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Number crunching :
Android tablet computation slowing down with screen off
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Azmodes Send message Joined: 28 Nov 16 Posts: 11 Credit: 6,317,066 RAC: 6 |
I have a tablet (Quanta Gigaset QV830 - SDK:17 ABI: armeabi-v7a) running Android 4.2.2 and crunching on all 4 cores 24/7 and recently I noticed that computation appears to be considerably slower whenever the screen is turned off (in ~half an hour a task progressed by about 0.3 % with screen off and 1,3 % with screen on, it was connected to a power supply in both instances). Is this because the tablet goes into some kind of power saving mode whenever the screen is turned off, throttling the processor (it's not "going to sleep", though)? Or something to do with the BOINC app (7.4.53) or something (the event log doesn't show anything to that effect)? I enabled to always have the screen on through the developer options, but I would of course prefer otherwise for obvious reasons. I searched BOINC projects as a whole for someone else with this problem, but all I could find is people wanting to get rid of sleep mode (though mine's not doing that) or keeping the screen on indefinitely (which I know how to do). Any input appreciated. |
qbit Send message Joined: 19 Sep 04 Posts: 630 Credit: 6,868,528 RAC: 0 |
Did you check runtimes on the same task? There can be a huge difference in runtimes between different tasks, depending on the AR (angle range) and other factors. |
Azmodes Send message Joined: 28 Nov 16 Posts: 11 Credit: 6,317,066 RAC: 6 |
Yes, it was the same task. |
JWNoctis Send message Joined: 6 Nov 07 Posts: 20 Credit: 329,409 RAC: 0 |
Maybe you can find something that records processor performance level - I think there was something on xda-developers for that but that's years ago. It would be reasonable to assume that your tablet was throttling down when screen is off. There probably are tools that would change it. |
Azmodes Send message Joined: 28 Nov 16 Posts: 11 Credit: 6,317,066 RAC: 6 |
Thanks, I'll try that. Just did another check with another task and it's the same performance ratio. |
Raistmer Send message Joined: 16 Jun 01 Posts: 6325 Credit: 106,370,077 RAC: 121 |
Most probably it's tablet's firmware. I encountered 2 different tablet models already that completely stop computations with screen OFF. Would be good to decouple CPU throttling and screen light OFF, but seems on those models they bound together. Not all Android devices behave in such way. SETI apps news We're not gonna fight them. We're gonna transcend them. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Most probably it's tablet's firmware. I found that out with my first android phone. A MyTouch 3G Slide. It would go from a max of 600MHz to only 300MHz with the screen off. So I run it with the brightness turned all the way down. My Samsung Galaxy S4 and Tab S2 seem to run full speed with the screen off or on with BOINC projects. There might be CyanogenMods for some devices that would disable or allow the user to control the CPU throttling. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Azmodes Send message Joined: 28 Nov 16 Posts: 11 Credit: 6,317,066 RAC: 6 |
Yeah, I've been considering CyanogenMod for the tablet. I also have a Motorola XT1068 with an up-to-date Android version and it doesn't appear to throttle. |
Azmodes Send message Joined: 28 Nov 16 Posts: 11 Credit: 6,317,066 RAC: 6 |
So it seems that the clock screensaver does not cause any throttling and should be better for the display too. Seems like a good compromise. |
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