.Net 7性能改进-JIT
前言
本文是Performance Improvements in .NET 7 JIT部分的翻译.下面开始正文:我想首先讨论一下即时编译器(JIT)中的性能改进,讨论的内容本身并不是性能改进.在低层、性能敏感的代码时,能够准确理解JIT生成的汇编代码是至关重要的.有多种方法可以获取该汇编代码.在线工具sharplab.io对此非常有用(感谢@ashmind提供此工具);然而,它目前只针对单个版本，因此在编写本文时，我只能看到.NET6的输出,这使得很难将其用于A/B多版本测试.godbolt.org在这方面也很有价值,在@hez2010在compiler-explorer/compiler-explorer#3168中添加了C#支持,具有类似单个版本的限制.最灵活的解决方案涉及在本地获取该程序集代码,因为它可以将您所需的任何版本或本地构建与所需的配置和开关集进行比较.
一种常见的方法是在benchmarkdotnet中使用[DisassemblyDiagnoser]特性。只需将[DisassemblyDiagnosis]特性添加到测试类中,benchmarkdotnet将查找为测试生成的汇编代码以及它们调用的函数的深度,并以人类可读的形式转储找到的汇编代码.例如,如果我运行此测试:
using BenchmarkDotNet.Attributes;
namespace net7perf.Maths
{
[DisassemblyDiagnoser]
public class MathTest
{
private int _a = 42, _b = 84;
[Benchmark]
public int Min() => Math.Min(_a, _b);
}
}运行命令:
# --filter '*MathTest*' 指定运行MathTest下的Benchmark特性方法
dotnet run -c Release -f net7.0 --filter '*MathTest*'除了正常的测试,BenchmarkDotNet是可以将汇编代码保存为单个文件MathTest.md.
; net7perf.Maths.MathTest.Min()
mov eax,[rcx+8]
mov edx,[rcx+0C]
cmp eax,edx
jg short M00_L01
mov edx,eax
M00_L00:
mov eax,edx
ret
M00_L01:
jmp short M00_L00
; Total bytes of code 17生成的汇编代码格式相当整洁.这种支持最近在dotnet/benchmarkdotnet#2072中得到了进一步改进,它允许在命令行上向benchmarkdotnet传递一个过滤器列表,以准确地告诉它应该转储哪些方法的汇编代码.
如果您可以获得.NET运行时的“调试”或“检查”版本("检查"是启用了优化但仍包含断言的版本),尤其是clrjit,另一种有价值的方法是设置一个环境变量,该环境变量使JIT本身对其发出的所有汇编代码进行可读的描述.这可以用于任何类型的应用程序,因为它是JIT本身的一部分,而不是任何特定工具或其他环境的一部分.它支持显示JIT每次生成代码时生成的代码(例如,如果它首先编译一个没有优化的方法,然后用优化重新编译),总的来说,这是汇编代码最准确的图片.当然,最大的缺点是它需要非发布版本的运行时,这通常意味着您需要从dotnet/runtime repo中的源代码自己构建。
直到.NET 7,也就是说,从dotnet/runtime#73365开始,这个程序集转储支持现在也可以在发布版本中使用,这意味着它只是.NET7的一部分,您不需要任何特殊的东西来使用它.要了解这一点,请尝试创建一个简单的“hello world”应用程序,如:
using System;
class Program
{
public static void Main() => Console.WriteLine("Hello, world!");
}编译程序(如dotnet build-c Release).然后,将DOTNET_JitDisasm 环境变量设置为我们需要关心的方法名称,在本例中为“Main”(允许的确切语法更为宽松,允许使用通配符、可选名称空间和类名等).当我使用PowerShell添加环境变量:
# 1. 编译程序
dotnet build -c Release
# 2.Main为需要生成汇编代码的方法名称,添加环境变量
$env:DOTNET_JitDisasm="Main"
# 3.运行程序
dotnet run运行程序后,会在控制台中打印出指定方法的汇编代码:
; Assembly listing for method Program:Main(ref)
; Emitting BLENDED_CODE for X64 CPU with AVX - Windows
; debuggable code
; rbp based frame
; fully interruptible
; No PGO data
G_M000_IG01: ;; offset=0000H
55 push rbp
57 push rdi
4883EC28 sub rsp, 40
488D6C2430 lea rbp, [rsp+30H]
48894D10 mov gword ptr [rbp+10H], rcx
G_M000_IG02: ;; offset=000FH
833DD2C80B0000 cmp dword ptr [(reloc 0x7ffcccf3cf98)], 0
7405 je SHORT G_M000_IG04
G_M000_IG03: ;; offset=0018H
E82366C25F call CORINFO_HELP_DBG_IS_JUST_MY_CODE
G_M000_IG04: ;; offset=001DH
90 nop
48B96820009DD5020000 mov rcx, 0x2D59D002068
488B09 mov rcx, gword ptr [rcx]
FF15FF101000 call [Console:WriteLine(String)]
90 nop
90 nop
G_M000_IG05: ;; offset=0033H
4883C428 add rsp, 40
5F pop rdi
5D pop rbp
C3 ret
; Total bytes of code 58
Hello, world!这对于性能分析和调优非常有帮助,甚至对于像“我的函数是否内联”或“我期望优化的代码是否真的被优化掉了”这样简单的问题也是如此.在这篇文章的其余部分，我将包括由这两种机制之一生成的汇编代码片段,以帮助举例说明概念.
