Application Quality Overview-Application Quality Overview

Design for eXcellence (DFX) is a general term for non-functional design of a product. X indicates a feature of the product or a phase in the product lifecycle. The HarmonyOS DFX subsystem provides a series of DFX functions to help you create high-quality apps and games. These functions include:

Design for Reliability (DFR): detects and rectifies faults such as app crashes and freezes, resource leak, and address sanitizer.
Design for Testability (DFT): provides logs, tracing, debugging information, and command line tools to support app observation and debugging.
Design for Performance (DFP): detects performance issues such as slow startup, frame freezing, and frame loss of the app, and provides analysis tools such as HiTrace and HiPerf to help you optimize app performance.

These DFX functions cover multiple aspects such as fault management, problem reporting, and problem analysis. The following table lists specific capabilities.

Basic Capabilities

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Scenario	Sub-scenario	Component or Tool
Fault management	Stability detection	Crash Detection
		Resource Leak Detection
		Application Freeze Detection
		Address Sanitizer Detection
		Task Timeout Detection
	Performance detection	Performance Detection
	Power consumption detection	Power Consumption Detection
	Error management	errorManager (error management component)
	Fault restoration	appRecovery (app recovery component)
Problem reporting	Event subscription	HiAppEvent (event recording component)
Problem analysis	Logs	HiLog (log printing component)
	Tracing	HiTraceMeter (process trading component)
	Tracing	HiTraceChain (distributed call chain tracing component)
	Debugging information	HiDebug (debugging information obtaining component)
	Command line tools	hdc (command line tool for debugging connectors)
		hilog (HiLog command line tool)
		hilogtool (HiLog log parsing tool)
		HiDumper (system information export tool)
		HiTrace (HiTraceMeter command line tool)
		hiperf (performance data capture tool)
		More
	UI-based tools	SmartPerf (performance and power consumption tuning tool), DevEco Studio (integrated development environment for HarmonyOS apps)

Scenario-based Knowledge Map

During development and O&M, if encountering issues related to stability, performance, and power consumption, you can refer to the following scenario-based knowledge map for analysis and resolution.

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Scenario	Level-2 Scenario	Development-state Detection	Runtime-state Detection	Analysis Method	Case
Stability	Address sanitizer	ASan: Detecting Memory Errors HWASan: Detecting Memory Errors		Typical Out-of-Bounds Access Issues
	Resource leak	Development-State Resource Leak Detection		Analyzing Memory Leaks Handle Leak Analysis Methods Analyzing Thread Leaks
	App freeze	-	APP_INPUT_BLOCK User Input Response Timeout
	Abnormal app exit	UBSan: Detecting Undefined Behavior	JS Crash (Process Crash) Detection C++ Crash (Process Crash) Detection Detecting Application Kill Events
Performance	Slow app startup		Detecting Startup Duration Issues Detecting Main Thread Jank Issues	-	-
Performance	App freezing and frame loss		Detecting Frame Loss During Scrolling	Analyzing Touch Response Latency of Web Pages Analyzing Loading Completion Latency of Web Pages Analyzing Time-Consuming Issues in Cross-Thread Serialization Memory Basics and Optimization	Optimizing Web Loading Performance Optimizing Frame Loss for Long List Loading Optimizing Frame Loss for Waterfall Loading More
Power consumption	Abnormal app power consumption	HiSmartPerf Power Consumption Detection Profiler Power Consumption Detection	Power Consumption Detection in Running State	High CPU Load Analysis Analysis of Invisible Foreground Animation Issues	Vsync Low-power Optimization Buffer Low-power Optimization

In addition to the development-state detection methods listed in the preceding table, you can also use DevEco Testing to test the app quality.

Common Terms

The following table lists some common terms related to app quality. For more terms, see Performance Analysis Kit Terminology.

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Scenario	Common Term
General	Log version, nolog version, debug version, release version
Stability	CPP crash, JS crash, AppFreeze, ASan, HWASan, GWP-ASan, TSan, UBSan
Performance	Frame loss
Power consumption	Foreground task, background task, frame rate, Low Temperature Polycrystalline Oxide (LTPO), redundant drawing, invisible animation, Hardware Composer (HWC)
Memory	Virtual Set Size (VSS), Proportional Set Size (PSS), Resident Set Size (RSS), dirty page, clean page, anonymous page, file-backed page

Application Quality Overview

Basic Capabilities

Scenario-based Knowledge Map

Common Terms

Related Topics