iphone - Why is my NSURLConnection so slow? -

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i have setup nsurlconnection using guidelines in using nsurlconnection mac os x reference library, creating nsmutableurlrequest post php script custom body upload 20 mb of data (see code below). note post body (line breaks , all) match existing desktop implementation.

when run in iphone simulator, post successful, takes order of magnitude longer if run equivalent code locally on mac in c++ (20 minutes vs. 20 seconds, respectively).

any ideas why difference dramatic? understand simulator give different results actual device, expect @ least similar results.

thanks

const nsuinteger kdatasizepost = 20971520; const nsstring* kuploadurl = @"http://www.someurl.com/php/test/upload.php"; const nsstring* kuploadfilename = @"test.data"; const nsstring* kusername = @"testuser"; const nsstring* khostname = @"testhost";  srandom(time(null)); nsmutabledata *uniquedata = [[nsmutabledata alloc] initwithcapacity:kdatasizepost]; (unsigned int = 0 ; < kdatasizepost ; ++i) {     u_int32_t randombyte = ((random() % 95) + 32);     [uniquedata appendbytes:(void*)&randombyte length:1]; }  nsmutableurlrequest *request = [[nsmutableurlrequest alloc] init]; [request seturl:[nsurl urlwithstring:kuploadurl]]; [request sethttpmethod:@"post"];  nsstring *boundary = @"abcdd"; nsstring *contenttype = [nsstring stringwithformat:@"multipart/form-data; boundary=%@",boundary]; [request addvalue:contenttype forhttpheaderfield: @"content-type"];  nsmutabledata *postbody = [nsmutabledata data]; [postbody appenddata:[[nsstring stringwithformat:@"--%@\ncontent-size:%d",boundary,[uniquedata length]] datausingencoding:nsutf8stringencoding]]; [postbody appenddata:[[nsstring stringwithformat:@"\ncontent-disposition: form-data; name=test; filename=%@", kuploadfilename] datausingencoding:nsutf8stringencoding]]; [postbody appenddata:[[nsstring stringwithstring:@";\ncontent-type: multipart/mixed;\n\r\n"] datausingencoding:nsutf8stringencoding]];  [postbody appenddata:[nsdata datawithdata:uniquedata]];  [postbody appenddata:[[nsstring stringwithformat:@"--%@\ncontent-size:%d",boundary,[kusername length]] datausingencoding:nsutf8stringencoding]]; [postbody appenddata:[[nsstring stringwithformat:@"\ncontent-disposition: inline; name=username;\n\r\n%@",kusername] datausingencoding:nsutf8stringencoding]]; [postbody appenddata:[[nsstring stringwithformat:@"--%@\ncontent-size:%d",boundary,[khostname length]] datausingencoding:nsutf8stringencoding]]; [postbody appenddata:[[nsstring stringwithformat:@"\ncontent-disposition: inline; name=hostname;\n\r\n%@",khostname] datausingencoding:nsutf8stringencoding]]; [postbody appenddata:[[nsstring stringwithformat:@"\n--%@--",boundary] datausingencoding:nsutf8stringencoding]];  [request sethttpbody:postbody];  nsurlconnection *theconnection = [[nsurlconnection alloc] initwithrequest:request delegate:self]; if (theconnection) {     _receiveddata = [[nsmutabledata data] retain]; } else {     // inform user connection failed. }  [request release]; [uniquedata release];

ok, there's couple of things wrong here.

  • you're generating 20mb of random data, take ages on ios device :)
  • you're keeping 20mb in memory, little memory intensive on ios device. you'd better off saving file.
  • you're setting body manually isn't necessary. i'd recommend using asiformdatarequest , not using nsdata , using asiformdatarequest's addfile:withfilename:andcontenttype:forkey:

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