I used Instruments to import the Energy Diagnostics file from Device.
But how can I export the Energy Consumption result data? such as a csv file? Is it possible?
Related
I want check power usage of my iOS application.
I tried with the Instruments.
In the 'Energy Usage Level' it shows values 1/20 (0 to 20),indicating how much energy your app is using at any given time.
What the value meant 0 to 20?.
And how Can I export the value in to text document
Edit : How can I convert it to percentage of energy usage ?
What Apple mentioned is the following :
The Energy Usage instrument shows a level from 0 to 20, indicating how
much energy your app is using at a 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 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.
the numbers are subjective it just can be used as an indicator on how high your usage is, thats all.
the link also provides a way to log the energy usage level.
My app currently shows up at around top 5 in power usage under settings->Battery. On that screen it says the app spends many hours in the background. Ive tried using Instruments however the analytics provided are not enough to draw any meaningful conclusions or pinpoint any sections of code. Any suggestions how to further investigate power consumption. A tool that ties power consumption to specific source code would be the best?
I would use Xcode Instruments - Energy Diagnostics for what your looking for.
The process is - Open instruments and load the "Energy Diagnostics" template. From there, you record data in instruments and use the app. After your finished you can analyze the data.
Also, right in Xcode you can use the Energy Debug Tool now:
Debug Energy During Development
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. If necessary, dive into Instruments for more in-depth
analysis.
This will give you a good starting point to diagnose, from there you may need to look and analyze deeper (Activity Monitor, File Activity, Time Profiler, etc..) in Instruments.
Here is a User Guide from Apple on how to do this in greater detail and it also shows how to analyze the data using Instruments.
I'm reading lots of 16MB tiff files into a numpy array, then into a python Queue (that never fills) from an external USB disk drive.
iotop in Linux reports file reading speed of around 11-12MB/s.
If I use ImageJ(a Java application) to read the same files, I get speeds of around 26MB/s.
This is the snippet that does the reading: It runs on a separate single thread to the rest of the application.
def fileReader(self):
for file_ in self.files:
im_array = np.asarray(Image.open(file_))
self.im_array_queue.put(im_array)
I'm wondering whether the lower speed is due to a Python IO limitation or whether it's the creation of the array.
Ive found tifffile to be excellent for loading tiffs, comparable to imagej: http://www.lfd.uci.edu/~gohlke/code/tifffile.py.html
It also supports 16bit and multipage tiffs
It's not a Python limitation.
Using openCV
import cv2
im = cv2.imread(file_)
I get speeds up to 26MB/s comparable with ImageJ
Recently I have been using Xcode instruments allocation to profile the memory usage of my app. There are a number of metrics, for example the heapshot analysis and live bytes amongst others. Which of these metrics is the most representative for testing app memory usage and why.
I am trying to find Energy Usage for my iOS App using Instrument.
I got the statistics like Time, Total Activity, Foreground App Activity, Audio Processing and
Graphics in Percentage format. The sum of Foreground App Activity, Audio Processing and
Graphics is different from Total Activity !
But I am not understanding what are the meaning of these columns? Can anybody please explain me the meaning of these statistics and how to use this?
Latest Energy Diagnostics documentation says:
The Energy Usage instrument shows a level from 0 to 20, indicating how
much energy your app is using at a 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 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.
yes, sure there is difference. The best way to use it; do one at a time. observe each Activity Consumption and target optimizing that.