What s New in Energy Debugging

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1 #WWDC18 What s New in Energy Debugging Phillip Azar, Apple/Battery Life David Choi, Apple/Battery Life 2018 Apple Inc. All rights reserved. Redistribution or public display not permitted without written permission from Apple.

4 Review general battery life concepts Review tools for energy debugging New features for energy debugging

5 Review general battery life concepts Review tools for energy debugging New features for energy debugging

6 What Is Energy?

7 What Is Energy? Power X Time

8 What Is Energy? Power Time

9 What Is Energy? Power Energy Time

10 What Is Energy? Power Energy Time

11 What Is Energy? App Active App Active Power Energy Time

12 What Is Energy? App Active App Active Power App Idle App Idle Energy Time

13 What Is Energy? App Active App Active Power App Idle App Idle App Suspended Energy Time

14 What Is Energy? Overhead Power Overhead Overhead Time

15 What Is Energy? App Active Your work App Active Power Time

16 What Is Energy? App Active Your work Overhead App Active Power Overhead Overhead Time

17 What Consumes Energy?

18 What Consumes Energy? Processing Networking Location Graphics

20 Processing

21 Processing The work horse

22 Processing The work horse Workload-dependent

23 Processing The work horse Workload-dependent More operations by your app = more energy

25 Networking

26 Networking Cellular, Wi-Fi, Bluetooth

27 Networking Cellular, Wi-Fi, Bluetooth Traffic-dependent

28 Networking Cellular, Wi-Fi, Bluetooth Traffic-dependent More network requests = more energy

30 Location

31 Location GPS, WiFi, Cellular

32 Location GPS, WiFi, Cellular Accuracy, frequency-dependent

33 Location GPS, WiFi, Cellular Accuracy, frequency-dependent More time spent tracking location = more energy

35 Graphics

36 Graphics Animations and UI

37 Graphics Animations and UI Complexity-dependent

38 Graphics Animations and UI Complexity-dependent More rendering = more energy

39 Processing Networking Location Graphics

40 Processing Networking Location Graphics More work = More energy

41 How Do We Optimize Energy Consumption?

42 Foreground

43 Foreground

44 Foreground Focus on providing value to the user

45 Foreground Focus on providing value to the user Do required work only

46 Example Media app feed

47 Example Media app feed Timer based feed refresh

48 Example Media app feed Timer based feed refresh

49 Feed Refresh Overhead Power Timer Timer Timer Time

50 Example Media app feed Timer based feed refresh

51 Example Media app feed Timer based feed refresh Feed refresh on demand Notification User interaction

52 Example Media app feed Timer based feed refresh Feed refresh on demand Notification User interaction

53 Feed Refresh Overhead Power User Interaction Notification Time

54 Foreground Focus on providing value to the user Do work when requested

55 Foreground Focus on providing value to the user Do work when requested Minimize complex UI

56 Example Video player app

57 Example Video player app

58 Example Video player app Persistent UI controls

59 Example Video player app Persistent UI controls

60 Example Video player app Persistent UI controls

61 Example Video player app Persistent UI controls Auto dismissed UI controls No user interaction Timeout based

62 Example Video player app Persistent UI controls Auto dismissed UI controls No user interaction Timeout based

63 Background

64 Background

65 Background Focus on minimizing workload

66 Background Focus on minimizing workload Coalesce tasks

67 Example App analytics

68 Example App analytics Sending immediately

69 Example App analytics Sending immediately

70 Analytics Overhead Power Background Background Background Time

71 Example App analytics Sending immediately

72 Example App analytics Sending immediately Sending deferred batches

73 Example App analytics Sending immediately Sending deferred batches

74 Analytics Overhead Power Background Time

75 Background Focus on minimizing workload Coalesce tasks

76 Background Focus on minimizing workload Coalesce tasks End tasks quickly

77 Example Background modes

78 Example Background modes Lettings tasks expire

79 Example Background modes Lettings tasks expire

80 Background Work Overhead Task Started Power Suspended Time

81 Example Background modes Lettings tasks expire

82 Example Background modes Lettings tasks expire Calling completion handlers UIBackgroundTask VoIP Etc

83 Example Background modes Lettings tasks expire Calling completion handlers UIBackgroundTask VoIP Etc

84 Background Work Overhead Task Started Completion Handler Power Time

85 Processing Networking Location Graphics

86 Processing Networking Location Graphics

87 Review general battery life concepts Review tools for energy debugging New features for energy debugging

88 Tools for Energy Debugging

89 Tools for Energy Debugging Energy Gauges

90 Tools for Energy Debugging Energy Gauges

91 Energy Gauges

100 Energy Gauges Are Great for

101 Energy Gauges Are Great for High level energy characterization Rapid profiling

102

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106 Time Profiler

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115 Other Profiling Templates and Instruments