请注意,有时在确定指定什么名称作为DOTNET_JitDisasm的值时可能会有点混乱，特别是当您所关心的方法是C#编译器名称或名称混乱的方法时(因为JIT只看到IL和元数据，而不是原始的C#代码)例如,具有顶级语句的程序的入口点方法的名称、本地函数的名称等.为了帮助实现这一点，并提供JIT正在进行的工作的真正有价值的顶层视图，.NET 7还支持新的DOTNET_JitDisasmSummary 环境变量(在DOTNET/runtime#74090中引入).将其设置为“1”,它将导致JIT在每次编译方法时都发出一行,包括该方法的名称,该名称可使用DOTNET_JitDisasm复制/粘贴。但是，这个特性本身很有用，因为它可以快速地为您突出显示正在编译什么、何时编译以及使用什么设置。例如，如果我设置环境变量，然后运行“hello，world”控制台应用程序，会得到以下输出(7.0.100-rc.2.22457.11之前的版本,开启DOTNET_JitDisasmSummary=是不会出现下面输出的,7.0.100-rc.2.22457.11输出的信息更丰富)：
1: JIT compiled CastHelpers:StelemRef(Array,long,Object) [Tier1, IL size=88, code size=93]
2: JIT compiled CastHelpers:LdelemaRef(Array,long,long):byref [Tier1, IL size=44, code size=44]
3: JIT compiled SpanHelpers:IndexOfNullCharacter(byref):int [Tier1, IL size=792, code size=388]
4: JIT compiled Program:Main() [Tier0, IL size=11, code size=36]
5: JIT compiled ASCIIUtility:NarrowUtf16ToAscii(long,long,long):long [Tier0, IL size=490, code size=1187]
Hello, world!我们可以看到,对于“hello world”,实际上只有5个方法可以进行JIT编译.当然,作为简单的“hello world”的一部分执行的方法还有很多,但几乎所有方法都有预编译的本机代码,作为核心库的“准备运行”(R2R)映像的一部分.上面列表中的前三个(StelemRef、LdelemaRef和IndexOfNullCharacter)没有,因为它们通过使用[MethodImpl(MethodImplOptions.AggressiveOptimization)]属性显式选择退出R2R(尽管名称不同,但该属性几乎不应使用,并且仅在核心库中的几个非常特定的位置使用).然后是我们的Main方法.最后是NarrowUtf16ToAscii方法,由于使用了可变宽度Vector<T>,因此它也没有R2R代码(稍后将详细介绍).运行的所有其他方法都不需要JIT.如果我们首先将DOTNET_ReadyToRun环境变量设置为0,则列表会更长,并让您非常清楚地了解JIT在启动时需要做什么(以及为什么R2R等技术对启动时间很重要).注意在输出“hello world”之前编译了多少方法:
1: JIT compiled CastHelpers:StelemRef(Array,long,Object) [Tier1, IL size=88, code size=93]
2: JIT compiled CastHelpers:LdelemaRef(Array,long,long):byref [Tier1, IL size=44, code size=44]
3: JIT compiled AppContext:Setup(long,long,int) [Tier0, IL size=68, code size=275]
4: JIT compiled Dictionary`2:.ctor(int):this [Tier0, IL size=9, code size=40]
5: JIT compiled Dictionary`2:.ctor(int,IEqualityComparer`1):this [Tier0, IL size=102, code size=444]
6: JIT compiled Object:.ctor():this [Tier0, IL size=1, code size=10]
7: JIT compiled Dictionary`2:Initialize(int):int:this [Tier0, IL size=56, code size=231]
8: JIT compiled HashHelpers:GetPrime(int):int [Tier0, IL size=83, code size=379]
9: JIT compiled HashHelpers:.cctor() [Tier0, IL size=24, code size=102]
10: JIT compiled HashHelpers:GetFastModMultiplier(int):long [Tier0, IL size=9, code size=37]
11: JIT compiled Type:GetTypeFromHandle(RuntimeTypeHandle):Type [Tier0, IL size=8, code size=14]
12: JIT compiled Type:op_Equality(Type,Type):bool [Tier0, IL size=38, code size=143]
13: JIT compiled NonRandomizedStringEqualityComparer:GetStringComparer(Object):IEqualityComparer`1 [Tier0, IL size=39, code size=170]
14: JIT compiled NonRandomizedStringEqualityComparer:.cctor() [Tier0, IL size=46, code size=232]
15: JIT compiled EqualityComparer`1:get_Default():EqualityComparer`1 [Tier0, IL size=6, code size=36]
16: JIT compiled EqualityComparer`1:.cctor() [Tier0, IL size=26, code size=125]
17: JIT compiled ComparerHelpers:CreateDefaultEqualityComparer(Type):Object [Tier0, IL size=235, code size=949]
18: JIT compiled CastHelpers:ChkCastClass(long,Object):Object [Tier0, IL size=22, code size=72]
19: JIT compiled RuntimeHelpers:GetMethodTable(Object):long [Tier0, IL size=11, code size=33]
20: JIT compiled CastHelpers:IsInstanceOfClass(long,Object):Object [Tier0, IL size=97, code size=257]
21: JIT compiled GenericEqualityComparer`1:.ctor():this [Tier0, IL size=7, code size=31]
22: JIT compiled EqualityComparer`1:.ctor():this [Tier0, IL size=7, code size=31]
23: JIT compiled CastHelpers:ChkCastClassSpecial(long,Object):Object [Tier0, IL size=87, code size=246]
24: JIT compiled OrdinalComparer:.ctor(IEqualityComparer`1):this [Tier0, IL size=8, code size=39]
25: JIT compiled NonRandomizedStringEqualityComparer:.ctor(IEqualityComparer`1):this [Tier0, IL size=14, code size=52]
26: JIT compiled StringComparer:get_Ordinal():StringComparer [Tier0, IL size=6, code size=49]
27: JIT compiled OrdinalCaseSensitiveComparer:.cctor() [Tier0, IL size=11, code size=71]
28: JIT compiled OrdinalCaseSensitiveComparer:.ctor():this [Tier0, IL size=8, code size=33]
29: JIT compiled OrdinalComparer:.ctor(bool):this [Tier0, IL size=14, code size=43]
