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Misconceptions About iOS Multitasking
http://www.x404.co.uk/forum/viewtopic.php?f=4&t=15471		 Page 1 of 1
Author:  forquare1 [ Mon Jan 02, 2012 5:58 pm ]
Post subject:  Misconceptions About iOS Multitasking
A good explanation of iOS multitasking: http://speirs.org/blog/2012/1/2/misconc ... sking.html
Author:  forquare1 [ Fri Jan 06, 2012 6:25 pm ]
Post subject:  Re: Misconceptions About iOS Multitasking
And because he got a shed load of emails, he made a video showing how it happens:
http://speirs.org/blog/2012/1/6/ios-mul ... etail.html
Author:  big_D [ Sun Jan 08, 2012 9:05 am ]
Post subject:  Re: Misconceptions About iOS Multitasking
Yep, but it is those that do run in the background which cause the problems, like Skype, which can drain the battery in a couple of hours or navigation software. Those do need killing on a regular basis, if you need the battery to keep going through the whole day.
Author:  Fogmeister [ Sun Jan 08, 2012 11:40 am ]
Post subject:  Misconceptions About iOS Multitasking
big_D wrote:
Yep, but it is those that do run in the background which cause the problems, like Skype, which can drain the battery in a couple of hours or navigation software. Those do need killing on a regular basis, if you need the battery to keep going through the whole day.

hmm... Have you tested Skype when it's in the background. I'll have a look in instruments.


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I am here: http://maps.google.com/maps?ll=53.842557,-1.532729
Author:  big_D [ Sun Jan 08, 2012 1:24 pm ]
Post subject:  Re: Misconceptions About iOS Multitasking
Fogmeister wrote:
big_D wrote:
Yep, but it is those that do run in the background which cause the problems, like Skype, which can drain the battery in a couple of hours or navigation software. Those do need killing on a regular basis, if you need the battery to keep going through the whole day.

hmm... Have you tested Skype when it's in the background. I'll have a look in instruments.


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I am here: http://maps.google.com/maps?ll=53.842557,-1.532729

I hadn't used Skype for ages, then the iOS 4.3 update somehow automatically started Skype. My battery drained in about 4 hours. This went on for a day or so, with the phone being practically unusable and pretty much chained to a power supply. I then noticed that Skype had been started. I killed it and it went back to about 36 - 48 hours between charges.
Author:  forquare1 [ Sun Jan 08, 2012 5:51 pm ]
Post subject:  Re: Misconceptions About iOS Multitasking
It would appear that Skype behaives correctly, i.e. shortly after being backgrounded it is suspended (remaining in memory but taking no CPU time). if you get a text message or a call, Skype comes out of suspension, uses some CPU time, then goes back until you go back to the app or more messages come through. I guess Skype might be using push notifications to the app, which triggers the app to go and check for new stuff?

I only ran the app for five minutes, but it only appeared to use CPU time to receive calls/messages.
Author:  jonbwfc [ Sun Jan 08, 2012 8:47 pm ]
Post subject:  Re: Misconceptions About iOS Multitasking
There's one thing you're failing to take account of in your otherwise reasonable analysis. It is this : Dave's iPhone hates him.
Author:  forquare1 [ Sun Jan 08, 2012 9:16 pm ]
Post subject:  Re: Misconceptions About iOS Multitasking
jonbwfc wrote:
There's one thing you're failing to take account of in your otherwise reasonable analysis. It is this : Dave's iPhone hates him.


And his iMac....
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