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Subject: Performance problem with satellite modules (possibly caching)
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Author Messages
Rodney Joyce
Posts:102
Diamond Member

03/12/2008 7:51 PM  
Hi,

I have a weird performance issue - basically I have my main poker video gallery here, and I have various "Latest Video" (or Popular Vids) on other pages, for example, this Poker Bluffing Page and my home page.

As soon as I added this view, I could no longer navigate to the page as an unauthenticated users in IE. My Admin user works fine in FF, but I noticed the site recycled the IIS process. I then made the Latets Vid module viewable by admin only, and the user could get to this page again. I then made it visible to All Users again and set caching to 0 (the videos don't change often, so it's important I can cache the list, expecially on the home page - this gets hit a lot each minute so there's no point in reading from the DB each time).

Is this a known issue with the satellite modules?

Thanks
Rodney
PokerDIY - Free poker leagues
Rodney Joyce
Posts:102
Diamond Member

03/12/2008 7:53 PM  
Sorry, forgot links - main poker videos gallery, bluffing poker videos (with a Popular Videos Module set to Bluffing Category)

Thanks
Rodney
PokerDIY - Free poker leagues
Pengtsen R
Posts:5241


03/12/2008 9:50 PM  
a possible reason is the RotatedScreenshot token, please replace it to triditional SCREENSHOT token.

Pengtsen R
http://www.bizmodules.net
Rodney Joyce
Posts:102
Diamond Member

03/12/2008 10:03 PM  
Ok, will try. Can you please explain the difference? Also - can caching be used on these modules?

Thanks
Rodney
PokerDIY - Free poker leagues
Rodney Joyce
Posts:102
Diamond Member

03/12/2008 10:15 PM  
I just want to confirm that it is 100% the Caching setting that makes the page unreachable - even with [SCREENSHOT] (which I have now changed to on all views if it is better performance) it still timeouts in IE immediately if I make caching > 0, and then when I set it back to 0 it is reachable. I really need to cache these modules as they are on high-viewing pages (like my home page and forum page)

Thanks
Rodney
PokerDIY - Free poker leagues
Pengtsen R
Posts:5241


03/12/2008 10:22 PM  
well, I think the cache is irrlevant with UMG(and other modules), the cache is 100% implemented by DNN core.

Pengtsen R
http://www.bizmodules.net
Rodney Joyce
Posts:102
Diamond Member

03/12/2008 11:46 PM  
Hmmm - I was hoping you'd have some ideas as to why this does not work - does anyone else reading this use caching? I am not going to be able to put it on high-usage pages if I can't use it.

Pengtsen - can you please explain the difference between RotatedScreenshot and Screenshot? Which is better for performance?

Thanks
Rodney
PokerDIY - Free poker leagues
Pengtsen R
Posts:5241


03/13/2008 11:42 PM  
if you use RotatedScreenshot token, UVG will capture a series of screenshot(10 in default) from NEW videos in run time. in most case it takes a few seconds, if you use Screenshot token it just output the default screenshot which is catured when add it.

Rodney, do you have a test site? can you replicated this problem on the test site?

thanks.

Pengtsen R
http://www.bizmodules.net
Rodney Joyce
Posts:102
Diamond Member

03/16/2008 10:23 PM  
Ok, I have set it up like this on my test site, and it is doing the same thing. I have 5 users on my test site and 1 video (4.6.2). I added "Latest Videos" to the home page (leaving all the defaults, including caching to 0), and view the site with FF and Host. It works fine. I view it with a normal user and IE and it works fine too.

I then edit the module setting to 120 seconds, and it still works fine in FF and Host. IE now timesout and cannot reach the home page (this is on localhost, so it is not a connectivity issue).

Logging out in FF causes the same problem (so it is not a browser issue). I'm sure you can replicate this on any site by setting caching on any satellie view to greater than 0 (I'm sure you would want caching on these views anyway on a high usage site). Can someone please try this on their own site?

Thanks
Rodney
PokerDIY - Free poker leagues
Pengtsen R
Posts:5241


03/17/2008 7:34 AM  
basically, I think it is a problem of DNN itself, a module just care how to implement its functionalities and DNN is responsible to inject it to a page and handle cache issues.

I did a sample debug and I found when you log out DNN keeps loading the satelitte module and never stops.

when I have time I'll debug DNN to see why it keeps loading UVG satelitte modules, if you have time you can debug it by your self too.

thanks.

Pengtsen R
http://www.bizmodules.net
Rodney Joyce
Posts:102
Diamond Member

03/17/2008 9:03 PM  
Hmm - although caching is a core function, it is wierd the way the modules cease to work when caching is enabled (I have never seen any other module do this) - did you manage to replicate the timeout issue? I'll raise this on the core forums too but on a high usage site the satellite views would be unsuable without caching as it would casue a lot of SQL calls..

Thanks
Rodney
PokerDIY - Free poker leagues
Pengtsen R
Posts:5241


03/17/2008 10:20 PM  
yes, I was able to replicate it, as I said, DNN keeps loading the satelitte module(ucVideoListControl.ascx.vb -> BindData) and never finish.

I'll debug DNN core to see why it keeps loading it, if you have time you can debug it too.

thanks.

Pengtsen R
http://www.bizmodules.net
Rodney Joyce
Posts:102
Diamond Member

06/04/2008 10:34 PM  
Hi Pengtsen,

Just checking if you've managed to fix this in the latest versions? I really would like to enable caching on my homepage...

Thanks
Rodney
PokerDIY - Free poker leagues
Pengtsen R
Posts:5241


06/05/2008 5:39 AM  
no :(

I just found DNN keeps loading ucVideoListControl.ascx.vb -> Bind method but I don't know why.

by the way, you can try to install the latest DNN version on localtest to see if you still get this problem.

Pengtsen R
http://www.bizmodules.net
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Forums > Ultra Video Gallery > Support Questions > Performance problem with satellite modules (possibly caching)

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