Debugging Performance Issues Using Visual Studio

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DebuggingPerformanceIssues UsingVisualStudio

MircoVaniniMicrosoft®MVPWindowsDevelopmentAllSeenAlliance- AllJoyn®AmbassadorOpenConnectivityFoundation- OCF®Ambassador

Why is performanceimportant?Continuously evaluate performanceduring normaldebugging

PerfTipsMemorytoolCPUgraph

Drill into thedetails ofaperformanceissueTimeline toolCPUtoolStandalone Profiler

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Agenda

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Why is performanceimportant?

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AppFreezes Crashes SlowResponsiveness HeavyBatteryUsage

Reasonsforbadreviews

Theability tomonitorperformancewhile debugging,andcorrelateperformancedatawithdebugging activity

Amuch richer andmoreuseful experience forIntelliTrace andtheOutputwindow,dramaticallyshortening thetimeit takesyou todiagnose anissue orverify afix.

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WhatareDiagnosticTools?

Demo

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PerfTips(tooltips with performanceinformation)

IndicatinghowlongtheprogramwasrunningduringtheprevioussteporsincethelastbreakpointQuickly measure timebetween breaksExcludes majordebugger related overhead• Timestopped underthedebugger (e.g.stopped at abreakpoint)• Symbol loadingBestsuited fororder ofmagnitude measurements• Greatest accuracy onCLR4.6andWindows10

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PerfTips

ShowsCPUutilization across all available coresSpikes canbeinteresting,even if less than 100%Available after debugging sessionhas stopped

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CPUgraph

Thegarbagecollectorservesasanautomaticmemorymanager• Enables you todevelop your application without having tofreememory• Allocates objects onthemanaged heap efficiently• Reclaims objects that arenolonger being used,clears theirmemory,andkeeps thememory available forfutureallocations.Managed objects automatically get cleancontent tostartwith,sotheir constructors donot have toinitialize every datafield• Provides memory safety bymaking sure that anobjectcannot usethecontent ofanother object

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FundamentalsofGarbageCollection

Threecommoncausesofmemoryleaksinmanagedapplications• Holdingreferencestomanagedobjects• Failingtoreleaseunmanagedresources• FailingtodisposeDrawingobjects

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CommonCauses ofMemoryLeaks in.NET

Demo

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MemoryTool

Comparememory consumption overtime• Provides sizes andcount foreach type• Filters outobjects marked forgarbage collection (.NET)Worksforboth C++and.NETapps

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Memorytool

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Performanceprofile

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Performancewizard

Demo

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Timeline Tool

Identify app performanceissues dueto• Parsing &Layout• Applicationcodeorother runtime CPUconsumptionMonitorFPSthroughput

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Timeline tool

Records which functions areusing theCPUthemost• Takes acallstack fromtheCPUevery millisecond• ShowsaggregatereportCollects mixed modestacks (.NET&C++)

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CPUtool

PartofVisualStudioRemotetoolsCPUsampling onWindows8+works withx-copyhttps://www.visualstudio.com/downloads/

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Standalone Profiler

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Who Iam

[email protected]@MircoVanini

MircoVaniniMicrosoft®MVPWindowsDevelopmentAllSeen Alliance- AllJoyn®AmbassadorOpenConnectivityFoundation- OCF®Ambassador

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