Re: xml object memory issue
Re: xml object memory issue
- Subject: Re: xml object memory issue
- From: XiaoGang Li <email@hidden>
- Date: Fri, 30 Oct 2009 16:21:28 +0800
thanks very much.
On Fri, Oct 30, 2009 at 3:39 PM, Kai Brüning <email@hidden> wrote:
>
> On 30.10.2009, at 08:36, Roland King wrote:
>
> Autoreleased objects are only autoreleased when the pool is drained. It is
>> more than likely that the XMLDocument initWithContentsOfURL makes a lot of
>> temporary objects which end up on the autorelease pool but they won't
>> actually be released until the end of your loop.
>>
>> Put another pool alloc at the start of your loop before the NSURL alloc
>> and then drain it after you release the xmlDocument - that will ensure all
>> temporaries created during the parse are destroyed.
>>
>
> Or switch to garbage collection. By far the better alternative unless you
> must support Tiger or iPhone.
>
> Kai
>
>
>> XiaoGang Li wrote:
>>
>>> The piece of code I want to discuss is followed:
>>> #import <Foundation/Foundation.h>
>>> int main (int argc, const char * argv[]) {
>>> NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
>>> for(int i=0;i<5000;i++)
>>> {
>>> NSURL *inAbsoluteURL = [[[NSURL alloc] initFileURLWithPath:@"the
>>> path to one xml file"] autorelease];
>>> NSError *error = NULL;
>>> NSXMLDocument *xmlDocument = [[NSXMLDocument alloc]
>>> initWithContentsOfURL:(NSURL*)inAbsoluteURL
>>> options:0
>>> error:&error];
>>> //hande my Xpath, and do check work. will not cosume the memory.
>>> [xmlDocument release];
>>> }
>>> [pool drain];
>>> return 0;
>>> }
>>> I used the Instruments to detect the objects created but still live until
>>> the application quit, I also use top command to check the memory usage.
>>> I found a lot of node, element, and other children object still live
>>> after
>>> the xmlDocument do release.
>>> I found that the memory usage of this application is increasing rapidly.
>>> Can any one give me a guilde to force the system to dealloc the memory
>>> during the for loop. I need to batch handle a lot of xml files. But after
>>> the application runs for a while,
>>> the system will crash because of no memory.
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