System.Xml.NameTable optimizations #49988

kronic · 2021-03-22T10:42:11Z

Slight simplification and acceleration NameTable

dotnet-runtimeinfo

**.NET information Version: 5.0.4 FrameworkDescription: .NET 5.0.4 Libraries version: 5.0.4 Libraries hash: f27d337

**Environment information
OSDescription: Microsoft Windows 10.0.19042
OSVersion: Microsoft Windows NT 10.0.19042.0
OSArchitecture: X64
ProcessorCount: 16

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
AddArrNew	16.256 ns	0.2401 ns	0.2246 ns	0.0048	-	-	40 B
AddArrOld	16.313 ns	0.1947 ns	0.1821 ns	0.0048	-	-	40 B
AddNew	5.524 ns	0.0376 ns	0.0333 ns	-	-	-	-
AddOld	7.823 ns	0.0560 ns	0.0524 ns	-	-	-	-
GetArrNew	10.876 ns	0.2736 ns	0.3257 ns	0.0048	-	-	40 B
GetArrOld	12.917 ns	0.2528 ns	0.2365 ns	0.0048	-	-	40 B
GetNew	3.810 ns	0.0316 ns	0.0281 ns	-	-	-	-
GetOld	5.989 ns	0.0177 ns	0.0165 ns	-	-	-	-

code benchmark

using System;
using System.IO;
using System.Xml;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

[MemoryDiagnoser]
public class Program
{
	private const string XmlTestData = @"<?xml version=""1.0""?>
<PurchaseOrders xmlns=""www.contoso.com"">
  <PurchaseOrder
      PurchaseOrderNumber=""99503""
      OrderDate=""1999-10-20"">
    <Address Type=""Shipping"">
      <Name>Ellen Adams</Name>
      <Street>123 Maple Street</Street>
      <City>Mill Valley</City>
      <State>CA</State>
      <Zip>10999</Zip>
      <Country>USA</Country>
    </Address>
    <Address Type=""Billing"">
      <Name>Tai Yee</Name>
      <Street>8 Oak Avenue</Street>
      <City>Old Town</City>
      <State>PA</State>
      <Zip>95819</Zip>
      <Country>USA</Country>
    </Address>
    <DeliveryNotes>Please leave packages in shed by driveway.</DeliveryNotes>
    <Items>
      <Item PartNumber=""872-AA"">
        <ProductName>Lawnmower</ProductName>
        <Quantity>1</Quantity>
        <USPrice>148.95</USPrice>
        <Comment>Confirm this is electric</Comment>
      </Item>
      <Item PartNumber=""926-AA"">
        <ProductName>Baby Monitor</ProductName>
        <Quantity>2</Quantity>
        <USPrice>39.98</USPrice>
        <ShipDate>1999-05-21</ShipDate>
      </Item>
    </Items>
  </PurchaseOrder>
  <PurchaseOrder PurchaseOrderNumber=""99505"" OrderDate=""1999-10-22"">
    <Address Type=""Shipping"">
      <Name>Cristian Osorio</Name>
      <Street>456 Main Street</Street>
      <City>Buffalo</City>
      <State>NY</State>
      <Zip>98112</Zip>
      <Country>USA</Country>
    </Address>
    <Address Type=""Billing"">
      <Name>Cristian Osorio</Name>
      <Street>456 Main Street</Street>
      <City>Buffalo</City>
      <State>NY</State>
      <Zip>98112</Zip>
      <Country>USA</Country>
    </Address>
    <DeliveryNotes>Please notify by email before shipping.</DeliveryNotes>
    <Items>
      <Item PartNumber=""456-NM"">
        <ProductName>Power Supply</ProductName>
        <Quantity>1</Quantity>
        <USPrice>45.99</USPrice>
      </Item>
    </Items>
  </PurchaseOrder>
  <PurchaseOrder PurchaseOrderNumber=""99504"" OrderDate=""1999-10-22"">
    <Address Type=""Shipping"">
      <Name>Jessica Arnold</Name>
      <Street>4055 Madison Ave</Street>
      <City>Seattle</City>
      <State>WA</State>
      <Zip>98112</Zip>
      <Country>USA</Country>
    </Address>
    <Address Type=""Billing"">
      <Name>Jessica Arnold</Name>
      <Street>4055 Madison Ave</Street>
      <City>Buffalo</City>
      <State>NY</State>
      <Zip>98112</Zip>
      <Country>USA</Country>
    </Address>
    <DeliveryNotes>Please don't deliver on Saturday.</DeliveryNotes>
    <Items>
      <Item PartNumber=""898-AZ"">
        <ProductName>Computer Keyboard</ProductName>
        <Quantity>1</Quantity>
        <USPrice>29.99</USPrice>
      </Item>
      <Item PartNumber=""898-AM"">
        <ProductName>Wireless Mouse</ProductName>
        <Quantity>1</Quantity>
        <USPrice>14.99</USPrice>
      </Item>
    </Items>
  </PurchaseOrder>
  <aw:PurchaseOrder
    PONumber=""11223""
    Date=""2000-01-15""
    xmlns:aw=""http://www.adventure-works.com"">
    <aw:ShippingAddress>
      <aw:Name>Chris Preston</aw:Name>
      <aw:Street>123 Main St.</aw:Street>
      <aw:City>Seattle</aw:City>
      <aw:State>WA</aw:State>
      <aw:Zip>98113</aw:Zip>
      <aw:Country>USA</aw:Country>
    </aw:ShippingAddress>
    <aw:BillingAddress>
      <aw:Name>Chris Preston</aw:Name>
      <aw:Street>123 Main St.</aw:Street>
      <aw:City>Seattle</aw:City>
      <aw:State>WA</aw:State>
      <aw:Zip>98113</aw:Zip>
      <aw:Country>USA</aw:Country>
    </aw:BillingAddress>
    <aw:DeliveryInstructions>Ship only complete order.</aw:DeliveryInstructions>
    <aw:Item PartNum=""LIT-01"">
      <aw:ProductID>Litware Networking Card</aw:ProductID>
      <aw:Qty>1</aw:Qty>
      <aw:Price>20.99</aw:Price>
    </aw:Item>
    <aw:Item PartNum=""LIT-25"">
      <aw:ProductID>Litware 17in LCD Monitor</aw:ProductID>
      <aw:Qty>1</aw:Qty>
      <aw:Price>199.99</aw:Price>
    </aw:Item>
  </aw:PurchaseOrder>
</PurchaseOrders>";

