Time of excessive latency of connection... Adobe Air supports on mobile connection pooling?

Hello

I'm developing a mobile application that loads the thumbnail images to a remote server. During testing on the Android platform, however, I discovered that the images are very long to load. By monitoring the server logs, I determined that poor performance is caused by the absence of connection pooling, which means that each request creates a new connection. Running the sample code below on a mobile device produces 20 applications and 20 attempts to connect. By comparison, the same web application or desktop creates 2 connections and reuses connections for the following applications. Important overhead and latency associated with generating new connections has a significant impact on performance, with 20 thumbnails taking about 4-5 seconds to load on mobile compared to 0.5-1 second on a desk.

I've included a sample application below the emphasis placed on the performance issue. The image itself is very small (290 bytes), to focus the issue on the latency of the connection. I confirmed this behavior on many Android devices running 4.1, 4.0 and 2.3. I also tried using the charger c. URLLoader v. URLStream and v. sequential loading with no change in the behavior of simultaneous connection. Trying to set up the connection to 'keep-alive' in the URLRequest has also no effect.

package

{

import flash.display.Loader;

import flash.display.Sprite;

import flash.display.StageAlign;

import flash.display.StageScaleMode;

import flash.events.Event;

import flash.net.URLRequest;

import flash.utils.getTimer;

SerializableAttribute public class Main extends Sprite

{

private var _count:int = 0;

public void Main()

{

Super();

internship. Align = StageAlign.TOP_LEFT;

stage.scaleMode = StageScaleMode.NO_SCALE;

trace ("Start time" + getTimer() + "ms");

var loader: Loader;

var url: String = " " http://fbcdn-profile-a.akamaihd.NET/static-AK/rsrc.php/v2/yo/r/UlIqmHJn-SK.gif "; 290 bytes

for (var i: int = 0; i < 20; i ++) {}

loader = new this.addChild (Loader()) as a charger.

loader.contentLoaderInfo.addEventListener (Event.COMPLETE, complete);

Loader.Load (new URLRequest (url));

}

private void complete(event:Event):void

{

_Count ++

trace ("Completed" + _count + 'to' + getTimer() + "ms");

}

So, I have a few questions:

(1) is there something I can do to allow the reuse of connection?

(2) is it an inherent limitation with Adobe Air for mobile?

(3) is that someone can confirm if this limitation exists on other mobile platforms (iOS or Blackberry)?

Any help you can provide would be greatly appreciated. I really hope that this isn't a fundamental limitation of Adobe Air because it weakens my application to feel very slow.

Thank you

Adam

Hmm. You were quite right, it's a little disappointing!

This is Android recompiled for 3.4 rather than 3.1.

null

OVER 50 with 8 Chargers in 11327 milliseconds or 226,54 by load. 50 8 11327 226,54

OVER 50 with 50 Chargers in 8899 milliseconds or 177,98 by load. 50 50 8899 177,98

OVER 50 with 50 Chargers in 9280 milliseconds or 185,6 by load. 50 50 9280 185,6

OVER 50 with 50 loaders in 9513 milliseconds or 190.26 per charge. 50 50 9513 190.26

OVER 50 with 8 Chargers in 9744 milliseconds or 194.88 by load. 9744 8 50 194.88

OVER 50 with 1 Chargers in 16383 milliseconds or 327.66 by load. 16383 1 50 327.66

Compared with Apple iPad recompiled for 3.4 rather than 3.1.

