Memory Warnings
Memory Warnings
- Subject: Memory Warnings
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Wed, 08 Oct 2014 12:12:04 +0700
I have an app which sometimes receives: applicationDidReceiveMemoryWarning:.
Is there some rule, how much Ram use is ok? Like: not more than x KB, or: not more than y % of total Ram?
Is there a way for the app to find out how much memory it is currently using?
Is there a way for the app to find out how much memory e.g. an array of strings is using? (NSString might store the data in several formats: Utf-8, Utf-16 or whatever) + there might be some (hopefully small) overhead in both NSString and NSArray.
When I have a file of 100 KB and do:
myData = [NSData dataWithContentsOfFile:options:error: ];
myBytes = myData.bytes;
how much Ram am I now using? 100 KB or 200 KB? I.e. does "bytes" just return a pointer to some internal structure in NSData?
Would options = NSDataReadingMappedIfSafe be of some help?
Currently I am using (in a singleton class):
@property (nonatomic, strong) NSData *myData;
- (NSData *)myData
{
static dispatch_once_t justOnce;
dispatch_once( & justOnce, ^{ _myData = [NSData dataWithContentsOfFile:options:error: ]; } );
return _myData;
}
because several threads might need myData.
If I would (upon receiving a memory warning) release myData, I would never be able to get it back, would I?
How could I handle this case?
Gerriet.
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