Schlagwort-Archive: Battery

Facebook app is draining your iPhone’s battery

The last few weeks my beloved iPhone 4S lost battery extremely fast. After a normal work day there was hardly 10% left. That means after 12 hours and little usage of the iPhone.

So I went on to find the cause. As an iOS developer I know Instruments form Apple’s developer tools. Instruments is mainly a tool to benchmark your own apps, find slow parts and fix memory leaks.

But Instruments can show the running processes on your iPhone, too. It’s just like Activity Monitor on your Mac.

There is this nice overview and something caught my eye:
AcitivityMonitorCPUTime

That is a list of processes using the most CPU time. Or more easily said: that are the apps that have been running the longest time. The first four are system processes (SpringBoard is essentially the thing that shows your home screen and stuff), at the bottom there is the Facebook app. It is using twice as much time as DTMobileIS (that is the process that feeds Instruments with live data from the phone). That seemed a little much to me. I’m using Facebook quite often, but not like every minute of the day.

So I let Instruments run a little longer and watched the flags.
The flags indicate when an app is getting started, getting terminated and what interested me the most: when it’s getting send to the background and when it’s getting suspended.
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