30: JIT compiled StringComparer:.ctor():this [Tier0, IL size=7, code size=31]
31: JIT compiled StringComparer:get_OrdinalIgnoreCase():StringComparer [Tier0, IL size=6, code size=49]
32: JIT compiled OrdinalIgnoreCaseComparer:.cctor() [Tier0, IL size=11, code size=71]
33: JIT compiled OrdinalIgnoreCaseComparer:.ctor():this [Tier0, IL size=8, code size=36]
34: JIT compiled OrdinalIgnoreCaseComparer:.ctor(IEqualityComparer`1):this [Tier0, IL size=8, code size=39]
35: JIT compiled CastHelpers:ChkCastAny(long,Object):Object [Tier0, IL size=38, code size=115]
36: JIT compiled CastHelpers:TryGet(long,long):int [Tier0, IL size=129, code size=308]
37: JIT compiled CastHelpers:TableData(ref):byref [Tier0, IL size=7, code size=31]
38: JIT compiled MemoryMarshal:GetArrayDataReference(ref):byref [Tier0, IL size=7, code size=24]
39: JIT compiled CastHelpers:KeyToBucket(byref,long,long):int [Tier0, IL size=38, code size=87]
40: JIT compiled CastHelpers:HashShift(byref):int [Tier0, IL size=3, code size=16]
41: JIT compiled BitOperations:RotateLeft(long,int):long [Tier0, IL size=17, code size=23]
42: JIT compiled CastHelpers:Element(byref,int):byref [Tier0, IL size=15, code size=33]
43: JIT compiled Volatile:Read(byref):int [Tier0, IL size=6, code size=16]
44: JIT compiled String:Ctor(long):String [Tier0, IL size=57, code size=155]
45: JIT compiled String:wcslen(long):int [Tier0, IL size=7, code size=31]
46: JIT compiled SpanHelpers:IndexOfNullCharacter(byref):int [Tier1, IL size=792, code size=388]
47: JIT compiled String:get_Length():int:this [Tier0, IL size=7, code size=17]
48: JIT compiled Buffer:Memmove(byref,byref,long) [Tier0, IL size=59, code size=102]
49: JIT compiled RuntimeHelpers:IsReferenceOrContainsReferences():bool [Tier0, IL size=2, code size=8]
50: JIT compiled Buffer:Memmove(byref,byref,long) [Tier0, IL size=480, code size=678]
51: JIT compiled Dictionary`2:Add(__Canon,__Canon):this [Tier0, IL size=11, code size=55]
52: JIT compiled Dictionary`2:TryInsert(__Canon,__Canon,ubyte):bool:this [Tier0, IL size=675, code size=2467]
53: JIT compiled OrdinalComparer:GetHashCode(String):int:this [Tier0, IL size=7, code size=37]
54: JIT compiled String:GetNonRandomizedHashCode():int:this [Tier0, IL size=110, code size=290]
55: JIT compiled BitOperations:RotateLeft(int,int):int [Tier0, IL size=17, code size=20]
56: JIT compiled Dictionary`2:GetBucket(int):byref:this [Tier0, IL size=29, code size=90]
57: JIT compiled HashHelpers:FastMod(int,int,long):int [Tier0, IL size=20, code size=70]
58: JIT compiled Type:get_IsValueType():bool:this [Tier0, IL size=7, code size=39]
59: JIT compiled RuntimeType:IsValueTypeImpl():bool:this [Tier0, IL size=54, code size=158]
60: JIT compiled RuntimeType:GetNativeTypeHandle():TypeHandle:this [Tier0, IL size=12, code size=48]
61: JIT compiled TypeHandle:.ctor(long):this [Tier0, IL size=8, code size=25]
62: JIT compiled TypeHandle:get_IsTypeDesc():bool:this [Tier0, IL size=14, code size=38]
63: JIT compiled TypeHandle:AsMethodTable():long:this [Tier0, IL size=7, code size=17]
64: JIT compiled MethodTable:get_IsValueType():bool:this [Tier0, IL size=20, code size=32]
65: JIT compiled GC:KeepAlive(Object) [Tier0, IL size=1, code size=10]
66: JIT compiled Buffer:_Memmove(byref,byref,long) [Tier0, IL size=25, code size=279]
67: JIT compiled Environment:InitializeCommandLineArgs(long,int,long):ref [Tier0, IL size=75, code size=332]
68: JIT compiled Environment:.cctor() [Tier0, IL size=11, code size=163]
69: JIT compiled StartupHookProvider:ProcessStartupHooks() [Tier-0 switched to FullOpts, IL size=365, code size=1053]
70: JIT compiled StartupHookProvider:get_IsSupported():bool [Tier0, IL size=18, code size=60]
71: JIT compiled AppContext:TryGetSwitch(String,byref):bool [Tier0, IL size=97, code size=322]
72: JIT compiled ArgumentException:ThrowIfNullOrEmpty(String,String) [Tier0, IL size=16, code size=53]
73: JIT compiled String:IsNullOrEmpty(String):bool [Tier0, IL size=15, code size=58]
74: JIT compiled AppContext:GetData(String):Object [Tier0, IL size=64, code size=205]
75: JIT compiled ArgumentNullException:ThrowIfNull(Object,String) [Tier0, IL size=10, code size=42]
