Profiling

Hubert Hesse

Software Profiling Seminar 2013

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What is Android?

• First Developed by Android, Inc., since 2005 part of Google

• JAVA because of support of Tool Support and Open Source Activity [Bornstein2008]

• First Android phone was sold in October 2008 HTC Dream (aka G1)

iPhone 06/2007

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Latest Addition: Tablets

• With release of Nexus 7 2012 upsurge in tablet market

• Android 4 – Design Guidelines

iPad 04/2010

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Dalvik Executable

• Convert java .class files into .dex format • dx: Java Bytecode -> an alternative instruction

set compatible with Dalvik VM.

Write an Android Applications in any language that compile to .class

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Dal

vik

VM In

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als D

an B

orns

tein

(Goo

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gle

I/O

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tps:

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m/s

ite/io

/dal

vik-

vm-in

tern

als/

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Why Profiling? • When apps don’t perform as expected or

advertised, 99% of respondents said they would take action: [Apigee2012]

Delete immediately

33%

Delete if it freeze > 30s

28%

Tell my peers how bad it is

24%

Complain on social media

15%

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Example: Google I/O App 2012

• (https://code.google.com/p/iosched/)

Default state today After network/API? limit 7

Google I/O App 2012

• Do you notice the difference?

≈ 5% CPU ≈ 80% CPU 8

Overview Profiling

From System profiling to UI Profiling: On the device

Dalvik Debug Monitor

Static analysis

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Eclipse Android Monitor

Standalone

On the device (Developer options)

Monitoring>Show CPU usage Drawing>Show Layout bounds 10

Developer options II

Drawing>Show GPU view updates Drawing>Show GPU overdrawn 11

Overview Profiling

• Dalvik Debug Monitor Server (DDMS) • Running multiple Debugger Monitor sessions

through an USB cable?

DDMS

On the device

Static analysis 12

Remote Java Profiling Client Device

adb adbd TCP/IP over USB Cable

DDMS JDWP Android Runtime

Application Framework

App1 App2 Debugger Eclipse

Screengrab ...

vendor-defined packets

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Debugger Port: 8600

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System View: Idle CPU usage ≈ 20%

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System View: Idle CPU usage ≈ 99%

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OpenGL Profiling

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Thread View: utime: user time stime: system time

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Method Profiling

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Demo

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Annotate with Start/stopmethodprofiling

Debug.startMethodTracing(“file"); // start tracing to “/mnt/sdcard/file.trace" // ... // stop tracing Debug.stopMethodTracing();

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REMOVE Menu BAR

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Fix?

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Snapshot (forces GC) Tracking over Time (start, stop, force GC) Convert to heap to Eclipse MAT compatible format (with hprof-conv)

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Network l/O Emulator Control Telephony Status - network status (home, roaming, searching), and speed and latency (GPRS, EDGE, UTMS, HSDPA). Telephony Actions - Mock calls and SMS Location Controls – Mock location

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System Profiling with systrace.py

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Bug in DDMS/Eclipse version. $ python systrace.py --set-tags=gfx,view,wm $ adb shell stop $ adb shell start $ python systrace.py --cpu-freq --cpu-load --time=10 -o mytracefile.html Demo

Hierachy viewer standalone tool

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Relative Measure, Layout, Draw Performance

Screen appearance

Absolute Measure, Layout, Draw Performance

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Overview Profiling

From System profiling to UI Profiling:

Static analysis

On the device

DDMS

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LINT Static Code Analysis

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Thank you.

Questions?

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REFERENCES

• [Apigee2012], http://apigee.com/about/pressrelease/apigee-survey-users-reveal-top-frustrations-lead-bad-mobile-app-reviews

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