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2014/10/15 ¤U¤È 10:03:34
iphone Programming Glossary: allocationsUITableView scrolling slow, memory leak issue http://stackoverflow.com/questions/10669139/uitableview-scrolling-slow-memory-leak-issue in all the cells then you will have to remove the remaining ones or hide them and there will be no way to avoid memory allocations. A better solution would be to insert a custom UIView inside your scroll view and draw all the texts manually instead of..
Why do weak NSString properties not get released in iOS? http://stackoverflow.com/questions/11107729/why-do-weak-nsstring-properties-not-get-released-in-ios share improve this question NSString uses all sorts of internal trickery to reuse objects and avoid unnecessary allocations and copies. It can do this because NSString instances are immutable. In this case there is probably a shared instance to..
Improving Finger Painting Performance http://stackoverflow.com/questions/1355527/improving-finger-painting-performance it . Old style C data structures are likely to be much faster for this because you can avoid all the retains releases allocations etc. There are other options though. Duplicate point checking would be much faster with an NSMutableSet if you pixel align..
Another iPhone - CGBitmapContextCreateImage Leak http://stackoverflow.com/questions/1434714/another-iphone-cgbitmapcontextcreateimage-leak to the returned CGImage rather than the CGImage itself. I too was having similar issues before with continual growing allocations and an eventual app crash. I addressed it by allocating a CGImage rather than a CGImageRef . After the changes run your.. I addressed it by allocating a CGImage rather than a CGImageRef . After the changes run your code in Insturments with allocations and you should not see anymore perpetual memory consumption from malloc. As well if you use the class method imageWithCGImage..
Clear MKMapView's cache of tiles? http://stackoverflow.com/questions/1917257/clear-mkmapviews-cache-of-tiles hard cap on how many can be allocated. In my app that number is 16 not sure if its based on UIView size or not. These allocations seem to be stringently managed and it responds to memory warnings. Anyway at a certain zoom level say continent level enough.. show off Los Angelas and as you pan around instead of just dumping those old tiles it puts them into the NSData store allocations where they seem to never get freed. This NSData store is the NSURLConnectionCache which exists by default only in memory...
Instruments ObjectAlloc: Explanation of Live Bytes & Overall Bytes http://stackoverflow.com/questions/2154219/instruments-objectalloc-explanation-of-live-bytes-overall-bytes select in the timeline. That will include leaked memory since leaked memory is never deallocated. #Living is how many allocations of a certain size object type happened and are still allocated . This is very useful when looking for leaks. For example..
How much memory can an iPhone app use? http://stackoverflow.com/questions/2299750/how-much-memory-can-an-iphone-app-use much memory can an iPhone app use Can anyone link me to a page that describes memory allocations for iPhone apps. I have heard that you are limited to a sandbox of ~20 megs depending on the state of the phone but I can't..
iPad/iPhone browser crashing when loading images in Javascript http://stackoverflow.com/questions/2986039/ipad-iphone-browser-crashing-when-loading-images-in-javascript Perhaps by freeing up memory or something else. I also came across this reference for UIWebView . JavaScript allocations are also limited to 10 MB. Safari raises an exception if you exceed this limit on the total memory allocation for JavaScript...
What do the colors and percentages mean in the Leaks Instrument? http://stackoverflow.com/questions/4283296/what-do-the-colors-and-percentages-mean-in-the-leaks-instrument in Table mode displays other useful information to help you spot potential allocation issues. The net versus overall allocations column of the table shows a histogram of the currently active objects and the total number that were ever created. As the.. shows a histogram of the currently active objects and the total number that were ever created. As the ratio of net allocations to overall allocations shrinks the color of the histogrambar changes. Blue histogrambars represent a reasonable ratio while.. the currently active objects and the total number that were ever created. As the ratio of net allocations to overall allocations shrinks the color of the histogrambar changes. Blue histogrambars represent a reasonable ratio while colors shifted towards..
(iphone) UIImage memory management problem http://stackoverflow.com/questions/4649695/iphone-uiimage-memory-management-problem I'm having trouble with UIImage memory management. iphone my app gets memory warning when instruments shows all allocations only 7mb Essentially I create destroy UIImage many times. Even if I make memory consumption at a time low using local NSAutoreleasePool..
Memory limit and iOS memory allocation in iphone SDK? http://stackoverflow.com/questions/6044147/memory-limit-and-ios-memory-allocation-in-iphone-sdk data structure allocation iphone ios4 memory management share improve this question Blocks from separate memory allocations are not allocated contiguously separate calls to alloc malloc new etc. . Otherwise they are allocated contiguously from..
http://stackoverflow.com/questions/6662730/nsnumber-vs-int tagged pointers and fast pathed cfnumber integers in . Where this can be used it saves you from slow operations like allocations locking and ref count ops. Nevertheless tagged pointers are incapable of representing every number and it introduces overhead..
http://stackoverflow.com/questions/7131014/check-retain-count
UITableViewCell's contentView's width with a given accessory type http://stackoverflow.com/questions/902096/uitableviewcells-contentviews-width-with-a-given-accessory-type you need to measure and then ask it how big its contentView is. Of course I would probably heavily cache this doing allocations when asking UITableView asks you for height information sounds to me like it would be slow check with a profiler first though..
UIImagePickerController does not release memory it occupies http://stackoverflow.com/questions/9662639/uiimagepickercontroller-does-not-release-memory-it-occupies seeing you need to make a little change. As shown in the image below you need to uncheck the option Only track active allocations to see the values you're looking for. If you still see 7.41 MB in Active allocations then the problem is something else...
http://stackoverflow.com/questions/2950907/uiwebview-memory-management view is rendered in memory. SO aside from the memory used to load the images and other data the stuff you see in the Allocations instrument the web view itself uses memory when it's rendered that you have no control over. So for example a 768x1024 webview..
iPhone - debugging “pointer being freed was not allocated” errors http://stackoverflow.com/questions/295778/iphone-debugging-pointer-being-freed-was-not-allocated-errors it reports the memory address of the object that is getting the extra release. Then Run with Performance Tool Object Allocations. This will bring up instruments. Look at the Console log as provided by Xcode organizer. Once you get the crash lookup the..
