How Find the Source of Memory Pressure in an iOS Application

Question

I was debugging an app on a device. It worked perfectly for some time and then stopped with the error message "App terminated due to memory pressure". There is no error or crash logs.

Why did this happen? How can i resolve this? My app uses 10 to 30 mb ram while running. Is that a lot?

UPDATE: after using instruments i got this.. can anybody explain memory allocation????

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UPDATE: i tried instruments and found leaks. i got some thing like this

i cant understand what does it mean and how to solve this????

Try using Instrument's Memory tools to find out what is using the most memory. — Linuxios, Nov 06 '13 at 16:03
Have you tried using Instruments? Specifically the Allocations Instrument? Doing that should lead you to the source of your problem. — Jonathan Arbogast, Nov 06 '13 at 16:03
In the Xcode menu bar, under 'Product,' there is a profile option. https://developer.apple.com/library/ios/recipes/xcode_help-scheme_editor/Articles/SchemeProfile.html — Mike D, Nov 06 '13 at 16:08

score 5 · Accepted Answer · edited May 23 '17 at 10:24

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I think 10 to 30 mb of app's memory usage is not an issue especially for latest model iOS devices (like iPhone 4 and 5), unless you have lot of other memory intensive apps running in background. They have 512mb to 1 GB RAM.

Diagnosis of issue -

To begin with, use memory graph in XCode 5. You may find this link useful.

Also, you may like to put breakpoints in didReceiveMemoryWarning method provided by UIViewController.

And, to further dig down, switch to profile your app. (Xcode menu Product > Profile and choose Allocations in the dialog). Here, you will find a good tutorial.

edited May 23 '17 at 10:24

Community

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answered Nov 06 '13 at 16:10

Ashok

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i am using core data db with my app. – Musadhikh Muhammed K Nov 06 '13 at 16:19
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Just added a tutorial link in my answer, which explains how to debug memory leaks. – Ashok Nov 06 '13 at 16:30
while ram usage is up to 40 mb cpu usage is up to 70 to 90% – Musadhikh Muhammed K Nov 07 '13 at 08:27

How Find the Source of Memory Pressure in an iOS Application

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