Get Memory Usage in Android

Question

Is there any API by which we can get CPU or Memory usage of android   I have tried one code as below   package com infostretch mainactivity   import java io BufferedReader  import java io FileInputStream  import java io IOException  import java io InputStreamReader   public class CPULoad        long total   0      long idle   0       float usage   0       public CPULoad                 readUsage               public float getUsage                 readUsage            return usage             private void readUsage                 try                       BufferedReader reader   new BufferedReader new InputStreamReader new FileInputStream   proc stat     1000               String load   reader readLine                reader close                 String   toks   load split                    long currTotal   Long parseLong toks 2     Long parseLong toks 3     Long parseLong toks 4                long currIdle   Long parseLong toks 5                 this usage    currTotal - total    100 0f    currTotal - total   currIdle - idle               this total   currTotal              this idle   currIdle                    catch IOException ex                        ex printStackTrace                        Is this the correct way to do it

User · Answer

Since the OP asked about CPU usage AND memory usage  accepted answer only shows technique to get cpu usage   I d like to recommend the ActivityManager class and specifically the accepted answer from this question  How to get current memory usage in android

User · Answer

Check the Debug class  http   developer android com reference android os Debug html i e  Debug getNativeHeapAllocatedSize    It has methods to get the used native heap  which is i e  used by external bitmaps in your app  For the heap that the app is using internally  you can see that in the DDMS tool that comes with the Android SDK and is also available via Eclipse   The native heap   the heap as indicated in the DDMS make up the total heap that your app is allocating   For CPU usage I m not sure if there s anything available via API SDK

User · Answer

An easy way to check the CPU usage is to use the adb tool w  top  I e    adb shell top -m 10

User · Answer

I use this function to calculate cpu usage  Hope it can help you   private float readUsage         try           RandomAccessFile reader   new RandomAccessFile   proc stat    r            String load   reader readLine             String   toks   load split            Split on one or more spaces          long idle1   Long parseLong toks 4            long cpu1   Long parseLong toks 2     Long parseLong toks 3     Long parseLong toks 5                   Long parseLong toks 6     Long parseLong toks 7     Long parseLong toks 8             try               Thread sleep 360             catch  Exception e              reader seek 0           load   reader readLine            reader close             toks   load split                 long idle2   Long parseLong toks 4            long cpu2   Long parseLong toks 2     Long parseLong toks 3     Long parseLong toks 5                 Long parseLong toks 6     Long parseLong toks 7     Long parseLong toks 8             return  float  cpu2 - cpu1      cpu2   idle2  -  cpu1   idle1           catch  IOException ex            ex printStackTrace               return 0

User · Answer

enter the android terminal and then you can type the following commands  dumpsys cpuinfo   shell android     dumpsys cpuinfo                                               Load  0 8   0 75   1 15 CPU usage from 69286ms to 9283ms ago with 99  awake    47  1118 com wxg sodproject  12  user   35  kernel   1 6  1225 android process media  1  user   0 6  kernel   1 3  263 mpdecision  0 1  user   1 2  kernel   0 1  32747 kworker u 1  0  user   0 1  kernel   0 1  883 com android systemui  0 1  user   0  kernel   0 1  521 system server  0 1  user   0  kernel   faults  14 minor   0 1  1826 com quicinc trepn  0 1  user   0  kernel   0 1  2462 kworker 0 2  0 1  user   0  kernel   0 1  32649 kworker 0 0  0  user   0 1  kernel   0  118 mmcqd 0  0  user   0  kernel   0  179 surfaceflinger  0  user   0  kernel   0  46 kinteractiveup  0  user   0  kernel   0  141 jbd2 mmcblk0p26  0  user   0  kernel   0  239 sdcard  0  user   0  kernel   0  1171 com xiaomi channel pushservice  0  user   0  kernel   faults  1 minor   0  1207 com xiaomi channel  0  user   0  kernel   faults  1 minor   0  32705 kworker 0 1  0  user   0  kernel 12  TOTAL  3 2  user   9 4  kernel   0  iowait

