FWIW I am having battery issues recently that are entirely blamed on 'cell standby' and 'phone idle' (on the order of 43%/42%, with a couple of apps thrown in for luck at the bottom.)
I initially tried to blame nagdroid (15 min polling or some such) but disabled polling and its still bad. :/ On Thu, Oct 8, 2009 at 2:01 PM, Dianne Hackborn <[email protected]> wrote: > The G1 and Sapphire don't have a current meter on the battery, so the > battery levels they show are approximate based on complicated software in > the radio and kernel monitoring what is happening in the system. The > battery usage UI is also an approximation of power consumption, based on > another kind of software monitoring. In this case I would probably trust > the latter more than the former -- you'd really want to run your device > until the battery is dead to get an idea of the actual impact, it is very > likely that you could see the level not drop a whole much (3% is well within > the range of noise) and then suddenly go down a lot. > > On Thu, Oct 8, 2009 at 10:43 AM, Disconnect <[email protected]> wrote: >> >> I was going to post basically the same thing but his 3%-after-2-hours >> measurement doesn't really agree with that. >> >> On Thu, Oct 8, 2009 at 1:40 PM, RichardC <[email protected]> >> wrote: >> > >> > By running your background task every 2secs your are basically keeping >> > the phone permanently on. Even though your app is not using much CPU >> > it has to wake the phone from any sleep state every 2secs. So it >> > either will not allow the phone to sleep or mostly keep it awake. >> > Waking the phone will power up all hardware devices that are needed >> > from any low power state they are currently in and reset their sleep >> > timeouts. >> > >> > Basically any background tasks (something not associated with the >> > current foreground activity the user is interacting with) should only >> > wake up very infrequently (say greater then 60mins). >> > >> > Also are you sleeping in your background task or using an alarm >> > event. Sleeping is bad ... see lots of posts by Dianne Hackborn on >> > this very subject. >> > >> > -- >> > RichardC >> > >> > On Oct 8, 5:55 pm, dadical <[email protected]> wrote: >> >> I have an application that runs a background service. This background >> >> service wakes and runs once every 2 seconds. The background service >> >> registers as a listener with the orientation sensor with the lowest >> >> possible rate of event delivery (application). When my service thread >> >> wakes it uses the latest value delivered by the sensor events, so >> >> there is no heavy-weight processing being done on the sensor thread. >> >> Furthermore, the background thread is doing very light processing when >> >> it wakes. >> >> >> >> I've done tests that show that my background thread poses very minor >> >> power overhead, somewhere around 3%. The test was basically: charge >> >> to 100%, leave phone on for two hours with service running, record >> >> battery level. Repeat with service off and compare. >> >> >> >> However "Battery Usage" of my application is listed as some insanely >> >> high value (e.g., 40%). Over the same two hour period of the test, >> >> CPU usage was less than 3 seconds. >> >> >> >> What does "battery usage" mean? In my case, it clearly isn't an >> >> indication of "battery drain", but that is what the stat seems to >> >> imply. >> > > >> > >> >> > > > > -- > Dianne Hackborn > Android framework engineer > [email protected] > > Note: please don't send private questions to me, as I don't have time to > provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them. > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
