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When I turn on the screen on a sleeping (but not powered off) high-end Samsung Android 7 Nougat device, the device is often very unresponsive (lagging) for 20-200 seconds.

Using the excellent Simple System Monitor (SSM), I can see that it's not a CPU or RAM issue. There also is only minimal network activity during this time. The issue appears to be something writing to internal storage. In all the SSM graphs, it's the only graph that shows a high level of activity during the unresponsive period.

How can I determine which process is performing all that writing to internal storage ? The device is not rooted, nor does it have external storage.

End Anti-Semitic Hate
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    I don't think non-rooted Android would get you anywhere. See https://android.stackexchange.com/q/214229/96277 – Firelord Feb 15 '21 at 15:47
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    I/O overhead is usually not the reason of lagging on devices using flash storage. On Android devices it's mostly a bug in the display HAL or the foreground app (be it a user app or the OS itself; the SystemUI app) which blocks the main UI thread. Logcat can be more helpful in this case. Otherwise tracing apps activities isn't possible without root as Firelord mentioned. – Irfan Latif Feb 15 '21 at 16:03
  • @IrfanLatif Thanks. I notice it the most if I launch Google Play store shortly after turning on the device. Any tips to resolve that particular issue (besides never use Google Play apps... which is tempting!)? – End Anti-Semitic Hate Feb 15 '21 at 17:21
  • As I said, logcat is the first thing you should see to figure out what's going on in the background when the UI hangs. That may lead to a conclusion, and possibly the solution. – Irfan Latif Feb 15 '21 at 17:24
  • @IrfanLatif Thanks... I'll capture some logs and take a look. Do you have a favorite logcat app? I haven't needed to logcat in so long that I can't recall what I previously used. – End Anti-Semitic Hate Feb 15 '21 at 17:26
  • No sorry. I never used an app to get logcat. – Irfan Latif Feb 15 '21 at 17:28

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