	private readonly NameTable1 _nameTableNew;
	private readonly NameTable _nameTableOld;
	public Program()
	{
		_nameTableOld = new NameTable();

		using (XmlReader.Create
		(
			new StringReader(XmlTestData),
			new XmlReaderSettings
			{
				NameTable = _nameTableOld, CloseInput = true
			}
		))
		{
		}

		_nameTableNew = new NameTable1();

		using (XmlReader.Create
		(
			new StringReader(XmlTestData),
			new XmlReaderSettings
			{
				NameTable = _nameTableNew, CloseInput = true
			}
		))
		{
		}
	}
	[Benchmark]
	public string AddArrNew() => _nameTableNew.Add("aw:Zip".ToCharArray(), 0, 2);
	[Benchmark]
	public string AddArrOld() => _nameTableNew.Add("aw:Zip".ToCharArray(), 0, 2);
	[Benchmark]
	public string AddNew() => _nameTableNew.Add("Country");
	[Benchmark]
	public string AddOld() => _nameTableOld.Add("Country");
	[Benchmark]
	public string? GetArrNew() => _nameTableNew.Get("aw:Qty".ToCharArray(), 3, 3);
	[Benchmark]
	public string? GetArrOld() => _nameTableOld.Get("aw:Qty".ToCharArray(), 3, 3);
	[Benchmark]
	public string? GetNew() => _nameTableNew.Get("City");
	[Benchmark]
	public string? GetOld() => _nameTableOld.Get("City");
	private static void Main()
	{
		var summary = BenchmarkRunner.Run<Program>();
		Console.WriteLine(summary);
	}
}

ghost · 2021-03-22T10:42:21Z

Tagging subscribers to this area: @buyaa-n, @krwq
See info in area-owners.md if you want to be subscribed.

Issue Details

Slight simplification and acceleration NameTable

Author:	kronic
Assignees:	-
Labels:	`area-System.Xml`
Milestone:	-

stephentoub · 2021-03-22T13:29:19Z

src/libraries/System.Private.Xml/src/System/Xml/NameTable.cs

-                }
-            }
-            return true;
+            return str1.AsSpan().Equals(str2.AsSpan(str2Start, str2Length), StringComparison.Ordinal);


Suggested change

return str1.AsSpan().Equals(str2.AsSpan(str2Start, str2Length), StringComparison.Ordinal);

return str1.AsSpan().SequenceEqual(str2.AsSpan(str2Start, str2Length));