76: JIT compiled Monitor:Enter(Object,byref) [Tier0, IL size=17, code size=55]
77: JIT compiled Dictionary`2:TryGetValue(__Canon,byref):bool:this [Tier0, IL size=39, code size=97]
78: JIT compiled Dictionary`2:FindValue(__Canon):byref:this [Tier0, IL size=391, code size=1466]
79: JIT compiled EventSource:.cctor() [Tier0, IL size=34, code size=80]
80: JIT compiled EventSource:InitializeIsSupported():bool [Tier0, IL size=18, code size=60]
81: JIT compiled RuntimeEventSource:.ctor():this [Tier0, IL size=55, code size=184]
82: JIT compiled Guid:.ctor(int,short,short,ubyte,ubyte,ubyte,ubyte,ubyte,ubyte,ubyte,ubyte):this [Tier0, IL size=86, code size=132]
83: JIT compiled EventSource:.ctor(Guid,String):this [Tier0, IL size=11, code size=90]
84: JIT compiled EventSource:.ctor(Guid,String,int,ref):this [Tier0, IL size=58, code size=187]
85: JIT compiled EventSource:get_IsSupported():bool [Tier0, IL size=6, code size=11]
86: JIT compiled TraceLoggingEventHandleTable:.ctor():this [Tier0, IL size=20, code size=67]
87: JIT compiled EventSource:ValidateSettings(int):int [Tier0, IL size=37, code size=147]
88: JIT compiled EventSource:Initialize(Guid,String,ref):this [Tier0, IL size=418, code size=1584]
89: JIT compiled Guid:op_Equality(Guid,Guid):bool [Tier0, IL size=10, code size=39]
90: JIT compiled Guid:EqualsCore(byref,byref):bool [Tier0, IL size=132, code size=171]
91: JIT compiled ActivityTracker:get_Instance():ActivityTracker [Tier0, IL size=6, code size=49]
92: JIT compiled ActivityTracker:.cctor() [Tier0, IL size=11, code size=71]
93: JIT compiled ActivityTracker:.ctor():this [Tier0, IL size=7, code size=31]
94: JIT compiled RuntimeEventSource:get_ProviderMetadata():ReadOnlySpan`1:this [Tier0, IL size=13, code size=91]
95: JIT compiled ReadOnlySpan`1:.ctor(long,int):this [Tier0, IL size=51, code size=115]
96: JIT compiled RuntimeHelpers:IsReferenceOrContainsReferences():bool [Tier0, IL size=2, code size=8]
97: JIT compiled ReadOnlySpan`1:get_Length():int:this [Tier0, IL size=7, code size=17]
98: JIT compiled OverrideEventProvider:.ctor(EventSource,int):this [Tier0, IL size=22, code size=68]
99: JIT compiled EventProvider:.ctor(int):this [Tier0, IL size=46, code size=194]
100: JIT compiled EtwEventProvider:.ctor():this [Tier0, IL size=7, code size=31]
101: JIT compiled EventProvider:Register(EventSource):this [Tier0, IL size=48, code size=186]
102: JIT compiled MulticastDelegate:CtorClosed(Object,long):this [Tier0, IL size=23, code size=70]
103: JIT compiled EventProvider:EventRegister(EventSource,EtwEnableCallback):int:this [Tier0, IL size=53, code size=154]
104: JIT compiled EventSource:get_Name():String:this [Tier0, IL size=7, code size=18]
105: JIT compiled EventSource:get_Guid():Guid:this [Tier0, IL size=7, code size=41]
106: JIT compiled EtwEventProvider:System.Diagnostics.Tracing.IEventProvider.EventRegister(EventSource,EtwEnableCallback,long,byref):int:this [Tier0, IL size=19, code size=71]
107: JIT compiled Advapi32:EventRegister(byref,EtwEnableCallback,long,byref):int [Tier0, IL size=53, code size=374]
108: JIT compiled Marshal:GetFunctionPointerForDelegate(__Canon):long [Tier0, IL size=17, code size=54]
109: JIT compiled Marshal:GetFunctionPointerForDelegate(Delegate):long [Tier0, IL size=18, code size=53]
110: JIT compiled EventPipeEventProvider:.ctor():this [Tier0, IL size=18, code size=41]
111: JIT compiled EventListener:get_EventListenersLock():Object [Tier0, IL size=41, code size=157]
112: JIT compiled List`1:.ctor(int):this [Tier0, IL size=47, code size=275]
113: JIT compiled Interlocked:CompareExchange(byref,__Canon,__Canon):__Canon [Tier0, IL size=9, code size=50]
114: JIT compiled NativeRuntimeEventSource:.cctor() [Tier0, IL size=11, code size=71]
115: JIT compiled NativeRuntimeEventSource:.ctor():this [Tier0, IL size=63, code size=184]
116: JIT compiled Guid:.ctor(int,ushort,ushort,ubyte,ubyte,ubyte,ubyte,ubyte,ubyte,ubyte,ubyte):this [Tier0, IL size=88, code size=132]
117: JIT compiled NativeRuntimeEventSource:get_ProviderMetadata():ReadOnlySpan`1:this [Tier0, IL size=13, code size=91]
118: JIT compiled EventPipeEventProvider:System.Diagnostics.Tracing.IEventProvider.EventRegister(EventSource,EtwEnableCallback,long,byref):int:this [Tier0, IL size=44, code size=118]