User · Answer

Based on the previous answers and personnal experience  here is the code I use to monitor CPU use  The code of this class is written in pure Java   import java io IOException  import java io RandomAccessFile          Utilities available only on Linux Operating System          lt p gt     A typical use is to assign a thread to CPU monitoring      lt  p gt          lt pre gt      amp  064 Override    public void run         while  CpuUtil monitorCpu                LinuxUtils linuxUtils   new LinuxUtils                int pid   android os Process myPid            String cpuStat1   linuxUtils readSystemStat            String pidStat1   linuxUtils readProcessStat pid               try               Thread sleep CPU WINDOW             catch  Exception e                          String cpuStat2   linuxUtils readSystemStat            String pidStat2   linuxUtils readProcessStat pid               float cpu   linuxUtils getSystemCpuUsage cpuStat1  cpuStat2           if  cpu  amp gt   0 0f                 printLine mOutput   amp quot total amp quot   Float toString cpu                          String   toks   cpuStat1 split  amp quot   amp quot            long cpu1   linuxUtils getSystemUptime toks               toks   cpuStat2 split  amp quot   amp quot            long cpu2   linuxUtils getSystemUptime toks               cpu   linuxUtils getProcessCpuUsage pidStat1  pidStat2  cpu2 - cpu1           if  cpu  amp gt   0 0f                 printLine mOutput   amp quot  amp quot    pid  Float toString cpu                          try               synchronized  this                    wait CPU REFRESH RATE                           catch  InterruptedException e                e printStackTrace                return                          Log i  amp quot THREAD CPU amp quot    amp quot Finishing amp quot             lt  pre gt      public final class LinuxUtils           Warning  there appears to be an issue with the column index with android linux         it was observed that on most present devices there are actually        two spaces between the  cpu  of the first column and the value of         the next column with data  The thing is the index of the idle         column should have been 4 and the first column with data should have index 1          The indexes defined below are coping with the double space situation         If your file contains only one space then use index 1 and 4 instead of 2 and 5         A better way to deal with this problem may be to use a split method         not preserving blanks or compute an offset and add it to the indexes 1 and 4       private static final int FIRST SYS CPU COLUMN INDEX   2       private static final int IDLE SYS CPU COLUMN INDEX   5           Return the first line of  proc stat or null if failed         public String readSystemStat              RandomAccessFile reader   null          String load   null           try               reader   new RandomAccessFile   proc stat    r                load   reader readLine              catch  IOException ex                ex printStackTrace              finally               Streams close reader                      return load                        Compute and return the total CPU usage  in percent                  param start                   first content of  proc stat  Not null          param end                   second content of  proc stat  Not null          return 12 7 for a CPU usage of 12 7  or -1 if the value is not                available          see   link  readSystemStat                public float getSystemCpuUsage String start  String end            String   stat   start split    s            long idle1   getSystemIdleTime stat           long up1   getSystemUptime stat            stat   end split    s            long idle2   getSystemIdleTime stat           long up2   getSystemUptime stat               don t know how it is possible but we should care about zero and            negative values          float cpu   -1f          if  idle1  gt   0  amp  amp  up1  gt   0  amp  amp  idle2  gt   0  amp  amp  up2  gt   0                if   up2   idle2   gt   up1   idle1   amp  amp  up2  gt   up1                    cpu    up2 - up1     float    up2   idle2  -  up1   idle1                    cpu    100 0f                                   return cpu                        Return the sum of uptimes read from  proc stat                  param stat                   see   link  readSystemStat                public long getSystemUptime String   stat                           from man 5 proc   proc stat kernel system statistics  Varies with            architecture  Common entries include  cpu 3357 0 4313 1362393                        The amount of time  measured in units of USER HZ  1 100ths of a            second on most architectures  use sysconf  SC CLK TCK  to obtain the            right value   that the system spent in user mode  user mode with low            priority  nice   system mode  and the idle task  respectively  The            last value should be USER HZ times the second entry in the uptime            pseudo-file                         In Linux 2 6 this line includes three additional columns  iowait -            time waiting for I O to complete  since 2 5 41   irq - time servicing            interrupts  since 2 6 0-test4   softirq - time servicing softirqs             since 2 6 0-test4                          Since Linux 2 6 11  there is an eighth column  steal - stolen time             