null

OVER 50 with 8 Chargers in 502 milliseconds or 10.04 per charge. 50 8 502 10.04

OVER 50 with Chargers of 50 to 100 milliseconds or 2 per load. 50 50 100 2

OVER 50 with 50 Chargers in 117 milliseconds or 2.34 per charge. 50 50 117 2.34

OVER 50 with 50 Chargers in 93 milliseconds or 1.86 per charge. 50 50 93 1.86

OVER 50 with 8 tires in 270 milliseconds or 5.4 per charge. 50 8 270 5.4

OVER 50 with 8 Chargers in milliseconds of 307 or 6.14 per charge. 50 8 307 6.14

OVER 50 with 8 Chargers in 316 milliseconds or 6.32 per charge. 50 8 316 6.32

OVER 50 with 4 Chargers in 555 milliseconds or 11.1 per charge. 50 4 555 11.1

OVER 50 with 4 Chargers in 547 milliseconds or 10.94 per charge. 50 4 547 10.94

OVER 50 with 4 Chargers in 535 milliseconds or 10.7 per charge. 50 4 535 10.7

OVER 50 with 2 Chargers in 1038 milliseconds or 20,76 by load. 50 2 1038 20,76

OVER 50 with 2 Chargers in 1042 milliseconds or 20,84 by load. 50 2 1042 20,84

OVER 50 with 1 Chargers in 2107 milliseconds or 42,14 by load. 50 1 2107 42,14

OVER 50 with 1 Chargers in 2099 milliseconds or 41,98 by load. 50 1 2099 41,98

Both are on the exit compilation, which should take all of the variability. So, Yes, it is as if the Runtime AIR 3.4 lost the pool of connections, but ONLY for Android.

PS: Code I used in my test (which was a view based Mobile application conventional) is below in case you want to include it when you submit a bug report.

http://ns.Adobe.com/MXML/2009.
xmlns:s = "library://ns.adobe.com/flex/spark" title = "TestLLatency" xmlns:mx = "library://ns.adobe.com/flex/mx" >

Import mx.events.FlexEvent;

protected function uicomponent1_creationCompleteHandler(event:FlexEvent):void
{
startTest();

}

public function startTest (): void {}
If (tail) throw new Error ("Please wait for the previous test at the end.");
queue = new Array();
_Count = 0;
var loader: Loader;
var i: int;
for (i = 0; i< numtoqueue;="" i++)="">
loader = new bob.addChild (Loader()) as a charger.
Loader.x = (I have 10%) * 50;
Loader.y = Math.floor (i/5) * 50;
loader.contentLoaderInfo.addEventListener (Event.COMPLETE, complete);
queue.push (Loader);
}
startTime = getTimer();
for (i = 0; i
nextQueue();
}
}
protected var startTime:int;
protected var endTime:int;
protected var numToQueue:int = 50;
protected var numLoaders:int = 8;
protected var queue: Array;
private var _count:int;
private void complete(event:Event):void
{
_Count ++
nextQueue();
}
[Bindable] protected var results: String;
protected function nextQueue (): void {}
var url: String = "http://fbcdn-profile-a.akamaihd.net/static-ak/rsrc.php/v2/yo/r/UlIqmHJn-SK.gif"; 290 bytes
if(queue && queue.) Length) {}
var loader: Loader = queue.pop () as a charger.
Loader.Load (new URLRequest (url));
} else {if(_count==numToQueue)
endTime = getTimer();
var last: int = endTime-startTime;
results += "\n" + ("COMPLETED" + numToQueue + "with" + numLoaders + "Chargers in ' + (elapsed) +" milliseconds or ' +(elapsed/numToQueue) + ' by load.\t"+[numToQueue,numLoaders,elapsed,elapsed/numToQueue].join("\t ' ""));
queue = null;
{while(Bob.numChildren>5)}
bob.removeChildAt(bob.numChildren-1);
}
bob.getChildAt (0) .addEventListener (MouseEvent.CLICK, repeatTest);
bob.getChildAt (1) .addEventListener (MouseEvent.CLICK, repeatTest);
bob.getChildAt (2) .addEventListener (MouseEvent.CLICK, repeatTest);
bob.getChildAt (3) .addEventListener (MouseEvent.CLICK, repeatTest);
bob.getChildAt (4) .addEventListener (MouseEvent.CLICK, repeatTest);
}
}
protected function repeatTest(event:MouseEvent):void {}
var dob:DisplayObject = event.target as DisplayObject;
var testBehaviour:int = dob.parent.getChildIndex (dob);
try {}
{Switch (testBehaviour)}
case 4:
this.numLoaders = this.numToQueue;
break;
case 3:
this.numLoaders = 8;
break;
case 2:
this.numLoaders = 4;
break;
case 1:
this.numLoaders = 2;
break;
case 0:
this.numLoaders = 1;
break;
}
startTest();
dob.removeEventListener (MouseEvent.CLICK, repeatTest);
for (var i: int = 0; i<5;i++)>
} catch(e:Error) {}
trace (e.message);
}
}

]]>

Tags: Adobe AIR

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