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ART of Q 2019-05-21 (mixi & CA).aab Hiroshi Kurokawa

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Understanding Android Runtime (ART) for Faster Apps https://www.youtube.com/watch?v=1uLzSXWWfDg

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Improvements in ART • App Startup Time • Garbage Collection

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Improvements in ART • App Startup Time • Garbage Collection

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Cloud profiles https://youtu.be/1uLzSXWWfDg?t=210

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Application images https://youtu.be/1uLzSXWWfDg?t=368

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Application images https://youtu.be/1uLzSXWWfDg?t=440

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Unspecialized app process pool System Server Zygote App Process Fork

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Unspecialized app process pool System Server Unspecialized App Process

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Analyzing startup time • StartupAnalyzerKt
 https://android.googlesource.com/platform/tools/ trebuchet/ • Use Activity#reportFullyDrawn()
 https://developer.android.com/reference/android/app/ Activity#reportFullyDrawn()

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Improvements in ART • App Startup Time • Garbage Collection

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Generational Concurrent Compaction

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CC Root reachable unreachable

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CC Root To Space Evacuated Region

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Generational CC Younger Generation Older Generation Full-heap
 GC Young-gen GC

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Generational CC Younger Generation Older Generation

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2-phase collection

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2-phase collection • For full-heap GC • Trace live objects and compute liveness stat • Evacuate regions based on up-to-date stats

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Object pooling • In most cases, it doesn’t make sense • Even if you are sure it improves the performance, it would be better to measure the performance

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Reference https://youtu.be/Zc4JP8kNGmQ