如何减少CPU内存使用量？

Question

I am working on upload images application which seems working fine for me. I am uploading 100 images. and when i run this process 4-5 times application crashes out.

This seems to me memory usage issue.. How to reduce that memory. I don't want to my application get crashed.

 btn_Cancel.userInteractionEnabled=NO;
    btn_Share.userInteractionEnabled=NO;
    btn_Back.userInteractionEnabled=NO;
    btn_BackTransp.userInteractionEnabled=NO;
    btn_BareCode.userInteractionEnabled=NO;

    [self integratedLoaderView];



    NSURL *url=[NSURL URLWithString:@"http:/apiurl /"];
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),^{
        NSString *str_EstimateNumber=[NSString stringWithFormat:@"%@",txtFld_FolderName.text];
        NSDateFormatter *formatter=[[NSDateFormatter alloc] init];
        formatter.dateFormat=@"yyyy-MM-dd";
        string=[formatter stringFromDate:[NSDate date]];
        NSString *str_time;
        formatter.dateFormat=@"hh.mm.ss a";
        str_time=[formatter stringFromDate:[NSDate date]];
        NSString *str_AppendString=[NSString stringWithFormat:@"%@ at %@",string,str_time];
        NSInteger str_Counter=[[NSString stringWithFormat:@"%lu",(unsigned long)[delegate.ary_ImageData count]] integerValue];
        NSString *str_Value=[NSString stringWithFormat:@"%ld",(long)str_Counter];
        NSString *str_Username=[NSString stringWithFormat:@"%@/Images",txtFld_SelectedFTP.text];
        abc=0;
        for (int i=0;i<[ary_Tosend count]; i++)
        {

            sleep(0.6);

            abc++;
            if ([str_ConnectionStatus isEqualToString:@"WiFi"])
            {
            }
            if ([str_ConnectionStatus isEqualToString:@"Cellular"])
            {
            }
            if ([str_ConnectionStatus isEqualToString:@"No Connection"])
            {
                btn_Cancel.userInteractionEnabled=YES;
                btn_Share.userInteractionEnabled=YES;
                btn_Back.userInteractionEnabled=YES;
                btn_BackTransp.userInteractionEnabled=YES;
                btn_BareCode.userInteractionEnabled=YES;
                NSString *str_Total=[NSString stringWithFormat:@"%lu",(unsigned long)[ary_Tosend count]];
                NSString *str_Saved=[NSString stringWithFormat:@"%lu",(unsigned long)[delegate.ary_ImageData count]];
                NSInteger total_Count=[str_Total integerValue]-[str_Saved integerValue];

                [self saveInDBWhenConnectionLost:total_Count];

                [self ShowAlertForCheckInternetConnection];
                return ;
            }
            if ([str_ConnectionStatus isEqualToString:@""])
            {
                btn_Cancel.userInteractionEnabled=YES;
                btn_Share.userInteractionEnabled=YES;
                btn_Back.userInteractionEnabled=YES;
                btn_BackTransp.userInteractionEnabled=YES;
                btn_BareCode.userInteractionEnabled=YES;
                NSString *str_Total=[NSString stringWithFormat:@"%lu",(unsigned long)[ary_Tosend count]];
                NSString *str_Saved=[NSString stringWithFormat:@"%lu",(unsigned long)[delegate.ary_ImageData count]];
                NSInteger total_Count=[str_Total integerValue]-[str_Saved integerValue];

                [self saveInDBWhenConnectionLost:total_Count];
                [self ShowAlertForCheckInternetConnection];

                return ;
            }

            NSString *str_fileName;
            str_fileName=[NSString stringWithFormat:@"%@_%@ %i.jpg",str_EstimateNumber,str_AppendString,abc];
            NSDictionary *params=nil;
            NSData *imageToUpload=UIImageJPEGRepresentation([ary_Tosend objectAtIndex:i],0.25);
            NSString *encodedString=[NSString stringWithFormat:@"%@",[imageToUpload base64Encoding]];

            params= @{
                     @"categoryName" :txtFld_Category.text,
                     @"folderName"   :txtFld_FolderName.text,
                     @"fileName"     :str_fileName,
                     @"userName"     :str_Username,
                     @"postedFile"   :encodedString,
                     @"accessToken" :@"Q)4%v59!@lyr"
                     };

            AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
            httpClient.parameterEncoding = AFFormURLParameterEncoding;
            [httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];
            [httpClient setDefaultHeader:@"Accept" value:@"application/json"];
            NSMutableURLRequest *request=[httpClient requestWithMethod:@"POST"
                                                                  path:@"UploadImages/upload"
                                                            parameters:params];

            NSURLResponse* response=nil;
            NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
            if(data.length)
            {
                NSString *responseString=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                NSError *error = nil;
                NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];

                if(responseString && responseString.length)
                {
                    [delegate.ary_GetUploadedCount addObject:JSON];
                    [self responseUpload:JSON];
                    dispatch_async(dispatch_get_main_queue(),
                                   ^{
                                       if(i < delegate.ary_ImageData. count)
                                       {
                                           [delegate.ary_ImageData removeObjectAtIndex:i];
                                           [delegate.ary_TotalImages removeObjectAtIndex:i];
                                           [ary_DataToConvert removeObjectAtIndex:i];
                                           [ary_DataToConvert1 removeObjectAtIndex:i];

                                           NSUserDefaults *default_AllImg=[NSUserDefaults standardUserDefaults];
                                           [default_AllImg setValue:ary_DataToConvert forKey:@"ImageDetail"];
                                           [default_AllImg synchronize];

                                           NSUserDefaults *default_AllImg1=[NSUserDefaults standardUserDefaults];
                                           [default_AllImg1 setValue:ary_DataToConvert1 forKey:@"ImageData"];
                                           [default_AllImg1 synchronize];
                                       }
                                   });
                }
            }
        }
    });

Please tell me.

Answer 1

Make sure you factor your code so that you load an image into memory, upload it, and then release it. Don't build an array of all the images in memory at once.

If you've done that you might still have an autorelease problem.

You might try adding an auto release pool inside your loop:

for (NSString *filename in filenames)
{
  @autoreleasepool
  {
    //Your code to load an image and upload it to the server goes here
  }
}

However, it's a bit hard to give more specific help until you post your code.

EDIT

You are using NSURLConnection . That class has been deprecated. Use NSURLSession instead. That's not the cause of your problem. The cause of your problem is that your are queuing up 100 connections at the same time, with all of their data in memory.

You should use NSURLSession and an upload task. With an upload task you just provide a URL to the file and the system takes care of uploading it for you (and manages the memory for you.)