Android应用程序的CPU利用率

时间:2013-06-09 09:18:16

标签: android linux

我正在尝试编写一个小代码,用于转储我的Android应用程序的CPU利用率(在过去10秒内使用的cpu百分比,每10秒转储一次)。

现在假设手机中有2个或4个核心。如何有效地转储应用程序使用的%cpu。我搜索了一些top命令的样本,但我不确定如何使用top命令的数字来显示跨多核和最近10秒的CPU利用率。

我添加了以下代码:但buf. exec使用ls命令返回有效结果时始终为空,但top没有。我需要在mainfest中获得一些权限来执行top命令......

    String str = new String();
    str = "top -l1";
    Process p;
    p = Runtime.getRuntime().exec(str);
    BufferedReader bri = new BufferedReader(new InputStreamReader(p.getInputStream()));
    String line;
    /* Skip 6 lines */
    int count = 0;
    char[] buf= new char[10240];
     bri.read(buf);
     Log.e("TEST", new String(buf));

2 个答案:

答案 0 :(得分:0)

我对top不太熟悉,但this question似乎暗示有一种方法可以从各个核心收集数据。

在任何情况下,我建议您使用Dumpsys tool代替,这更有趣,因为它可以为您提供CPU利用率,而不管核心数量。例如,命令:

adb shell dumpsys cpuinfo

将提供表格的输出:

Load: 0.08 / 0.4 / 0.64
CPU usage from 42816ms to 34683ms ago:
system_server: 1% = 1% user + 0% kernel / faults: 16 minor
kdebuglog.sh: 0% = 0% user + 0% kernel / faults: 160 minor
tiwlan_wq: 0% = 0% user + 0% kernel
usb_mass_storag: 0% = 0% user + 0% kernel
pvr_workqueue: 0% = 0% user + 0% kernel
+sleep: 0% = 0% user + 0% kernel
+sleep: 0% = 0% user + 0% kernel
TOTAL: 6% = 1% user + 3% kernel + 0% irq

查看此SO答案,了解有关如何使用Dumpsys的更多详细信息:What's the Android ADB shell "dumpsys" tool and what are its benefits?

答案 1 :(得分:0)

对于任何达成此问题的人来解决这个问题,我发布了关于如何从" top"获取cpu使用价值的解决方案。命令

private String getCpuUsage()
    {
        ArrayList<String> list = new ArrayList<String>();
        String cpuUsageValue = "";

        Process p = null;
        try {

            p = Runtime.getRuntime().exec(new String[] { "sh", "-c", "top -n 1 | grep " + appProcessName }); //appProcessName is com.example.app

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));

        int i =0;
        String line = "";
        try {

            line = reader.readLine();

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        //while(line != null)
        if(line != null)
        {

            //11203  0   0% S    13 901560K  43528K  fg u0_a141  com.example.app

            String lineOuput[] = line.split(" ");
            cpuUsageValue = lineOuput[5].trim();
            //[19472, , 0, , , 0%, S, , , , 15, 904664K, , 44148K, , fg, u0_a141, , com.example.app]

            Log.i(TAG, "cpu usage value : " + cpuUsageValue);

            list.add(line);
            try {
                line = reader.readLine();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            i++;
        }
        else
        {
            Log.i(TAG, "command line is null");

        }

        return cpuUsageValue;


    }
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