如何锁定Android系统CPU的频率

接触到了Android系统的Performance测试,因此有锁定CPU的需求:shell

因为要首先读取到此系统所支持的CPU频率,以后再所支持的频率中选取你想要的频率,以后进行锁定。测试

这个过程,手动也是能够的,直接:spa

1.查看所支持的CPU频率:code

adb shell cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequenciesorm

返回的结果是:416000 728000 900000 1040000blog

2.从上边的结果中选取一个416000 ,以后进行设定:token

echo 416000  > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
echo 416000  > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freqci

以后运行adb shell环境,输入rem

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freqinput

查看设置是否有效,假如一直是416000,则证实设置生效。

 

因为每次都要输入以上代码查看以后设置,因此考虑用自动化实现,代码以下:

setFrequence.bat文件:

@adb shell setprop persist.service.thermal 0
@adb wait-for-device

@adb root
@adb wait-for-device
@adb remount

@for /f "tokens=*" %%i in ('adb shell cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies') do @set var=%%i 

@echo All cpufreqs are: %var%

@set /p last=please input your freq:

::@echo My cpufreq is: %last%

@adb push .\run.sh /system/bin/

@adb shell chmod -R 777 /system/bin

@adb shell /system/bin/run.sh --Cpufreq=%last%

run.sh文件:

#!system//bin/sh

while [ $# -gt 0 ]; do
    case $1 in
      --Cpufreq=*)
        cpufreq=${1#--Cpufreq=}
        ;;
    esac
    shift
  done

#echo cpufreq=`echo $cpufreq`
echo $cpufreq > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
echo $cpufreq > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq  

echo $cpufreq > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
echo $cpufreq > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq  

echo scaling_min_freq=`cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq`
echo scaling_max_freq=`cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq`


echo scaling_cur_freq=
i=10
while [[ $i -gt 1 ]];
do
 cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq;
 sleep 5;
 ((i--));
done

把上边两个文件放到一个folder下边,双击执行setFrequence.bat文件,输入你想要的频率便可。

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