实时统计Android应用的CPU和内存占用 |
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一、应用CPU实时统计
1.1CPU总使用情况
在proc/stat下有当前设备详细的CPU使用情况.详细格式如下: CPU 152342 1421 28562 1600830 12389 553 273 0 0 CPU后面的几位数字的含义分别是 user 从系统启动开始累计到当前时刻，处于用户态的运行时间，不包含 nice值为负进程。 nice 从系统启动开始累计到当前时刻，nice值为负的进程所占用的CPU时间 system 从系统启动开始累计到当前时刻，处于核心态的运行时间 idle 从系统启动开始累计到当前时刻，除IO等待时间以外的其它等待时间 iowait 从系统启动开始累计到当前时刻，IO等待时间 irq 从系统启动开始累计到当前时刻，硬中断时间 softirq 从系统启动开始累计到当前时刻，软中断时间 所以totalCpuTime这个7个属性的和. 1.2当前应用的CPU使用情况/proc/pid/stat下则是该pid的CPU使用情况.详细格式如下: 2341 (com.xxxx.xxxx) S 1131 1131 0 0 -1 3912246 12450 0 2 0 3321 612 0 0 20 0 其中3321 612的含义分别是: 3321：utime 该任务在用户运行状态的时间 612：stime 该任务在核心运行的时间 所以processCpuTime为这个两个个属性的和. 1.3应用的CPU占用当前应用所占CPU的算法是: 100*(processCpuTimeNow - processCpuTimeLast)/(totalCpuTimeNow - totalCpuTimeLast) 12 二、应用内存占用统计统计当前应用的内存占用的方式： （1）从ActivityManager获得MemoryInfo （2）从MemoryInfo里获得TotalPss：memInfo[0].getTotalPss()，其中TotalPss = dalvikPss + nativePss + otherPss 三、DEMO开启一个周期性的任务打印实时CPU和内存占用 import android.app.ActivityManager; import android.content.Context; import android.os.Debug; import android.os.Process; import android.util.Log; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.RandomAccessFile; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; /** * Usage: * Sampler.getInstance().init(getApplicationContext(), 100L); * Sampler.getInstance().start(); */ public class Sampler implements Runnable { private volatile static Sampler instance = null; private ScheduledExecutorService scheduler; private ActivityManager activityManager; private long freq; private Long lastCpuTime; private Long lastAppCpuTime; private RandomAccessFile procStatFile; private RandomAccessFile appStatFile; private final String relativeSavePath = "sourceSummary.txt"; private String savePath; private StringBuilder surveyBuffer; private long count; private Sampler() { scheduler = Executors.newSingleThreadScheduledExecutor(); } public static Sampler getInstance() { if (instance == null) { synchronized (Sampler.class) { if (instance == null) { instance = new Sampler(); } } } return instance; } // freq为采样周期 public void init(Context context, long freq, String savePath) { activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); this.freq = freq; this.savePath = savePath + relativeSavePath; surveyBuffer = new StringBuilder(); count = 1; } public void start() { scheduler.scheduleWithFixedDelay(this, 0L, freq, TimeUnit.MILLISECONDS); } public void writeDown() { try{ File saveFile = new File(savePath); saveFile.createNewFile(); BufferedWriter writer = new BufferedWriter(new FileWriter(saveFile)); writer.write(surveyBuffer.toString()); writer.flush(); writer.close(); } catch (IOException e){ e.printStackTrace(); } } @Override public void run() { double cpu = sampleCPU(); double mem = sampleMemory(); surveyBuffer.append(count++ + ": CPU: " + cpu + "%" + ", Memory: " + mem + "MB\r\n"); } private double sampleCPU() { long cpuTime; long appTime; double sampleValue = 0.0D; try { if (procStatFile == null || appStatFile == null) { procStatFile = new RandomAccessFile("/proc/stat", "r"); appStatFile = new RandomAccessFile("/proc/" + Process.myPid() + "/stat", "r"); } else { procStatFile.seek(0L); appStatFile.seek(0L); } String procStatString = procStatFile.readLine(); String appStatString = appStatFile.readLine(); String procStats[] = procStatString.split(" "); String appStats[] = appStatString.split(" "); cpuTime = Long.parseLong(procStats[2]) + Long.parseLong(procStats[3]) + Long.parseLong(procStats[4]) + Long.parseLong(procStats[5]) + Long.parseLong(procStats[6]) + Long.parseLong(procStats[7]) + Long.parseLong(procStats[8]); appTime = Long.parseLong(appStats[13]) + Long.parseLong(appStats[14]); if (lastCpuTime == null && lastAppCpuTime == null) { lastCpuTime = cpuTime; lastAppCpuTime = appTime; return sampleValue; } sampleValue = ((double) (appTime - lastAppCpuTime) / (double) (cpuTime - lastCpuTime)) * 100D; lastCpuTime = cpuTime; lastAppCpuTime = appTime; } catch (Exception e) { e.printStackTrace(); } return sampleValue; } private double sampleMemory() { double mem = 0.0D; try { // 统计进程的内存信息 totalPss final Debug.MemoryInfo[] memInfo = activityManager.getProcessMemoryInfo(new int[]{Process.myPid()}); if (memInfo.length > 0) { // TotalPss = dalvikPss + nativePss + otherPss, in KB final int totalPss = memInfo[0].getTotalPss(); if (totalPss >= 0) { // Mem in MB mem = totalPss / 1024.0D; } } } catch (Exception e) { e.printStackTrace(); } return mem; } }转载自：https://blog.csdn.net/hello2mao/article/details/68503780 |
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