Problem when the ios build download AssetBundle via WWW.LoadFromCacheOrDownload

Hello.

I recently experience unexpected black out for running the ios build. The situation of this issue is mostly
identical with following post.

http://answers.unity3d.com/questions/486445/problem-when-loading-many-assetbundles-use-www-cac.html

It used to work fine before and works fine in Android, but it just starts happening in iOS. First, I presents the partial code.

--------Code calling WWW.LoadFromCahceOrDownload---------------------------

while (!Caching.ready)
yield return new WaitForSeconds(0.01f);

WWW downloadWWW =
WWW.LoadFromCacheOrDownload(myNeedToDownloadList[index].DownloadURL
#if !UNITY_EDITOR // Using nocache in UnityEditor causes unexpected termination of UnityEditor
+ "?nocache=" + SystemConfig.GetCurServerTime()
#endif
, myNeedToDownloadList[index].Version);

myPassedTimeForOneDownload = 0f;
// Waiting to finish download file
while (!downloadWWW.isDone)
{
myPassedTimeForOneDownload += Time.deltaTime;

// Signal of the internet disconnected
if (myPassedTimeForOneDownload < 0f)
{
break;
}
// Possible WWW timeout. Check the internet connection
else if (myPassedTimeForOneDownload > SystemConfig.WWW_TIMEOUT)
{
// TODO: Replace to the generic network connectibility checking solution
// Calling to Server to check internet connectibility
ClientNetwork.CHECK_VERSION(this);
myPassedTimeForOneDownload = 0f;
}

yield return new WaitForSeconds(SystemConfig.TIME_WAIT_INTERVAL);
}
---------------------------------------------------------

-------------------- XCode Logs from iPhone 4 --------------------
// From the almost end of download assetbundle files(total number is around 250 files)
starting www download: http://XXX.XXX.XXX/AssetBundles_iPhone/zones/DEVIL_02.nta?nocache=1417069983

Failed to open file at path: /var/mobile/Applications/4FEFF803-086C-4A67-BA63-5ED15B13A8C6/Library/UnityCache/Temp/abc7d305857e2484d85215384329ebfd/CAB-88261ce3fdef04a94b1c84d8a22be2a4

(Filename: Line: 294)

Failed to open file at path: /var/mobile/Applications/4FEFF803-086C-4A67-BA63-5ED15B13A8C6/Library/UnityCache/Temp/abc7d305857e2484d85215384329ebfd/CAB-88261ce3fdef04a94b1c84d8a22be2a4

......................
// After finishing to download all assetbundle files with previous error messages
Could not open file /var/mobile/Applications/4FEFF803-086C-4A67-BA63-5ED15B13A8C6/puzzlehench.app/Data/level3 for read


(Filename: Line: 136)


Could not open file /var/mobile/Applications/4FEFF803-086C-4A67-BA63-5ED15B13A8C6/puzzlehench.app/Data/unity default resources for read


(Filename: Line: 136)


Could not open file /var/mobile/Applications/4FEFF803-086C-4A67-BA63-5ED15B13A8C6/puzzlehench.app/Data/unity default resources for read


(Filename: Line: 136)


Could not open file /var/mobile/Applications/4FEFF803-086C-4A67-BA63-5ED15B13A8C6/puzzlehench.app/Data/sharedassets3.assets for read

// Then, everything goes to blackout, but I can hear playing BGM.
-------------------------------------------------------------

For more detail,

XCode version 6.1.1
Unity3D version 4.5.5
Build as strip by code

Finally, it's not crash, but it's not presenting any visuals.

Any clues will be very appreciate.


Thanks

Danny

 

Thanks ricardo_arango for reply.

I am sure that I call WWW.Dispose() for every WWW instances those I created.
However, my download system has option that keeps assetbundle into a List, so can load later.
And I enabled the option for the time when I encountered the error.

So, about 250 assetbundles are stored in the List and not unloaded.
Do you think this is the case why I encountered the error?

Danny

 

seno, that's likely what you're hitting. You get a total of 256 file handles I believe. Holding onto an asset bundle takes 2. You need to reduce the number of asset bundles you have loaded at once.

 

Hello, Alden.

First of all, thanks for confirming possible problem.

But, I double checked my download system and it turned out, it didn't unload only 5 ~ 10 assetbundles those
contains about 1024 x 1024 size icon atlases.

I am currently applying new way to handle download by request of my colleagues to minimize memory usage by
not to hold downloaded assetbundle and I will report more about this. later.

Thanks