Measure Energy Impact with Instruments
Important
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The debug navigator in Xcode includes an Energy impact gauge, which provides a high-level overview of energy usage as you test your app. Consult this gauge regularly throughout your app’s testing cycle to assess your app’s energy impact and identify potential problem areas up-front. See Debugging Gauges. Dive into Instruments if more in-depth analysis is needed.
The Instruments app, which is included with Xcode, gathers data from your running app and presents it in a graphical timeline. You gather data about performance areas such as your app’s CPU usage, disk activity, network activity, and graphics operations. By viewing the data together, you can analyze different aspects of your app’s performance to identify potential areas of improvement.
Note
For detailed information about using Instruments, see Instruments User Guide.
Use the Energy Diagnostics Profiling Template
The Energy Diagnostics profiling template monitors factors that affect energy usage on an iOS device, including CPU activity, network activity, screen brightness, and more. Identify the areas where usage is highest, and see if you can reduce impact in those areas. For example, you might find opportunities to defer discretionary or network tasks until more energy efficient times, such as when the device is plugged in or on Wi-Fi.
- Launch Instruments and create a new trace document that targets your device and app with the Energy Diagnostics profiling template.
- Click the Record button () or press Command-R to begin recording a trace.TipFor best results, consider performing the trace wirelessly. Doing so will allow you to more accurately profile the device in a real world scenario—on battery power, with accelerometers, and so on. To learn how to enable wireless device profiling, see Target an iOS Device Wirelessly in Instruments User Guide.
- Use the app normally on the device, while allowing energy data to be collected.
- Click the Stop button () or press Command-R again when complete.
- Go through the collected data and look for spikes or areas of otherwise unusual or unexpected activity. Then, review the code in these areas to determine whether improvements can be made.
Tip
The Energy Usage instrument indicates a level from 0 to 20, indicating how much energy your app is using at any given time. These numbers are subjective. If your app’s energy usage level is occasionally high, it doesn’t necessarily mean that your app has a problem. Your app may simply require more energy for some of the tasks it performs. For example, it may use the GPS while performing complex network operations. This is valid energy use. What you should look for are spikes or areas of high energy use that are unexpected or that could be performed at more optimal times.
Log Energy Usage Directly on an iOS Device
Without tethering your device to Instruments (either wirelessly or wired), you can log energy-related data under normal use in order to take realistic measurements. With energy logging enabled, your iOS device records energy-related data unobtrusively while the device is used. Because logging is efficient, you can log all day. Logging continues even while the device is in sleep mode. However, if the device’s battery drains completely or the iOS device is powered off, the log data is lost.
- Go to Settings > Developer > Logging on your device.NoteTo see the Developer settings, you must provision the device for development and plug it into your Mac while Xcode or Instruments is running. If your device hasn’t been provisioned yet, see Configuring Your Xcode Project for Distribution and Launching Your App on Devices. Even after the device has been provisioned, the Developer setting disappears when the device is rebooted or powered off. To restore the setting, reconnect the device to Xcode or Instruments.
- Enable energy logging.
- Tap Start Recording.
- Use your device normally.
- When you’re done, return to Settings > Developer > Logging and tap Stop Recording.
To import logged energy data from an iOS device
- Launch Instruments and create a new trace document that targets your device and app with the Energy Diagnostics profiling template.
- Choose File > Import Logged Data from Device.The logged data is imported and displayed in the timeline and detail panes.
Use Other Profiling Templates and Instruments to Measure Energy Use
A variety of factors affect the energy used by an iOS app. Although the Energy Diagnostics profiling template analyzes a range of statistics, you can use other profiling templates and instruments to examine and assess your app’s energy impact.
Activity Monitor Profiling Template. Use this template to monitor overall CPU, disk I/O, and network usage.
Core Animation Profiling Template. Use this template to measure graphics performance and CPU usage. Enable the Flash Updated Regions setting of the template’s Core Animation instrument to see each screen update occurring in your app and watch for unnecessary or unexpected updates.
GPU Driver Profiling Template. Use this template to measure GPU driver statistics and sample active CPU usage.
Location Energy Instrument. Use this instrument to measure the energy impact and duration of requests to Core Location.
Metal System Trace Profiling Template. Use this template to measure the performance of iOS Metal applications by tracing information from the application, driver, and GPU layers.
Network Profiling Template. Use this template to analyze the TCP/IP and UDP/IP connections your app uses.
Time Profiler Profiling Template. Use this template to perform low-overhead time-based sampling of running processes. Time Profiler watches the running threads in your app and takes samples at regular intervals. A complete backtrace is collected for each sample, allowing you to drill down into a sample to find exactly where in your code large amounts of time are being spent.
Your Custom Template Here. The templates and instruments above provide high value by analyzing multiple aspects of your app, which may affect energy. If you prefer to focus in on a more specific area, however, you can add individual instruments to the Blank profiling template. For example, you might add the CPU Activity instrument since energy usage is tied closely to how much CPU your app uses over time. If you think you might need to perform the same type of analysis again, be sure and save your configuration as a template. See Save a Trace Document as a Profiling Template in Instruments User Guide.
Again, with all templates and instruments, monitor for spikes or areas of high or unexpected activity, and see whether you can improve those areas to reduce network, CPU, and other resource utilization.
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Detailed Battery Usage Mac App For Iphone
Check battery usage
To see an overview of your battery level and activity for the last 24 hours and up to the last 10 days, go to Settings > Battery.
When you tap one of the columns on your screen, you can see which apps contributed to your battery usage during that time period, and the proportion of battery used for the app.
To see how long each app was in use on screen or in the background, tap Show Activity. Under each app, you might see these usage types:
![App App](/uploads/1/2/7/2/127240209/323228286.jpg)
- Background Activity means that your battery was used while the app was doing something in the background.
- Audio means that apps play audio while running in the background.
- No Cell Coverage and Low Signal means that your device is searching for a signal or being used with a low signal.
- Backup & Restore indicates that your device has been backing up to iCloud or restoring from an iCloud backup.
- Connected to Charger means the app was used only when your device was charging.
You can also see when your device was last connected to a charger and the last charge level.
Adjust settings to improve battery life
While viewing your battery usage, you might get a suggestion like Enable Auto-Brightness or Adjust Display Brightness. This is because the software determined that changing these settings could improve your battery life.
Learn more about maximizing the battery performance and lifespan of your iPhone, iPad, or iPod touch.
Use Low Power Mode
If you want to extend the battery life on your iPhone, turn on Low Power Mode. This reduces power consumption until you turn it off or charge your iPhone to 80%. When Low Power Mode is on, certain settings and features like app updates, downloads of new TV shows or podcast episodes, mail fetch, and some visual effects such as True Tone are reduced or disabled.
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Learn more about Low Power Mode.
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Battery Usage App
With iOS 11.3 and later, you can see your battery health and if a battery needs to be replaced. Find out more in iPhone Battery and Performance.