Understanding Android Garbage Collection Logs

Understanding Android Garbage Collection Logs

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Memory utilization on the mobile app has a significant impact on customer experience. If your app creates a lot of objects, then the Android run time (ART) environment will trigger garbage collection (GC) frequently. Android garbage collection is an automatic process which removes unused objects from memory. However, frequent garbage collection consumes a lot of CPU, and it will also pause the app. Frequent pauses can jank the app (i.e. stuttering, juddering, or halting).

Thus, you need to understand how many objects your app is creating, how frequently garbage collection is triggered, how much time it takes to complete, and how much memory is reclaimed after every event. All this information is present in the runtime log messages. Whenever a GC event runs, a log line is printed in the runtime log messages. You can view those log lines through logcat.

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May 12, 2017 at 10:27AM

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