which is the time spent in other operating systems when running in a            virtualized environment                        Since Linux 2 6 24  there is a ninth column  guest  which is the time            spent running a virtual CPU for guest operating systems under the            control of the Linux kernel                          with the following algorithm  we should cope with all versions and            probably new ones          long l   0L           for  int i   FIRST SYS CPU COLUMN INDEX  i  lt  stat length  i                  if  i    IDLE SYS CPU COLUMN INDEX        bypass any idle mode  There is currently only one                  try                       l    Long parseLong stat i                      catch  NumberFormatException ex                        ex printStackTrace                        return -1L                                                     return l                        Return the sum of idle times read from  proc stat                  param stat                   see   link  readSystemStat                public long getSystemIdleTime String   stat            try               return Long parseLong stat IDLE SYS CPU COLUMN INDEX              catch  NumberFormatException ex                ex printStackTrace                       return -1L                 Return the first line of  proc pid stat or null if failed         public String readProcessStat int pid             RandomAccessFile reader   null          String line   null           try               reader   new RandomAccessFile   proc     pid     stat    r                line   reader readLine              catch  IOException ex                ex printStackTrace              finally               Streams close reader                      return line                        Compute and return the CPU usage for a process  in percent                  lt p gt         The parameters   code totalCpuTime  is to be the one for the same period        of time delimited by   code statStart  and   code statEnd           lt  p gt                  param start                   first content of  proc pid stat  Not null          param end                   second content of  proc pid stat  Not null          return the CPU use in percent or -1f if the stats are inverted or on                error         param uptime                   sum of user and kernel times for the entire system for the                   same period of time          return 12 7 for a cpu usage of 12 7  or -1 if the value is not available                or an error occurred          see   link  readProcessStat int               public float getProcessCpuUsage String start  String end  long uptime             String   stat   start split    s            long up1   getProcessUptime stat            stat   end split    s            long up2   getProcessUptime stat            float ret   -1f          if  up1  gt   0  amp  amp  up2  gt   up1  amp  amp  uptime  gt  0                 ret   100 f    up2 - up1     float  uptime                     return ret                        Decode the fields of the file   code  proc pid stat  and return  utime          stime                  param stat                   obtained with   link  readProcessStat int               public long getProcessUptime String   stat            return Long parseLong stat 14     Long parseLong stat 15                          Decode the fields of the file   code  proc pid stat  and return  cutime          cstime                  param stat                   obtained with   link  readProcessStat int               public long getProcessIdleTime String   stat            return Long parseLong stat 16     Long parseLong stat 17                          Return the total CPU usage  in percent          lt p gt         The call is blocking for the time specified by elapse          lt  p gt                  param elapse                   the time in milliseconds between reads          return 12 7 for a CPU usage of 12 7  or -1 if the value is not                available              public float syncGetSystemCpuUsage long elapse             String stat1   readSystemStat            if  stat1    null                return -1 f                     try               Thread sleep elapse             catch  Exception e                       String stat2   readSystemStat            if  stat2    null                return -1 f                     return getSystemCpuUsage stat1  stat2                         Return the CPU usage of a process  in percent          lt p gt         The call is blocking for the time specified by elapse          lt  p gt                  param pid         param elapse                   the time in milliseconds between reads          return 6 32 for a CPU usage of 6 32  or -1 if the value is not                available              public float syncGetProcessCpuUsage int pid  long elapse             String pidStat1   readProcessStat pid           String totalStat1   readSystemStat            if  pidStat1    null    totalStat1    null                return -1 f                     try               Thread sleep elapse             catch  Exception e                e printStackTrace                return -1 f                     String pidStat2   readProcessStat pid           String totalStat2   readSystemStat            if  pidStat2    null    totalStat2    null                return -1 f                     String   toks   totalStat1 split    s            long cpu1   getSystemUptime