119: JIT compiled EventPipeInternal:CreateProvider(String,EtwEnableCallback):long [Tier0, IL size=43, code size=320]
120: JIT compiled Utf16StringMarshaller:GetPinnableReference(String):byref [Tier0, IL size=13, code size=50]
121: JIT compiled String:GetPinnableReference():byref:this [Tier0, IL size=7, code size=24]
122: JIT compiled EventListener:AddEventSource(EventSource) [Tier0, IL size=175, code size=560]
123: JIT compiled List`1:get_Count():int:this [Tier0, IL size=7, code size=17]
124: JIT compiled WeakReference`1:.ctor(__Canon):this [Tier0, IL size=9, code size=42]
125: JIT compiled WeakReference`1:.ctor(__Canon,bool):this [Tier0, IL size=15, code size=60]
126: JIT compiled List`1:Add(__Canon):this [Tier0, IL size=60, code size=124]
127: JIT compiled String:op_Inequality(String,String):bool [Tier0, IL size=11, code size=46]
128: JIT compiled String:Equals(String,String):bool [Tier0, IL size=36, code size=114]
129: JIT compiled ReadOnlySpan`1:GetPinnableReference():byref:this [Tier0, IL size=23, code size=57]
130: JIT compiled EventProvider:SetInformation(int,long,int):int:this [Tier0, IL size=38, code size=131]
131: JIT compiled ILStubClass:IL_STUB_PInvoke(long,int,long,int):int [FullOpts, IL size=62, code size=170]
132: JIT compiled Program:Main() [Tier0, IL size=11, code size=36]
133: JIT compiled Console:WriteLine(String) [Tier0, IL size=12, code size=59]
134: JIT compiled Console:get_Out():TextWriter [Tier0, IL size=20, code size=113]
135: JIT compiled Console:.cctor() [Tier0, IL size=11, code size=71]
136: JIT compiled Volatile:Read(byref):__Canon [Tier0, IL size=6, code size=21]
137: JIT compiled Console:<get_Out>g__EnsureInitialized|26_0():TextWriter [Tier0, IL size=63, code size=209]
138: JIT compiled ConsolePal:OpenStandardOutput():Stream [Tier0, IL size=34, code size=130]
139: JIT compiled Console:get_OutputEncoding():Encoding [Tier0, IL size=72, code size=237]
140: JIT compiled ConsolePal:get_OutputEncoding():Encoding [Tier0, IL size=11, code size=200]
141: JIT compiled NativeLibrary:LoadLibraryCallbackStub(String,Assembly,bool,int):long [Tier0, IL size=63, code size=280]
142: JIT compiled EncodingHelper:GetSupportedConsoleEncoding(int):Encoding [Tier0, IL size=53, code size=186]
143: JIT compiled Encoding:GetEncoding(int):Encoding [Tier0, IL size=340, code size=1025]
144: JIT compiled EncodingProvider:GetEncodingFromProvider(int):Encoding [Tier0, IL size=51, code size=232]
145: JIT compiled Encoding:FilterDisallowedEncodings(Encoding):Encoding [Tier0, IL size=29, code size=84]
146: JIT compiled LocalAppContextSwitches:get_EnableUnsafeUTF7Encoding():bool [Tier0, IL size=16, code size=46]
147: JIT compiled LocalAppContextSwitches:GetCachedSwitchValue(String,byref):bool [Tier0, IL size=22, code size=76]
148: JIT compiled LocalAppContextSwitches:GetCachedSwitchValueInternal(String,byref):bool [Tier0, IL size=46, code size=168]
149: JIT compiled LocalAppContextSwitches:GetSwitchDefaultValue(String):bool [Tier0, IL size=32, code size=98]
150: JIT compiled String:op_Equality(String,String):bool [Tier0, IL size=8, code size=39]
151: JIT compiled Encoding:get_Default():Encoding [Tier0, IL size=6, code size=49]
152: JIT compiled Encoding:.cctor() [Tier0, IL size=12, code size=73]
153: JIT compiled UTF8EncodingSealed:.ctor(bool):this [Tier0, IL size=8, code size=40]
154: JIT compiled UTF8Encoding:.ctor(bool):this [Tier0, IL size=14, code size=43]
155: JIT compiled UTF8Encoding:.ctor():this [Tier0, IL size=12, code size=36]
156: JIT compiled Encoding:.ctor(int):this [Tier0, IL size=42, code size=152]
157: JIT compiled UTF8Encoding:SetDefaultFallbacks():this [Tier0, IL size=64, code size=212]
158: JIT compiled EncoderReplacementFallback:.ctor(String):this [Tier0, IL size=110, code size=360]
159: JIT compiled EncoderFallback:.ctor():this [Tier0, IL size=7, code size=31]
160: JIT compiled String:get_Chars(int):ushort:this [Tier0, IL size=29, code size=61]
161: JIT compiled Char:IsSurrogate(ushort):bool [Tier0, IL size=17, code size=43]
162: JIT compiled Char:IsBetween(ushort,ushort,ushort):bool [Tier0, IL size=12, code size=52]
