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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
TinyCLR.it