Ok @stephentoub

Method Mean Error StdDev Gen 0 Gen 1 Gen 2 Allocated

AddArrNew 15.742 ns 0.0879 ns 0.0779 ns 0.0048 - - 40 B

AddArrNewSequenceEqual 12.718 ns 0.1066 ns 0.0945 ns 0.0048 - - 40 B

AddArrOld 15.674 ns 0.0632 ns 0.0591 ns 0.0048 - - 40 B

AddNew 5.866 ns 0.0524 ns 0.0491 ns - - - -

AddNewSequenceEqual 5.448 ns 0.0240 ns 0.0225 ns - - - -

AddOld 8.153 ns 0.0399 ns 0.0374 ns - - - -

GetArrNew 10.552 ns 0.0469 ns 0.0416 ns 0.0048 - - 40 B

GetArrNewSequenceEqual 10.329 ns 0.0571 ns 0.0534 ns 0.0048 - - 40 B

GetArrOld 13.466 ns 0.0654 ns 0.0580 ns 0.0048 - - 40 B

GetNew 3.664 ns 0.0162 ns 0.0143 ns - - - -

GetNewSequenceEqual 3.702 ns 0.0190 ns 0.0178 ns - - - -

GetOld 5.999 ns 0.0330 ns 0.0276 ns - - - -

using System; using System.IO; using System.Xml; using BenchmarkDotNet.Attributes; using BenchmarkDotNet.Running; [MemoryDiagnoser] public class Program { private const string XmlTestData = @"<?xml version=""1.0""?> <PurchaseOrders xmlns=""www.contoso.com""> <PurchaseOrder PurchaseOrderNumber=""99503"" OrderDate=""1999-10-20""> <Address Type=""Shipping""> <Name>Ellen Adams</Name> <Street>123 Maple Street</Street> <City>Mill Valley</City> <State>CA</State> <Zip>10999</Zip> <Country>USA</Country> </Address> <Address Type=""Billing""> <Name>Tai Yee</Name> <Street>8 Oak Avenue</Street> <City>Old Town</City> <State>PA</State> <Zip>95819</Zip> <Country>USA</Country> </Address> <DeliveryNotes>Please leave packages in shed by driveway.</DeliveryNotes> <Items> <Item PartNumber=""872-AA""> <ProductName>Lawnmower</ProductName> <Quantity>1</Quantity> <USPrice>148.95</USPrice> <Comment>Confirm this is electric</Comment> </Item> <Item PartNumber=""926-AA""> <ProductName>Baby Monitor</ProductName> <Quantity>2</Quantity> <USPrice>39.98</USPrice> <ShipDate>1999-05-21</ShipDate> </Item> </Items> </PurchaseOrder> <PurchaseOrder PurchaseOrderNumber=""99505"" OrderDate=""1999-10-22""> <Address Type=""Shipping""> <Name>Cristian Osorio</Name> <Street>456 Main Street</Street> <City>Buffalo</City> <State>NY</State> <Zip>98112</Zip> <Country>USA</Country> </Address> <Address Type=""Billing""> <Name>Cristian Osorio</Name> <Street>456 Main Street</Street> <City>Buffalo</City> <State>NY</State> <Zip>98112</Zip> <Country>USA</Country> </Address> <DeliveryNotes>Please notify by email before shipping.</DeliveryNotes> <Items> <Item PartNumber=""456-NM""> <ProductName>Power Supply</ProductName> <Quantity>1</Quantity> <USPrice>45.99</USPrice> </Item> </Items> </PurchaseOrder> <PurchaseOrder PurchaseOrderNumber=""99504"" OrderDate=""1999-10-22""> <Address Type=""Shipping""> <Name>Jessica Arnold</Name> <Street>4055 Madison Ave</Street> <City>Seattle</City> <State>WA</State> <Zip>98112</Zip> <Country>USA</Country> </Address> <Address Type=""Billing""> <Name>Jessica Arnold</Name> <Street>4055 Madison Ave</Street> <City>Buffalo</City> <State>NY</State> <Zip>98112</Zip> <Country>USA</Country> </Address> <DeliveryNotes>Please don't deliver on Saturday.</DeliveryNotes> <Items> <Item PartNumber=""898-AZ""> <ProductName>Computer Keyboard</ProductName> <Quantity>1</Quantity> <USPrice>29.99</USPrice> </Item> <Item PartNumber=""898-AM""> <ProductName>Wireless Mouse</ProductName> <Quantity>1</Quantity> <USPrice>14.99</USPrice> </Item> </Items> </PurchaseOrder> <aw:PurchaseOrder PONumber=""11223"" Date=""2000-01-15"" xmlns:aw=""http://www.adventure-works.com""> <aw:ShippingAddress> <aw:Name>Chris Preston</aw:Name> <aw:Street>123 Main St.</aw:Street> <aw:City>Seattle</aw:City> <aw:State>WA</aw:State> <aw:Zip>98113</aw:Zip> <aw:Country>USA</aw:Country> </aw:ShippingAddress> <aw:BillingAddress> <aw:Name>Chris Preston</aw:Name> <aw:Street>123 Main St.