163: JIT compiled DecoderReplacementFallback:.ctor(String):this [Tier0, IL size=110, code size=360]
164: JIT compiled DecoderFallback:.ctor():this [Tier0, IL size=7, code size=31]
165: JIT compiled Encoding:get_CodePage():int:this [Tier0, IL size=7, code size=17]
166: JIT compiled Encoding:get_UTF8():Encoding [Tier0, IL size=6, code size=49]
167: JIT compiled UTF8Encoding:.cctor() [Tier0, IL size=12, code size=76]
168: JIT compiled Volatile:Write(byref,__Canon) [Tier0, IL size=6, code size=32]
169: JIT compiled ConsolePal:GetStandardFile(int,int,bool):Stream [Tier0, IL size=50, code size=183]
170: JIT compiled ConsolePal:get_InvalidHandleValue():long [Tier0, IL size=7, code size=41]
171: JIT compiled IntPtr:.ctor(int):this [Tier0, IL size=9, code size=25]
172: JIT compiled ConsolePal:ConsoleHandleIsWritable(long):bool [Tier0, IL size=26, code size=68]
173: JIT compiled Kernel32:WriteFile(long,long,int,byref,long):int [Tier0, IL size=46, code size=294]
174: JIT compiled Marshal:SetLastSystemError(int) [Tier0, IL size=7, code size=40]
175: JIT compiled Marshal:GetLastSystemError():int [Tier0, IL size=6, code size=34]
176: JIT compiled WindowsConsoleStream:.ctor(long,int,bool):this [Tier0, IL size=37, code size=90]
177: JIT compiled ConsoleStream:.ctor(int):this [Tier0, IL size=31, code size=71]
178: JIT compiled Stream:.ctor():this [Tier0, IL size=7, code size=31]
179: JIT compiled MarshalByRefObject:.ctor():this [Tier0, IL size=7, code size=31]
180: JIT compiled Kernel32:GetFileType(long):int [Tier0, IL size=27, code size=217]
181: JIT compiled Console:CreateOutputWriter(Stream):TextWriter [Tier0, IL size=50, code size=230]
182: JIT compiled Stream:.cctor() [Tier0, IL size=11, code size=71]
183: JIT compiled NullStream:.ctor():this [Tier0, IL size=7, code size=31]
184: JIT compiled EncodingExtensions:RemovePreamble(Encoding):Encoding [Tier0, IL size=25, code size=118]
185: JIT compiled UTF8EncodingSealed:get_Preamble():ReadOnlySpan`1:this [Tier0, IL size=24, code size=99]
186: JIT compiled UTF8Encoding:get_PreambleSpan():ReadOnlySpan`1 [Tier0, IL size=12, code size=87]
187: JIT compiled ConsoleEncoding:.ctor(Encoding):this [Tier0, IL size=14, code size=52]
188: JIT compiled Encoding:.ctor():this [Tier0, IL size=8, code size=33]
189: JIT compiled Encoding:SetDefaultFallbacks():this [Tier0, IL size=23, code size=65]
190: JIT compiled EncoderFallback:get_ReplacementFallback():EncoderFallback [Tier0, IL size=6, code size=49]
191: JIT compiled EncoderReplacementFallback:.cctor() [Tier0, IL size=11, code size=71]
192: JIT compiled EncoderReplacementFallback:.ctor():this [Tier0, IL size=12, code size=44]
193: JIT compiled DecoderFallback:get_ReplacementFallback():DecoderFallback [Tier0, IL size=6, code size=49]
194: JIT compiled DecoderReplacementFallback:.cctor() [Tier0, IL size=11, code size=71]
195: JIT compiled DecoderReplacementFallback:.ctor():this [Tier0, IL size=12, code size=44]
196: JIT compiled StreamWriter:.ctor(Stream,Encoding,int,bool):this [Tier0, IL size=201, code size=564]
197: JIT compiled Task:get_CompletedTask():Task [Tier0, IL size=6, code size=49]
198: JIT compiled Task:.cctor() [Tier0, IL size=76, code size=316]
199: JIT compiled TaskFactory:.ctor():this [Tier0, IL size=7, code size=31]
200: JIT compiled Task`1:.ctor(bool,VoidTaskResult,int,CancellationToken):this [Tier0, IL size=21, code size=75]
201: JIT compiled Task:.ctor(bool,int,CancellationToken):this [Tier0, IL size=70, code size=181]
202: JIT compiled <>c:.cctor() [Tier0, IL size=11, code size=71]
203: JIT compiled <>c:.ctor():this [Tier0, IL size=7, code size=31]
204: JIT compiled TextWriter:.ctor(IFormatProvider):this [Tier0, IL size=36, code size=124]
205: JIT compiled TextWriter:.cctor() [Tier0, IL size=26, code size=108]
206: JIT compiled NullTextWriter:.ctor():this [Tier0, IL size=7, code size=31]
207: JIT compiled TextWriter:.ctor():this [Tier0, IL size=29, code size=103]
208: JIT compiled String:ToCharArray():ref:this [Tier0, IL size=52, code size=173]
209: JIT compiled MemoryMarshal:GetArrayDataReference(ref):byref [Tier0, IL size=7, code size=24]
