According to this answer, locating the method causing memory leak is pretty simple with the help of Instruments.
But in my situation, the "extended detail" column doesn't show any of my custom methods, as shown below:
How should I locate the leak point now?
Thanks,
snakeninny
The key is to launch Instruments via Xcode -> Product -> Profile. And then choose Leaks manually, you'll be able to see all the leaking symbols now.
I am implementing a simple application for iOS 6.1 and above
I am using iOS SDK 6.1 and ARC enabled in my project.
when I run analyze inside the xCode it doesn't find anything , but when I transferred my app(simulator) to instruments it found a leak of 128 bytes called
Malloc 128 bytes 0x7f95724139d0
the question is: How do I know where it happens inside my application
I did read this https://developer.apple.com/library/mac/documentation/developertools/conceptual/instrumentsuserguide/MemoryManagementforYouriOSApp/MemoryManagementforYouriOSApp.html
But when I click on cycle it is empty :( ,
also StackTrace says :
"No stack trace available for this leak;it maybe allocated before the
Allocation instrument was attached.
However I started the instruments before I run my app .
I guess I am doing something wrong here,
Can someone please help finding the part of code that causing leak?
Run your app on an actual device and then check again.
I have seen "phantom" leaks from the simulator before.
You should always test performance and memory issues on a real device rather than the simulator.
Note that a once-per-lifetime leak of 128 bytes is like a sink faucet that leaks a single drop of water after it's turned off. It's totally insignificant and can be safely ignored. The only time a leak that small is a concern is when it happens over and over. Like every time through a loop. In that case a 128 byte leak would be bad.
In a certain (consistent) point when my app is running, I consistently get the xcode error message
Terminated due to memory error.
I cannot find the code causing the error, but I can tell what code is near the error (using breakpoints).
The error is caused directly after returning a certain cell in my implemenation of the
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
UITableViewDataSource delegate method. I can confirm that it is returning a valid UITableViewCell, but I think that explaining and posting that entire method would be a waste of your time. However, I suspect it might be caused by a rapid, massive allocation of memory.
It definitely says Terminated due to memory error, not memory pressure.
I would like to know what is message really means. Also, is there any way to debug this message? No crash report is generated.
I am using ARC and iOS 7.
I was getting this error and could not understand what was wrong.
After some searching I found out that i forgot to disable zombies.
To disable do the following:
I was faced the same issue.("Terminated due to Memory Error")
I had tried the above all answers but nothing work for me. Then i debug my code and found a for loop is running for infinity time with allocating memory to a array with nil value every time.its use 300+MB so it give this error
Thanks.
I had exactly same issue. I thought it caused my program had memory leak or using too much memory. I use instruments and used allocating profile and program works fine. Also I ran program by device long enough, and it also works fine.
I also using iPad 3rd Gen for debugging, it might be causing because of that slow of the device or bug, it it seems like just Xcode and running from Xcode problem. Not the problem of memory leak or allocation.
If you make sure with instruments and running app on device itself and work
I was using Tesseract for OCR and when my target text got scanned, a GIF was supposed to play. When the GIF started to play, there was a memory spike, from 70-80MB to 450MB. The problem was that GIF was taking too much memory, the app would crash and Xcode would show that message. So I removed the concerned imageView from the superview of the ViewController.
imageView.removeFromSuperview
After this, the app would still spike to 450MB but then immediately release and come down to 40MB
Restart device worked for me. “Terminated due to memory error” message stopped to appear.
Edit the scheme, under Diagnostics you'll find several options to guard allocations. Refer to the documentation for details.
Question is: does it really say "terminated due to memory error" and not "pressure"? Check in instruments if your app is running low on memory, if the app does seem to run low on memory then that's what you should focus on regardless what the exact message is.
I got this error because I was adding full size photos to a collectionView cell sized 40x40. Read the 2 comments under the question from #matt. I had to scale down the images before adding them to the cell.
I had similar issue in Xcode 11.3 wherein camera was getting calling every-time we press on try again button. If these is done multiple times then crash happens.
This was fixed when we disabled Zombie objects. Below are steps:
Tap on project name present in top left. This will show list of targets present in project.
Tap on Edit scheme
Select Run option -> Diagnostics -> Uncheck Zombie Objects.
Now, run your project. It should work fine.
With Xcode 11 it started my project in Debug mode. I am doing some image recording/editing/returning to the user and that is not something you can use in Debug. Once I turned to Release mode, all went well.
I've faced this kind of issue due to inattentiveness.
I've been calling a function, which adds imageView as subview in:
override func layoutSubviews() {
super.layoutSubviews()
}
This caused a huge memory usage, so be attentive to this sort of things!
The thing that I noticed is that when I run my app on the device through cable and leave it idle for a long time I will also get that error.
Apple do address this and it just might be that it feels like the app is idle and just kills it.
In my case it was a corrupted Image from the API which raised my memory from 100MB to 4.5 GB due to processing size it took to display on screen!
An infinite loop was the cause of the memory leak for me. I could see the memory in Xcode rising to 1,6 Gb at which point the app crashed. The app's memory usage should be in mb and not gb and it should be relativly stable. If it rises quickly, say 100 mb a second, there's definitely something wrong. If none of the suggestions above have worked, you should 1. check the memory usage of the app, and 2. if the usage is too high, look for loops you've recently added.
My app crashes (randomly by the way) when running on the device, the crash is not reproduce-able 100% of the time. But it only seems to occur on the device, not in the simulator.
When I run in the simulator with NSZombies I never see problems. Could someone shed some light into my points below.
Device has limited memory, maybe it's crashing because of this.
What would be considered a big memory allocation that would cause a crash?
Would memory leaks/big allocation cause a memory corruption?
All my crashes are always EXC_BAD_ACCESS but like I said, never happens on simulator so I can't run zombies. (or is there another way?)
Note I have also simulated low memory warnings on the simulator to see if that's causing issues.
This is driving me nuts. Any help would be appreciated.
I know where it crashes but I need to know which other classes released this object.
Override -[release] -[autorelease] and -[retain] for your object (or you could do this for NSObject if you didn't know which object), then log them, set breakpoints.
If you identify which object is being released at each point, add timestamps/ object IDs/retaincount to the log statement, then you might be able to throw all of the data into a spreadsheet and then to get the same sort of data that Instruments would give you.
Shame you have to build for 3.0. Almost nobody uses 3.x anymore, and ARC (while not a silver bullet for all issues) is way better than non-ARC.
Also here's a tip: delete the app from your simulator and reinstall it. I had an issue where some of my bundle resources were missing in my project but the Simulator was hanging onto them between builds. If you tried to load a .xib that is no longer in your project, I could see it crashing...
I am using Xcode's static analyzer to find out the potential leaks in my project and it's working absolutely fine. But, sometimes the analyzer is showing a potential leak even after releasing the object. I am finding it difficult to understand this outcome.
Memory leaks wont cause you any sort of problem except one.
If you have alot of memory leakage and the assigned memory for your app gets full then your app will crash. and except this situation your app will run perfectly fine. X-code's static analyzer is best for checking memory leaks before you run your code.
check this link too
Why should we release?