</aw:Street> <aw:City>Seattle</aw:City> <aw:State>WA</aw:State> <aw:Zip>98113</aw:Zip> <aw:Country>USA</aw:Country> </aw:BillingAddress> <aw:DeliveryInstructions>Ship only complete order.</aw:DeliveryInstructions> <aw:Item PartNum=""LIT-01""> <aw:ProductID>Litware Networking Card</aw:ProductID> <aw:Qty>1</aw:Qty> <aw:Price>20.99</aw:Price> </aw:Item> <aw:Item PartNum=""LIT-25""> <aw:ProductID>Litware 17in LCD Monitor</aw:ProductID> <aw:Qty>1</aw:Qty> <aw:Price>199.99</aw:Price> </aw:Item> </aw:PurchaseOrder> </PurchaseOrders>"; private readonly NameTable1 _nameTableSpanEqual; private readonly NameTable _nameTableOld; private readonly NameTable2 _nameTableNewSequenceEqual; public Program() { _nameTableOld = new NameTable(); using (XmlReader.Create ( new StringReader(XmlTestData), new XmlReaderSettings { NameTable = _nameTableOld, CloseInput = true } )) { } _nameTableSpanEqual = new NameTable1(); using (XmlReader.Create ( new StringReader(XmlTestData), new XmlReaderSettings { NameTable = _nameTableSpanEqual, CloseInput = true } )) { } _nameTableNewSequenceEqual = new NameTable2(); using (XmlReader.Create ( new StringReader(XmlTestData), new XmlReaderSettings { NameTable = _nameTableNewSequenceEqual, CloseInput = true } )) { } } [Benchmark] public string AddArrNew() => _nameTableSpanEqual.Add("aw:Zip".ToCharArray(), 0, 2); [Benchmark] public string AddArrNewSequenceEqual() => _nameTableNewSequenceEqual.Add("aw:Zip".ToCharArray(), 0, 2); [Benchmark] public string AddArrOld() => _nameTableSpanEqual.Add("aw:Zip".ToCharArray(), 0, 2); [Benchmark] public string AddNew() => _nameTableSpanEqual.Add("Country"); [Benchmark] public string AddNewSequenceEqual() => _nameTableNewSequenceEqual.Add("Country"); [Benchmark] public string AddOld() => _nameTableOld.Add("Country"); [Benchmark] public string? GetArrNew() => _nameTableSpanEqual.Get("aw:Qty".ToCharArray(), 3, 3); [Benchmark] public string? GetArrNewSequenceEqual() => _nameTableNewSequenceEqual.Get("aw:Qty".ToCharArray(), 3, 3); [Benchmark] public string? GetArrOld() => _nameTableOld.Get("aw:Qty".ToCharArray(), 3, 3); [Benchmark] public string? GetNew() => _nameTableSpanEqual.Get("City"); [Benchmark] public string? GetNewSequenceEqual() => _nameTableNewSequenceEqual.Get("City"); [Benchmark] public string? GetOld() => _nameTableOld.Get("City"); private static void Main() { var summary = BenchmarkRunner.Run<Program>(); Console.WriteLine(summary); } }

kronic · 2021-03-22T19:56:06Z

@stephentoub done

stephentoub

At this point it probably doesn't need its own method; it could instead be inlined into the two call sites that use it, which would also help to make clear why the str2Start/str2Length will always be in bounds.

kronic · 2021-03-22T20:08:01Z

@stephentoub I will fix it. Is it worth it to also inline the ComputeHash32 method?

kronic · 2021-03-23T07:41:45Z

@stephentoub Ready for review

krwq · 2021-03-23T10:52:11Z

/azp help

azure-pipelines · 2021-03-23T10:52:15Z

Supported commands help: Get descriptions, examples and documentation about supported commands Example: help "command_name" list: List all pipelines for this repository using a comment. Example: "list" run: Run all pipelines or specific pipelines for this repository using a comment. Use this command by itself to trigger all related pipelines, or specify specific pipelines to run. Example: "run" or "run pipeline_name, pipeline_name, pipeline_name" where: Report back the Azure DevOps orgs that are related to this repository and org Example: "where" See additional documentation.

