When coding for Android, is there a way to get the CPU usage for each core of the device individually?

Question

this is my first time asking a question here. I tried to be well researched, so I apologize in advance if I overlooked a post for this question before. I'm looking to see if I can get the usage statistics for my app while it's running. I'm running some relatively high performance programs, and I'm interested in seeing how well the computing is being distributed between the cores (and displaying this information in the program itself).

Again, sorry if this post is riddled with ignorance!

Dylan M, share your result please ! – Julien Chabanon Aug 01 '12 at 21:33 — Julien Chabanon, Aug 01 '12 at 21:33

score 6 · Accepted Answer · edited May 23 '17 at 12:01

6

You can check the number of CPU cores by looking at the files under the directory - /sys/devices/system/cpu/. This is also possible on non-rooted phones. Here is a function that can give you the number of cores on the device -

    public int getNumOfCpus() {

    class CPUFilter implements FileFilter {
        @Override
        public boolean accept(File pathname) {
            // Check if filename is "cpu0", "cpu1,...
            if (Pattern.matches("cpu[0-9]", pathname.getName())) {
                return true;
            }
            return false;
        }
    }

    try {
        // Get directory containing CPU info
        File dir = new File("/sys/devices/system/cpu/");
        File[] files = dir.listFiles(new CPUFilter());
        // Return the number of cores 
        return files.length;
    } catch (Exception e) {
        e.printStackTrace();
        return 1;
    }

}

You can then get the CPU utilization per core by modifying function mentioned in the answer here - Get Memory Usage in Android

edited May 23 '17 at 12:01

Community

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answered Jun 14 '12 at 18:02

Tushar Gupta

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Thanks! This worked out pretty well. I just modified your function to return a String array of the paths for the processors, then I modified the function from the URL to take the path as an argument and just looped over the array. Quick and easy :D – Dylan M. Jun 14 '12 at 20:59
Can you please share your code here with us? I am confused because /sys/devices/system/cpu/cpu0 etc are folders plus function in the mentioned thread reads data from the file /proc/stat – Khurram Majeed Feb 05 '13 at 14:53
@DylanM. can u pls share how u calculate cpu usage for each app ? – user3233280 Nov 24 '14 at 18:37

When coding for Android, is there a way to get the CPU usage for each core of the device individually?

1 Answers1