iOS低内存崩溃，但内存使用率非常低 [英] iOS Low Memory Crash, but very low memory usage

问题描述

很长一段时间这让我烦恼。我的应用程序运行占用大约2.74MB的内存。没关系。但是当它创建一个UIWebView时，它会上升到大约5.87MB并继续崩溃。这些是在我的第一代iPad上运行时在仪器中的Live Bytes下给出的值。

This has been annoying me for a long time. My app runs taking up about 2.74MB of memory. That's fine. But then when it creates a UIWebView it goes up to around 5.87MB and proceeds to crash. Those are the values given under Live Bytes in Instruments while running on my 1st gen iPad.

我找不到崩溃日志。以下内容来自控制台：

There is no crash log that I can find. The following is from the console:

MyApp[1205] <Warning>: Received memory warning. Level=1
MyApp[1205] <Warning>: applicationDidReceiveMemoryWarning
SpringBoard[30] <Warning>: Received memory warning. Level=1
MobileMail[1199] <Warning>: Received memory warning. Level=1
configd[26] <Notice>: jetsam: kernel memory event (95), free: 428, active: 1853, inactive: 1011, purgeable: 338, wired: 15122
configd[26] <Notice>: jetsam: kernel termination snapshot being created
com.apple.launchd[1] <Notice>: (UIKitApplication:com.apple.mobilemail[0x8966]) Exited: Killed: 9
com.apple.launchd[1] <Notice>: (UIKitApplication:com.MyApp.MyApp[0xdd4f]) Exited: Killed: 9
SpringBoard[30] <Warning>: Application 'Mail' exited abnormally with signal 9: Killed: 9
kernel[0] <Debug>: launchd[1207] Builtin profile: MobileMail (sandbox)
SpringBoard[30] <Warning>: Application 'MyApp' exited abnormally with signal 9: Killed: 9
configd[26] <Debug>: CaptiveNetworkSupport:UIAllowedNotifyCallback:70 uiallowed: false
ReportCrash[1206] <Error>: libMobileGestalt loadBasebandMobileEquipmentInfo: CommCenter error: 1:45
ReportCrash[1206] <Error>: libMobileGestalt copyInternationalMobileEquipmentIdentity: Could not get mobile equipment info dictionary
ReportCrash[1206] <Error>: Saved crashreport to /Library/Logs/CrashReporter/LowMemory-2011-05-12-160645.plist using uid: 0 gid: 0, synthetic_euid: 0 egid: 0

我已经删除了对imageNamed的所有调用，将自动释放的内容更改为alloc /发布。但我无法弄清楚为什么会发生这种情况，这让我感到疯狂。

I have removed all calls to imageNamed, changed autoreleased stuff to alloc/release. But I cannot work out why this is happening and it's driving me insane.

感谢您的帮助！

推荐答案

您几乎肯定在使用比你想象的更多的记忆。

You are almost certainly using a lot more memory than you think.

你要做什么才能看到你的应用真正使用的东西并不明显，但是一旦你做了几次，你请记住。

It's not obvious what you have to do to see what your app is really using, but once you do it a couple times, you'll remember.

1. 使用Allocations性能工具运行。


2. 点击VM Tracker行在分配下（在屏幕截图中）


3. 点击自动快照

然后你会看到你的脏内存（我的屏幕截图目前是20.34MB）。

Then you will see your Dirty memory (currently 20.34MB in my screenshot).

这可以让你更好地了解你的应用程序退出的原因。你可能会发生一些大的泄漏事件。

This should give you a much better picture of why your app is getting quit. You probably hav some large leaking happening.

祝你好运！

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