210: JIT compiled ConsoleStream:get_CanWrite():bool:this [Tier0, IL size=7, code size=18]
211: JIT compiled ConsoleEncoding:GetEncoder():Encoder:this [Tier0, IL size=12, code size=57]
212: JIT compiled UTF8Encoding:GetEncoder():Encoder:this [Tier0, IL size=7, code size=63]
213: JIT compiled EncoderNLS:.ctor(Encoding):this [Tier0, IL size=37, code size=102]
214: JIT compiled Encoder:.ctor():this [Tier0, IL size=7, code size=31]
215: JIT compiled Encoding:get_EncoderFallback():EncoderFallback:this [Tier0, IL size=7, code size=18]
216: JIT compiled EncoderNLS:Reset():this [Tier0, IL size=24, code size=92]
217: JIT compiled ConsoleStream:get_CanSeek():bool:this [Tier0, IL size=2, code size=12]
218: JIT compiled StreamWriter:set_AutoFlush(bool):this [Tier0, IL size=25, code size=72]
219: JIT compiled StreamWriter:CheckAsyncTaskInProgress():this [Tier0, IL size=19, code size=47]
220: JIT compiled Task:get_IsCompleted():bool:this [Tier0, IL size=16, code size=40]
221: JIT compiled Task:IsCompletedMethod(int):bool [Tier0, IL size=11, code size=25]
222: JIT compiled StreamWriter:Flush(bool,bool):this [Tier0, IL size=272, code size=1127]
223: JIT compiled StreamWriter:ThrowIfDisposed():this [Tier0, IL size=15, code size=43]
224: JIT compiled Encoding:get_Preamble():ReadOnlySpan`1:this [Tier0, IL size=12, code size=70]
225: JIT compiled ConsoleEncoding:GetPreamble():ref:this [Tier0, IL size=6, code size=27]
226: JIT compiled Array:Empty():ref [Tier0, IL size=6, code size=49]
227: JIT compiled EmptyArray`1:.cctor() [Tier0, IL size=12, code size=52]
228: JIT compiled ReadOnlySpan`1:op_Implicit(ref):ReadOnlySpan`1 [Tier0, IL size=7, code size=79]
229: JIT compiled ReadOnlySpan`1:.ctor(ref):this [Tier0, IL size=33, code size=81]
230: JIT compiled MemoryMarshal:GetArrayDataReference(ref):byref [Tier0, IL size=7, code size=24]
231: JIT compiled ConsoleEncoding:GetMaxByteCount(int):int:this [Tier0, IL size=13, code size=63]
232: JIT compiled UTF8EncodingSealed:GetMaxByteCount(int):int:this [Tier0, IL size=20, code size=50]
233: JIT compiled Span`1:.ctor(long,int):this [Tier0, IL size=51, code size=115]
234: JIT compiled ReadOnlySpan`1:.ctor(ref,int,int):this [Tier0, IL size=65, code size=147]
235: JIT compiled Encoder:GetBytes(ReadOnlySpan`1,Span`1,bool):int:this [Tier0, IL size=44, code size=234]
236: JIT compiled MemoryMarshal:GetNonNullPinnableReference(ReadOnlySpan`1):byref [Tier0, IL size=30, code size=54]
237: JIT compiled ReadOnlySpan`1:get_Length():int:this [Tier0, IL size=7, code size=17]
238: JIT compiled MemoryMarshal:GetNonNullPinnableReference(Span`1):byref [Tier0, IL size=30, code size=54]
239: JIT compiled Span`1:get_Length():int:this [Tier0, IL size=7, code size=17]
240: JIT compiled EncoderNLS:GetBytes(long,int,long,int,bool):int:this [Tier0, IL size=92, code size=279]
241: JIT compiled ArgumentNullException:ThrowIfNull(long,String) [Tier0, IL size=12, code size=45]
242: JIT compiled Encoding:GetBytes(long,int,long,int,EncoderNLS):int:this [Tier0, IL size=57, code size=187]
243: JIT compiled EncoderNLS:get_HasLeftoverData():bool:this [Tier0, IL size=35, code size=105]
244: JIT compiled UTF8Encoding:GetBytesFast(long,int,long,int,byref):int:this [Tier0, IL size=33, code size=119]
245: JIT compiled Utf8Utility:TranscodeToUtf8(long,int,long,int,byref,byref):int [Tier0, IL size=1446, code size=3208]
246: JIT compiled Math:Min(int,int):int [Tier0, IL size=8, code size=28]
247: JIT compiled ASCIIUtility:NarrowUtf16ToAscii(long,long,long):long [Tier0, IL size=490, code size=1187]
248: JIT compiled WindowsConsoleStream:Flush():this [Tier0, IL size=26, code size=56]
249: JIT compiled ConsoleStream:Flush():this [Tier0, IL size=1, code size=10]
250: JIT compiled TextWriter:Synchronized(TextWriter):TextWriter [Tier0, IL size=28, code size=121]
251: JIT compiled SyncTextWriter:.ctor(TextWriter):this [Tier0, IL size=14, code size=52]
252: JIT compiled SyncTextWriter:WriteLine(String):this [Tier0, IL size=13, code size=140]
253: JIT compiled StreamWriter:WriteLine(String):this [Tier0, IL size=20, code size=110]
254: JIT compiled String:op_Implicit(String):ReadOnlySpan`1 [Tier0, IL size=31, code size=171]
