How to get the accurate CPU Usage per process and process Idle CPU Time

Question

I'hv been struggling to get the accurate CPU Usage per process and process Idle CPU Time.. I tried " top " command proc/[pid]/stat folder but still trying my luck..

TOP command gives CPU usage for all the processes running in fg(foreground) and bg(background) but it is not as accurate i feel.. because it shows %CPU 0, even if the process is running in the background.. Any other way? please help

Dumpsys cpuinfo works absolutely fine on 2.2 and 2.3.6 but when i tried on 4.0, it gives me an error message for output like "Permission Denial: can't dump Battery service from pid..." Also, when the application is launched there is an item in the log tagged with "PackageManager" statingNot granting permission android.permissionDUMP to package.... (protectionLevel = 3 ...)" — mn0102, Apr 24 '13 at 12:16
DUMP permission will not work after Android 4.0 or 4.1, you have to use your app as a root user or put it into /system/app/yourapp.apk. — VISHAL VIRADIA, Apr 30 '13 at 12:16
@VISHAL /system/app/yourapp.apk. requires either a rooted ROM or a rooted device which is not what i need. — mn0102, May 05 '13 at 18:03

mn0102 · Accepted Answer · 2013-05-22T11:58:04.987

2

I have found a way to do it myself.. I am using

proc/[pid]/stat -> for per process CPU Usage 14th and 15th parameter
proc/stat -> for All processes CPU consumption at the same time

edited May 22 '13 at 11:58

answered May 05 '13 at 18:07

mn0102

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Answer with more explanation: http://stackoverflow.com/a/31274572/2872712 – apricot May 10 '17 at 22:06
`/proc/stat` is no longer accessible as of Android O ([see here](https://issuetracker.google.com/issues/37140047)) – Nathan F. Feb 25 '20 at 00:49

score 1 · Answer 2 · answered Jul 24 '14 at 07:02

You can get CPU usage with:

ArrayList<String> list = new ArrayList<String>();
    try {
        // -m 10, how many entries you want, -d 1, delay by how much, -n 1,
        // number of iterations
        Process p = Runtime.getRuntime().exec("top -m 15 -d 1 -n 1");

        BufferedReader reader = new BufferedReader(new InputStreamReader(
                p.getInputStream()));
        int i = 0;
        String line = reader.readLine();
        while (line != null) {
            Log.e("Output "   i, line);
            list.add(line);
            line = reader.readLine();
            i  ;
        }

        p.waitFor();

        Toast.makeText(getBaseContext(), "Got update",Toast.LENGTH_SHORT)
                .show();

    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(getBaseContext(), "Caught", Toast.LENGTH_SHORT)
                .show();
    }

Top command sums up the results. The results are not in the decimal values. — mn0102, Jul 24 '14 at 10:06

How to get the accurate CPU Usage per process and process Idle CPU Time

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