toks            toks   totalStat2 split    s            long cpu2   getSystemUptime toks            return getProcessCpuUsage pidStat1  pidStat2  cpu2 - cpu1              There are several ways of exploiting this class  You can call either syncGetSystemCpuUsage or syncGetProcessCpuUsage but each is blocking the calling thread  Since a common issue is to monitor the total CPU usage and the CPU use of the current process at the same time  I have designed a class computing both of them  That class contains a dedicated thread  The output management is implementation specific and you need to code your own   The class can be customized by a few means  The constant CPU WINDOW defines the depth of a read  i e  the number of milliseconds between readings and computing of the corresponding CPU load  CPU REFRESH RATE is the time between each CPU load measurement  Do not set CPU REFRESH RATE to 0 because it will suspend the thread after the first read   import java io File  import java io FileNotFoundException  import java io FileOutputStream  import java io OutputStream   import android app Application  import android os Handler  import android os HandlerThread  import android util Log   import my app LinuxUtils  import my app Streams  import my app TestReport  import my app Utils   public final class CpuUtil        private static final int CPU WINDOW   1000       private static final int CPU REFRESH RATE   100     Warning  anything but  gt  0      private static HandlerThread handlerThread       private static TestReport output       static           output   new TestReport            output setDateFormat Utils getDateFormat Utils DATE FORMAT ENGLISH               private static boolean monitorCpu                  Construct the class singleton  This method should be called in          link Application onCreate                    param dir                   the parent directory         param append                   mode             public static void setOutput File dir  boolean append            try               File file   new File dir   cpu txt                output setOutputStream new FileOutputStream file  append                if   append                    output println file getAbsolutePath                     output newLine 1                       print header                  printLine output   Process    CPU                      output flush                             catch  FileNotFoundException e                e printStackTrace                             Start CPU monitoring        public static boolean startCpuMonitoring             CpuUtil monitorCpu   true           handlerThread   new HandlerThread  CPU monitoring       NON-NLS-1          handlerThread start             Handler handler   new Handler handlerThread getLooper             handler post new Runnable                   Override             public void run                     while  CpuUtil monitorCpu                         LinuxUtils linuxUtils   new LinuxUtils                         int pid   android os Process myPid                        String cpuStat1   linuxUtils readSystemStat                        String pidStat1   linuxUtils readProcessStat pid                        try                           Thread sleep CPU WINDOW                         catch  Exception e                                               String cpuStat2   linuxUtils readSystemStat                        String pidStat2   linuxUtils readProcessStat pid                        float cpu   linuxUtils                              getSystemCpuUsage cpuStat1  cpuStat2                       if  cpu  gt   0 0f                             printLine output   total   Float toString cpu                                               String   toks   cpuStat1 split                           long cpu1   linuxUtils getSystemUptime toks                        toks   cpuStat2 split                           long cpu2   linuxUtils getSystemUptime toks                        cpu   linuxUtils getProcessCpuUsage pidStat1  pidStat2                              cpu2 - cpu1                       if  cpu  gt   0 0f                             printLine output       pid  Float toString cpu                                               try                           synchronized  this                                wait CPU REFRESH RATE                                                   catch  InterruptedException e                            e printStackTrace                            return                                                           Log i  THREAD CPU    Finishing                                        return CpuUtil monitorCpu                 Stop CPU monitoring        public static void stopCpuMonitoring             if  handlerThread    null                monitorCpu   false              handlerThread quit                handlerThread   null                           Dispose of the object and release the resources allocated for it        public void dispose              monitorCpu   false           if  output    null                OutputStream os   output getOutputStream                if  os    null                    Streams close os                   output setOutputStream null                              output   null                       private static void  printLine TestReport output  String process  String cpu            output stampln process         cpu

[android] Get Memory Usage in Android

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