255: JIT compiled String:GetRawStringData():byref:this [Tier0, IL size=7, code size=24]
256: JIT compiled ReadOnlySpan`1:.ctor(byref,int):this [Tier0, IL size=15, code size=39]
257: JIT compiled StreamWriter:WriteSpan(ReadOnlySpan`1,bool):this [Tier0, IL size=368, code size=1036]
258: JIT compiled MemoryMarshal:GetReference(ReadOnlySpan`1):byref [Tier0, IL size=8, code size=17]
259: JIT compiled Buffer:MemoryCopy(long,long,long,long) [Tier0, IL size=21, code size=83]
260: JIT compiled Unsafe:ReadUnaligned(long):long [Tier0, IL size=10, code size=17]
261: JIT compiled ASCIIUtility:AllCharsInUInt64AreAscii(long):bool [Tier0, IL size=16, code size=38]
262: JIT compiled ASCIIUtility:NarrowFourUtf16CharsToAsciiAndWriteToBuffer(byref,long) [Tier0, IL size=107, code size=171]
263: JIT compiled Unsafe:WriteUnaligned(byref,int) [Tier0, IL size=11, code size=22]
264: JIT compiled Unsafe:ReadUnaligned(long):int [Tier0, IL size=10, code size=16]
265: JIT compiled ASCIIUtility:AllCharsInUInt32AreAscii(int):bool [Tier0, IL size=11, code size=25]
266: JIT compiled ASCIIUtility:NarrowTwoUtf16CharsToAsciiAndWriteToBuffer(byref,int) [Tier0, IL size=24, code size=35]
267: JIT compiled Span`1:Slice(int,int):Span`1:this [Tier0, IL size=39, code size=135]
268: JIT compiled Span`1:.ctor(byref,int):this [Tier0, IL size=15, code size=39]
269: JIT compiled Span`1:op_Implicit(Span`1):ReadOnlySpan`1 [Tier0, IL size=19, code size=90]
270: JIT compiled ReadOnlySpan`1:.ctor(byref,int):this [Tier0, IL size=15, code size=39]
271: JIT compiled WindowsConsoleStream:Write(ReadOnlySpan`1):this [Tier0, IL size=35, code size=149]
272: JIT compiled WindowsConsoleStream:WriteFileNative(long,ReadOnlySpan`1,bool):int [Tier0, IL size=107, code size=272]
273: JIT compiled ReadOnlySpan`1:get_IsEmpty():bool:this [Tier0, IL size=10, code size=24]
Hello, world!
274: JIT compiled AppContext:OnProcessExit() [Tier0, IL size=43, code size=161]
275: JIT compiled AssemblyLoadContext:OnProcessExit() [Tier0, IL size=101, code size=442]
276: JIT compiled EventListener:DisposeOnShutdown() [Tier0, IL size=150, code size=618]
277: JIT compiled List`1:.ctor():this [Tier0, IL size=18, code size=133]
278: JIT compiled List`1:.cctor() [Tier0, IL size=12, code size=129]
279: JIT compiled List`1:GetEnumerator():Enumerator:this [Tier0, IL size=7, code size=162]
280: JIT compiled Enumerator:.ctor(List`1):this [Tier0, IL size=39, code size=64]
281: JIT compiled Enumerator:MoveNext():bool:this [Tier0, IL size=81, code size=159]
282: JIT compiled Enumerator:get_Current():__Canon:this [Tier0, IL size=7, code size=22]
283: JIT compiled WeakReference`1:TryGetTarget(byref):bool:this [Tier0, IL size=24, code size=66]
284: JIT compiled List`1:AddWithResize(__Canon):this [Tier0, IL size=39, code size=85]
285: JIT compiled List`1:Grow(int):this [Tier0, IL size=53, code size=121]
286: JIT compiled List`1:set_Capacity(int):this [Tier0, IL size=86, code size=342]
287: JIT compiled CastHelpers:StelemRef_Helper(byref,long,Object) [Tier0, IL size=34, code size=104]
288: JIT compiled CastHelpers:StelemRef_Helper_NoCacheLookup(byref,long,Object) [Tier0, IL size=26, code size=111]
289: JIT compiled Enumerator:MoveNextRare():bool:this [Tier0, IL size=57, code size=80]
290: JIT compiled Enumerator:Dispose():this [Tier0, IL size=1, code size=14]
291: JIT compiled EventSource:Dispose():this [Tier0, IL size=14, code size=54]
292: JIT compiled EventSource:Dispose(bool):this [Tier0, IL size=124, code size=236]
293: JIT compiled EventProvider:Dispose():this [Tier0, IL size=14, code size=54]
294: JIT compiled EventProvider:Dispose(bool):this [Tier0, IL size=90, code size=230]
295: JIT compiled EventProvider:EventUnregister(long):this [Tier0, IL size=14, code size=50]
296: JIT compiled EtwEventProvider:System.Diagnostics.Tracing.IEventProvider.EventUnregister(long):int:this [Tier0, IL size=7, code size=181]
297: JIT compiled GC:SuppressFinalize(Object) [Tier0, IL size=18, code size=53]
298: JIT compiled EventPipeEventProvider:System.Diagnostics.Tracing.IEventProvider.EventUnregister(long):int:this [Tier0, IL size=13, code size=187]现在,让我们继续讨论实际的性能改进,从on-stack replacement(栈上替换)开始.
因JIT部分内容太多,这里进行拆分,OSR拆分为一篇博文.
秋风
2022-09-06