krwq · 2021-03-23T10:52:25Z

/azp list

azure-pipelines · 2021-03-23T10:52:30Z

CI/CD Pipelines for this repository: coreclr-gc-longrunning coreclr-gc-simulator runtime-coreclr outerloop runtime-coreclr jitstress runtime-coreclr jitstressregs runtime-coreclr jitstress2-jitstressregs runtime-coreclr r2r-extra runtime-coreclr jitstress-isas-x86 runtime-coreclr jitstress-isas-arm runtime-coreclr jitstressregs-x86 runtime-coreclr libraries-jitstressregs runtime-coreclr libraries-jitstress2-jitstressregs runtime-coreclr r2r runtime-coreclr runincontext runtime-coreclr crossgen2 runtime-libraries-coreclr outerloop runtime-libraries-coreclr outerloop-windows runtime-libraries-coreclr outerloop-linux runtime-libraries-coreclr outerloop-osx runtime runtime-libraries enterprise-linux runtime-libraries stress-http runtime-libraries stress-ssl runtime-dev-innerloop runtime-coreclr crossgen2 outerloop coreclr-release-outerloop-nightly sync-runtime-to-mono runtime-coreclr crossgen2-composite runtime-jit-experimental runtime-coreclr libraries-jitstress dotnet-linker-tests runtime-coreclr ilasm runtime-coreclr clrinterpreter runtime-coreclr crossgen2-composite gcstress runtime-libraries-mono outerloop runtime-staging

krwq · 2021-03-23T10:52:52Z

/azp run runtime-libraries-coreclr outerloop

azure-pipelines · 2021-03-23T10:53:06Z

Azure Pipelines successfully started running 1 pipeline(s).

krwq

thanks

stephentoub · 2021-03-24T13:32:24Z

Thanks.

Slight simplification and acceleration

7e4a243

dotnet-issue-labeler bot added the area-System.Xml label Mar 22, 2021

kronic changed the title ~~System.Xml.NameTable~~ System.Xml.NameTable optimizations Mar 22, 2021

stephentoub reviewed Mar 22, 2021

View reviewed changes

use SequenceEqual

d7757e2

stephentoub approved these changes Mar 22, 2021

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kronic added 5 commits March 23, 2021 09:30

fix nullability

4170377

innline TextEquals

f59a4ee

Inline ComputeHash32

f16f184

remove using

574ced6

fix nullability

323d12a

krwq approved these changes Mar 23, 2021

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stephentoub approved these changes Mar 24, 2021

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stephentoub merged commit cc10f27 into dotnet:main Mar 24, 2021

ghost locked as resolved and limited conversation to collaborators Apr 23, 2021

karelz added this to the 6.0.0 milestone May 20, 2021

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System.Xml.NameTable optimizations #49988

System.Xml.NameTable optimizations #49988

kronic commented Mar 22, 2021 •

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stephentoub commented Mar 24, 2021

	return str1.AsSpan().Equals(str2.AsSpan(str2Start, str2Length), StringComparison.Ordinal);
	return str1.AsSpan().SequenceEqual(str2.AsSpan(str2Start, str2Length));

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
AddArrNew	15.742 ns	0.0879 ns	0.0779 ns	0.0048	-	-	40 B
AddArrNewSequenceEqual	12.718 ns	0.1066 ns	0.0945 ns	0.0048	-	-	40 B
AddArrOld	15.674 ns	0.0632 ns	0.0591 ns	0.0048	-	-	40 B
AddNew	5.866 ns	0.0524 ns	0.0491 ns	-	-	-	-
AddNewSequenceEqual	5.448 ns	0.0240 ns	0.0225 ns	-	-	-	-
AddOld	8.153 ns	0.0399 ns	0.0374 ns	-	-	-	-
GetArrNew	10.552 ns	0.0469 ns	0.0416 ns	0.0048	-	-	40 B
GetArrNewSequenceEqual	10.329 ns	0.0571 ns	0.0534 ns	0.0048	-	-	40 B
GetArrOld	13.466 ns	0.0654 ns	0.0580 ns	0.0048	-	-	40 B
GetNew	3.664 ns	0.0162 ns	0.0143 ns	-	-	-	-
GetNewSequenceEqual	3.702 ns	0.0190 ns	0.0178 ns	-	-	-	-
GetOld	5.999 ns	0.0330 ns	0.0276 ns	-	-	-	-

System.Xml.NameTable optimizations #49988

System.Xml.NameTable optimizations #49988

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