EXC_BAD_ACCESS on device, but fine on Simulator http://stackoverflow.com/questions/3583728/exc-bad-access-on-device-but-fine-on-simulator on the device it gives me an EXC_BAD_ACCESS when i attempt to scroll one page. I have ran it through Instruments with Allocations and Leaks but nothing is leaked and no zombies are messaged... i'm just curious what could cause such a difference in simulator..
Understanding the memory consumption on iPhone http://stackoverflow.com/questions/363493/understanding-the-memory-consumption-on-iphone application takes up about 14 MB of real memory. I am perplexed as where did the memory go when I dig into the Object Allocations most of the memory is in the textures exactly as I would expect. But both my own texture allocation counter and the Gart.. where I could allocate so much memory but with no results. What drives me wild is the difference between the Object Allocations ~7 MB and real memory usage as shown by Memory Monitor ~14 MB . Even if there were huge leaks or huge chunks of memory I.. ~14 MB . Even if there were huge leaks or huge chunks of memory I forget about the should still show up in the Object Allocations shouldn ™t they I ™ve already tried the usual suspects ie. the UIImage with its caching but that did not help. Is there a..
What do the colors and percentages mean in the Leaks Instrument? http://stackoverflow.com/questions/4283296/what-do-the-colors-and-percentages-mean-in-the-leaks-instrument no. 2 The Leaks instrument examines a process ™s heap for leaked memory. You can use this instrument together with the Allocations instrument to get memory address histories. This instrument requires that you launch a single process so that it can gather..
How to format Facebook/Twitter dates (from the JSON feed) in Objective-C http://stackoverflow.com/questions/4329485/how-to-format-facebook-twitter-dates-from-the-json-feed-in-objective-c
(iphone) UIImage memory management problem http://stackoverflow.com/questions/4649695/iphone-uiimage-memory-management-problem would not tell the story. What does tell the story is the number of live UIImage instances at a given moment. In the Allocations instrument using the top right search box search for Image . Then look for the column labeled #linving in UIImage. That..
What do “Dirty” and “Resident” mean in relation to Virtual Memory? http://stackoverflow.com/questions/5176074/what-do-dirty-and-resident-mean-in-relation-to-virtual-memory and Resident as relates to Virtual Memory And for bonus points what the heck is Virtual Memory anyway I am using the Allocations VM Tracker tool in Instruments to analyze an iOS app. Hint try to explain as if you were talking to an 8 year old kid or..
instruments with iOS: Why does Memory Monitor disagree with Allocations? http://stackoverflow.com/questions/5518918/instruments-with-ios-why-does-memory-monitor-disagree-with-allocations with iOS Why does Memory Monitor disagree with Allocations As can been seen in this screen shot from instruments Allocations thinks my application Ongo is only using 7.55 MBs of.. with iOS Why does Memory Monitor disagree with Allocations As can been seen in this screen shot from instruments Allocations thinks my application Ongo is only using 7.55 MBs of memory while Memory Monitor says 53.30. Further more the free system..
iOS Low Memory Crash, but very low memory usage http://stackoverflow.com/questions/5980636/ios-low-memory-crash-but-very-low-memory-usage you have to do to see what your app is really using but once you do it a couple times you'll remember. Run with the Allocations performance tool. Click the VM Tracker row under Allocations in the screenshot Click Snapshot Automatically Then you will.. you do it a couple times you'll remember. Run with the Allocations performance tool. Click the VM Tracker row under Allocations in the screenshot Click Snapshot Automatically Then you will see your Dirty memory currently 20.34MB in my screenshot ...
How to fix Allocations problem? http://stackoverflow.com/questions/6968521/how-to-fix-allocations-problem to fix Allocations problem I see this problem in instruments tool but dont know where is the problem. There are no leaks reports when I followed..
UIViewController retain count problem http://stackoverflow.com/questions/7483260/uiviewcontroller-retain-count-problem If you need to see where retains releases and autoreleases occur for an object use instruments Run in instruments in Allocations set Record reference counts on on you have to stop recording to set the option . Cause the picker to run stop recording..
Memory usage grows with CTFontCreateWithName and CTFramesetterRef http://stackoverflow.com/questions/8491841/memory-usage-grows-with-ctfontcreatewithname-and-ctframesetterref and where it is allocated but not where the extra retain comes from. To that turn on Record reference counts in the Allocations instrument and re run the test. This will allow you to inspect the backtraces of every retain release call on the offending..
How to activate Cycles reporting in Instruments under ARC? http://stackoverflow.com/questions/8852451/how-to-activate-cycles-reporting-in-instruments-under-arc Cycles view in Instruments by accident. Now where I started using ARC suddenly I'm not able to find that anymore. The Allocations and VM Tracker instruments don't offer it and the Leaks instrument either. What must I do in order to see retain cycles.. but I've had to root out several retain cycles that Leaks never found. For finding retain cycles I recommend using Allocations and running several heap shots between performing the action you suspect of 'leaking'. You then then look through the interim..
How do I verify reference count in ARC mode? http://stackoverflow.com/questions/8863269/how-do-i-verify-reference-count-in-arc-mode . If you need to understand where an object is being retained and released check out this answer for help using the Allocations instrument. However the retain count can be used to learn about the implementation of some classes. Only do this for entertainment..
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