100% CPU time on rad window maximize

[Marijana Cubra]

Hello,

We are facing strange behaviour of rad window.
When we force from server side code, that rad window is opened maximized on clinet load, IE(8) browser hangs taking 100% of CPU time. When window is restored to predefiend size, or minimized, it goes back to normal.

Also, if window is opened in predefined size on client side, and then maximized by client (manual action or script, whatever) it also hangs. However, after few manual repetions, it can stay maximized with normal CPU load.

This happens with several different rad windows we are using across our application.

Thanks for prompt reply!
Marijana

[Georgi Tunev]

Hello Marijana,

So far, the only case in which we have observed such behavior is when there was a RadSplitter on the page where the RadWindow is and that splitter was configured to 100% height. If this is your scenario too, just set overflow:hidden to page's form, body and html elements.
e.g.

html, body, form
{
   height:100%;
  margin:0;
  padding:0;
  overflow:hidden;
}

If your case is different, please open a support ticket and send us a sample project where the problem could be reproduced so we can investigate further.

Kind regards,
Georgi Tunev
the Telerik team

[Marijana Cubra]

Georgi,

Sample Project with description is at support ticket number 358594

Thanks
Marijana

[Georgi Tunev]

Hi Marijana,

I just answered your support ticket. I tried to reproduce the problem locally with the project that you sent me, but everything worked as expected. Please check the movie that I attached in the ticket and let me know if I missed something in the reproduction.


Best wishes,
Georgi Tunev
the Telerik team

[Marijana Cubra]

Hello Georgi,

I answered supoort ticket with video capturing behaviour at my machine.

I beleive that problem occurs on IE running on Windows 7 as client machine.

Here we as well. could't reproduce it on XP machine.
Real project is in environment with all Win7/IE8 client machines.

Kind regards,
Marijana

[Georgi Tunev]

Hello Marijana,

My tests were done on Windows 7 PC as well, but I don't believe that the problem is related to the OS - our controls are OS independent. I repeated the test and as you will see in the attached (in the ticket) movie, I am still unable to reproduce the problem (the jumping of the browser's page is due to the fact that I am using 2 monitors and you have a code that moves the browser to position 0,0).
This leads me to believe that the reason for the problem might be related to the browser itself - try your page on a different machine with clean IE or disable any third-party addons that interfere with the page.

Regards,
Georgi Tunev
the Telerik team

[Marijana Cubra]

Georgi,

we have performed more tests here and was able to reproduce problem on clean windows 7 machine, as well as on XP with IE 8.

It seems if parent window is also maximized, and upon opening/maximizing rad window, if there are no scrollbars on parent window, there is a problem! If we force with resizing to eventually get scrollbars on parent window, there is no problem!

However, we can't also catch the rule when parent page get scrollbars and when not. For example, if same page we open addressing web site with ip address of server, there are scrollbars at parent window, if we address by server's computer name, there are no scrollbars sometimes, after maximizing radwindow.  But again. there is no rule!
 I understand that from security point of view there is difference, but why in appearance of page?
Nevertheless, intention is not to have scrollbars anyway.

The fact is that we are able to reproduce this problem on our place as well as on all machines at customer site, tells me that some non standard add ons can not be a problem. here. Must be something else. Can not be that we all have same non standard things installed.

Let's please try to find asap where is the problem, as it becomes urgent. to resolve it.


Thanks and kind regards,
Marijana

[Marijana Cubra]

After some investigation, we found workaround for this issue.

It seems problem is with restricted zone defined for radwindow.
We use <div> for restricted zone. If height of <div> is not deifned, or defined with value > 97%, problem occurs!

So we specifed restricted zone to 97% height of desired area, and it works fine now.
Still don't understand why it doesn't work with 98% and 99%...

Marijana

[Georgi Tunev]

Hi Marijana,

It is good to know that you found a workaround for this problem. We are still unable to reproduce it locally, but we will continue our investigation and if something comes up, I will write here again. Indeed, it might has something to do with the scrollbars (as maximized RadWindow will try to hide the scrollbars on the page), but without investigating first, I cannot tell for sure.


Best wishes,
Georgi Tunev
the Telerik team

[Sebastien AUROUX]

hello
I think we have a similar problem, did you correct the bug that leads the CPU to be 100% in the recent release ?

We will try in parallel the tips and tricks you advice.

thanks for your help

[Marin Bratanov]

Hi Sebastien,

We have not been able to reproduce this behavior reliably, so I cannot confirm this issue is fully resolved. We are, however, constantly striving to improve our code and for the last two years many fixes have been incorporated, so I suggest that you upgrade to the latest version anyway.


Regards,
Marin
the Telerik team

[Victor]

Hi,

We found the issue occurs only with IE (in our case IE8) and when we're working with an URL-DNS call... by example:

http://mysite.mydomain.com/myAPP/page.aspx

When we try to reproduce the issue in a developer context, by expample: http://localhost/myAPP/page.aspx the CPU's weird behaviour is not present.

Hope this tip helps you to find a solution to this issue

Regards,
Vïctor.

[Sebastien AUROUX]

Apparently when i set overflow:hidden to page's form the problem is solved.
thanks for the solution, I would spend my week trying to understand.
sebastien

[Marin Bratanov]

Hello guys,

Thank you for the your time in investigating this scenario. I have forwarded this information to our dev team and I have also updated your Telerik points for your contribution. If a relation is found we will do our best to find and incorporate a fix for this.

All the best,
Marin
the Telerik team