I'm trying to test an app's performance on android at different CPU states. So i will like to lock the CPU at say 1000Mhz and take readings and then overload the CPU and take readings. My question is: Is there anyway to lock the CPU and possibly the RAM at certain lock/freeze rates?? Any link to documentations on this will be highly appreciated.
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on a device or the emulator? – JRsz Sep 18 '14 at 11:43
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Hi..sorry on an actual android device – user3312054 Sep 18 '14 at 11:47
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You can try my answer, I tried in Nexus 4, and it works fine. – PageNotFound Sep 18 '14 at 11:59
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Does my answer work? – PageNotFound Sep 19 '14 at 06:51
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yes it did..another thing please, is the anyway to "programatically" load the CPU and make it very busy? – user3312054 Sep 19 '14 at 12:31
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1Just do some calculation. For multi cores, just start multi threads. I think you should ask another question for this. – PageNotFound Sep 19 '14 at 12:43
1 Answers
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Follow these steps(all steps with root privilege):
1. stop mpdecision
2. In /sys/devices/system/cpu you can see how many cores in your device, if dual core, you will see cpu0 and cpu1 two folders.
3. write 0 or 1 to disable or enable core
echo "0" > /sys/devices/system/cpu/cpu1/online # disable core
echo "1" > /sys/devices/system/cpu/cpu1/online # enable core
4. change governor of CPU
echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
5. set frequency
echo "1000000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
remember to check /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq to see what frequency you can set in step 5.
For step 4 and 5, you can set frequency through this app(need root privilege).
For more details, you can see this.
PageNotFound
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Ok will try that and report back. Also do i send thede commands through adb shell?? – user3312054 Sep 18 '14 at 12:02
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3Yes, through `adb shell`, first `adb shell`, then `su`, and follow my steps – PageNotFound Sep 18 '14 at 12:03
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yes this is certainly the correct answer..thank you for the link also..very nice – user3312054 Sep 19 '14 at 12:30
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can you please edit step 4 of your answer, it should be scaling_governor without an s @PageNotFound – user3312054 Sep 20 '14 at 10:28