116 Other Profiling Templates and Instruments Energy diagnostics profiling template Activity monitor profiling template Core animation profiling template GPU driver profiling template Location energy instrument Network profiling template

117 Instruments Are Great for

118 Instruments Are Great for Root cause analysis In depth profiling

119 Instruments Are Great for Root cause analysis In depth profiling Untethered profiling

120 Working Demo Energy Debugging

121 Working Demo Takeaways Energy Gauges for rapid iteration Instruments for root cause analysis Make energy a top priority

122 You ve shipped your app. Whats next?

123 NEW Review general battery life concepts Review tools for energy debugging New features for energy debugging

124 New Features for Energy Debugging David Choi, Battery Life

125 Now that You ve Shipped Your App How do you know if your customers are experiencing energy issues? How do you debug a customer energy issue?

126 A New Way of Debugging Energy Issues NEW Xcode Energy Logs Xcode Energy Organizer

127 Xcode Energy Logs NEW Reports high CPU energy events Points out energy hotspots in code Data from TestFlight and App Store

128 When Are Xcode Energy Logs Generated? NEW CPU % 80% High CPU Energy Events 80% CPU spin over 3 minutes in foreground Time 80% CPU spin over 1 minutes in background

129 When Are Xcode Energy Logs Generated? NEW CPU % 80% High CPU Energy Events 80% CPU spin over 3 minutes in foreground Time 80% CPU spin over 1 minutes in background Xcode Energy Log

130 Xcode Energy Logs: Impact on User Battery Life Up to 1% battery drop

131 Xcode Energy Logs: Impact on User Battery Life Up to 1% battery drop 8 minutes of talk time 6 minutes of browsing 30 minutes of music

132 What s in an Energy Log? Energy condition that triggered the report Device type and app build number Weighted call graph that shows energy hotspots

133 Xcode Energy Log: Weighted Call Graph

134 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3()

135 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3()

136 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() High CPU Energy Event detected!

137 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3()

138 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3()

139 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() main() method1() method2()

140 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() main() main() method1() method3() method2() method4()

141 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() main() main() main() method1() method3() method1() method2() method4()

142 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() main() main() main() main() method1() method3() method1() method1() method2() method4() method2()

143 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() main() main() main() main() main() method1() method3() method1() method1() method1() method2() method4() method2() method2()

144 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() main() main() main() main() main() main() method1() method3() method1() method1() method1() method1() method2() method4() method2() method2() method3()

145 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() main() main() main() main() main() main() method1() method3() method1() method1() method1() method1() method2() method4() method2() method2() method3()

146 Xcode Energy Log: Weighted Call Graph main() method1() method3() method1() method2() method4() method2() method3() 6 main() 5 method1() main() main() 3 method2() method1() method1() method3() 1 method3() method3() method2() method4() 1 method3() 1 method4()

147 Weighted Call Graph Collection of backtrace samples Aggregated by sample counts More samples mean heavily executed code 6 main() 5 method1() 3 method2() 1 method3() 1 method3() 1 method4()

148 How to Access Energy Logs?

149 Xcode Energy Organizer NEW

150 Xcode Energy Organizer NEW Test Flight and App Store ios apps

151 Xcode Energy Organizer NEW Test Flight and App Store ios apps Recent statistics

152 Xcode Energy Organizer NEW Test Flight and App Store ios apps Recent statistics List of top issues

153 Xcode Energy Organizer NEW Test Flight and App Store ios apps Recent statistics List of top issues Weighted call graph

154 Xcode Energy Organizer NEW Test Flight and App Store ios apps Recent statistics List of top issues Weighted call graph Page through logs

155 Xcode Energy Organizer NEW Test Flight and App Store ios apps Recent statistics List of top issues Weighted call graph Page through logs Open in Project

156 Demo Xcode Energy Organizer

157 Energy Organizer Demo takeaways Discover top energy issues from the field View energy hotspots with weighted call graphs Open in Project to debug code

158 Summary Think about energy use in design Use energy gauges and instruments Explore the new Xcode Energy Organizer

159 More Information Power and Performance Lab Technology Lab 9 Friday 9:00AM

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Writing Energy Efficient Apps

Session App Frameworks #WWDC17 Writing Energy Efficient Apps 238 Daniel Schucker, Software Power Engineer Prajakta Karandikar, Software Power Engineer 2017 Apple Inc. All rights reserved. Redistribution