E+30 [22]	F0	1,053.69 ns	5.062 ns	4.487 ns
ToStringFormat	1.098(...)6E+30 [22]	F10	1,189.30 ns	5.812 ns	5.436 ns
ToStringFormat	1.098(...)6E+30 [22]	G	287.90 ns	2.102 ns	1.966 ns
DefaultToString	1.098(...)6E+30 [22]	?	282.25 ns	1.599 ns	1.496 ns

main:

Method	value	format	Mean	Error	StdDev
ToStringFormat	0	E	120.53 ns	1.899 ns	1.776 ns
ToStringFormat	0	F0	70.56 ns	0.576 ns	0.481 ns
ToStringFormat	0	F10	103.54 ns	1.347 ns	1.260 ns
ToStringFormat	0	G	57.83 ns	0.352 ns	0.329 ns
DefaultToString	0	?	54.52 ns	0.466 ns	0.413 ns
ToStringFormat	1	E	345.41 ns	5.116 ns	4.786 ns
ToStringFormat	1	F0	260.28 ns	0.619 ns	0.549 ns
ToStringFormat	1	F10	305.23 ns	3.058 ns	2.860 ns
ToStringFormat	1	G	149.78 ns	1.623 ns	1.518 ns
DefaultToString	1	?	146.37 ns	1.783 ns	1.668 ns
ToStringFormat	1234.5678	E	220.22 ns	2.379 ns	2.109 ns
ToStringFormat	1234.5678	F0	351.67 ns	2.425 ns	2.150 ns
ToStringFormat	1234.5678	F10	512.52 ns	8.060 ns	7.539 ns
ToStringFormat	1234.5678	G	208.87 ns	0.888 ns	0.831 ns
DefaultToString	1234.5678	?	204.73 ns	0.748 ns	0.699 ns
ToStringFormat	1.098(...)6E+30 [22]	E	194.07 ns	2.028 ns	1.798 ns
ToStringFormat	1.098(...)6E+30 [22]	F0	1,090.41 ns	13.084 ns	10.925 ns
ToStringFormat	1.098(...)6E+30 [22]	F10	1,208.15 ns	14.228 ns	13.309 ns
ToStringFormat	1.098(...)6E+30 [22]	G	290.50 ns	2.323 ns	2.173 ns
DefaultToString	1.098(...)6E+30 [22]	?	286.22 ns	2.756 ns	2.578 ns

Looks no significant regression.

tannergooding · 2024-06-02T21:13:27Z

I can get this merged after the Mono team signs off and n the perf numbers, just want to make sure we’re not missing any important scenarios

tannergooding · 2024-06-03T17:51:28Z

@fanyang-mono, are there any other areas you want to see tested or does this look good for the Mono side?

fanyang-mono · 2024-06-03T18:13:49Z

These tests should be sufficient for mono. :)

tannergooding · 2024-06-03T18:25:47Z

src/libraries/System.Private.CoreLib/src/System/Double.cs

@@ -354,33 +354,33 @@ public override int GetHashCode()

        public override string ToString()
        {
-            return Number.FormatDouble(m_value, null, NumberFormatInfo.CurrentInfo);
+            return Number.FormatFloat(m_value, null, NumberFormatInfo.CurrentInfo);


Not going to block on this, but we should probably call this FormatFloatingPoint instead and it would be good to fix it in a follow up PR.

Float is going to be confused with the C# keyword float, which should be called Single in the BCL API surface area

tannergooding · 2024-06-03T18:30:04Z

src/libraries/System.Private.CoreLib/src/System/Number.Formatting.cs

+        private static ulong ExtractFractionAndBiasedExponent<TNumber>(TNumber value, out int exponent)
+            where TNumber : unmanaged, IBinaryFloatParseAndFormatInfo<TNumber>
+        {
+            ulong bits = TNumber.FloatToBits(value);


Similar here, this should probably be FloatingPointToBits

huoyaoyuan added 6 commits May 25, 2024 13:01

Generic DiyFp

82d74f2

Generic Grisu3

7139a31

Generic Dragon4

c861be8

Add MaxRoundTripDigits to MaxPrecisionCustomFormat to FormatInfo

e00ff8a

Generic FormatFloat

a6b06d0

Adapt with existing FP types

f3508bd

ghost added the area-System.Numerics label May 25, 2024

dotnet-policy-service bot added the community-contribution Indicates that the PR has been added by a community member label May 25, 2024

huoyaoyuan commented May 25, 2024

View reviewed changes

src/libraries/System.Private.CoreLib/src/System/Number.Formatting.cs Show resolved Hide resolved

Fix ExtractFractionAndBiasedExponent

f973ead

huoyaoyuan commented May 27, 2024

View reviewed changes

src/libraries/System.Private.CoreLib/src/System/Number.Formatting.cs Show resolved Hide resolved

build-analysis bot mentioned this pull request May 27, 2024

[Test Failure] System.Net.Sockets.Tests.SocketAsyncEventArgsTest.Connect_WithData_OK #102650

Closed

tannergooding reviewed Jun 3, 2024

View reviewed changes

tannergooding approved these changes Jun 3, 2024

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tannergooding merged commit a4407a1 into dotnet:main Jun 3, 2024

huoyaoyuan deleted the fp-format-generic branch June 4, 2024 02:06

This was referenced Jun 14, 2024

[mono][Perf] MonoAOT Perf_Single and Perf_Double Regressions on 6/3/2024 6:35:27 PM #104076

Open

[Perf] Windows/x64: 13 Regressions on 6/4/2024 9:00:06 AM dotnet/perf-autofiling-issues#35656

Closed

matouskozak mentioned this pull request Jun 29, 2024

.NET 9 per-preview performance overview #98209

Closed

github-actions bot locked and limited conversation to collaborators Jul 4, 2024

Use generic math for floating point formatting #102683

Use generic math for floating point formatting #102683

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