Profiling using Signpost

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P R O F I L I N G U S I N G S I G N P O S T T O S H I H I R O S U Z U K I

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T O S H I 0 3 8 3

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A G E N D A • Signpost • Custom Instruments

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S I G N P O S T

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I N T R O D U C E D I N W W D C 2 0 1 8

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L O G G I N G A P I • 2016: *LOG => OSLOG • 2018: SIGNPOST

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W W D C 2 0 1 8

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I N S T R U M E N T S

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S I G N P O S T

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I N T E R VA L

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P O I N T S O F I N T E R E S T

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P O I N T S O F I N T E R E S T

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No content

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W W D C 2 0 1 8

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H O W I T ’ S L I G H T W E I G H T 1 / 2 W W D C 2 0 1 8 [Logging Optimization] String construction is delayed until observation.

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H O W I T ’ S L I G H T W E I G H T 2 / 2 [Observer Optimization] Opt-out immediate mode

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O N LY D U R I N G O B S E R VAT I O N W W D C 2 0 1 8

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D I S A B L I N G S C E N A R I O W W D C 2 0 1 8

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C A S E S T U D Y

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B E F O R E

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A F T E R https://github.com/toshi0383/Bitrise-iOS/pull/51

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D E FA U LT T R A C E V I E W Annoying per `name`

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C U S T O M I N S T R U M E N T S

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C U S T O M I N S T R U M E N T S • Establish common debug workflow of your team

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* . I N S T R P K G • xml + CLIPS lang • Instruments Developer Help

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C R E AT I N G C U S T O M I N S T R U M E N T S W W D C 2 0 1 8

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D U P L I C AT E D R E Q U E S T D E T E C T I O N W W D C 2 0 1 8

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A D VA N C E D S C R I P T I N G P O W E R E D B Y. .

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B U G ?

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S U M M A RY • Signpost can visualize your App’s Performance • Even better visualization with Custom Instruments

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T I P S

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W W D C 2 0 1 6

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W R I T I N G W R A P P E R ⚠ It would cost you array construction and method dispatching. ⚠

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I N T E G R AT E W I T H R X I F Y O U H A P P I LY PAY A R R AY C O N S T R U C T I O N C O S T. .

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T I P S • Sign with Development Certificate • Use immediate mode only for debug level profiling • No sample codes available from Apple.  Watch wwdc session to grep source-code  OR refer to https://github.com/toshi0383/Bitrise-iOS

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E N A B L E I N P R O D U C T I O N ? • “Always enable to avoid execution timing problems.” • Less than 1ms for 10000 times `os_log(.error)` outputs without observing.

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I N S TA L L I N G C U S T O M I N S T R U M E N T S • https://qiita.com/toshi0383/items/ ec14467869e25d1b5d13

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WAT C H V I D E O S F O R M O R E I N F O • Fix Bugs Faster using Activity Tracing: WWDC 2014 • Unified Logging and Activity Tracing: WWDC 2016 • Measuring Performance Using Logging: WWDC 2018