VMD-L Mailing List

From: Bennion, Brian (Bennion1_at_llnl.gov)
Date: Wed Jul 28 2010 - 17:24:33 CDT

Hello John and Rich,

Some short background. These bad request errors occur every time our big iron gets kernel updates. This last update caused all my windows boxes to start throwing these errors just at startup without any molecule loaded and the logo spinning. If I load a protein into the session, then I get massive errors as it is displayed and they stop unless I start to rotate the molecule. The errors are different than for the spinning logo.
If I change the rep to licorice or CPK then the errors cease.

During the last kernel update my linux workstation completely garbled the vmd session so that I was only seeing dots. I did a complete system update and noticed some xorg stuff come through. After that I work seamlessly with my linux workstation in a remote connection with our big iron.

Rich,

The xwin32 builds are a bit confusing. My laptop is xwin32 9.0 B1097 while my other computers are at the latest version of xwin32 9.3 B1050 which is the latest the lab offers.
All the windows computers display the bad request errors as described above; even my laptop does when on site.

Brian

-----Original Message-----
From: Richard Cook [mailto:rcook_at_llnl.gov]
Sent: Wednesday, July 28, 2010 2:39 PM
To: John Stone
Cc: vmd-l_at_ks.uiuc.edu; Bennion, Brian
Subject: Re: vmd-l: VMD XRequest errors

Hi, thanks for your reply. Indeed, xwin32 error has definitely been my suspicion, but we'd like to know what is going on.
Brian, can you update xwin32 to the latest version to perhaps catch an X Server fix that might fix this?
The observation has been made that just starting vmd gives Xrequest.142 errors with 0x00046 endings. Visualizing a molecule with molecules viewed as lines creates hellacious number of errors. Changing the representation of the molecules to somethine other than lines stops all the Xrequest errors.
I'm keeping the vmd-l list in the Cc line, let me know if we should take this offline.

On Jul 27, 2010, at 9:58 PM, John Stone wrote:

>
> Richard,
> This is undoubtably caused by a flaw in the xwin32 implementation.
> Most of the X emulators out there fall a bit short when it comes to
> heavy duty OpenGL apps. It is difficult to postulate which X11 calls
> might be generating the errors, but if they are correlated with some
> particular activity within VMD, I might be able to help you track this
> down. If you load a molecule and just let it sit, do you still get
> errors? If you then rotate it, do the errors crop up with every
> OpenGL redraw? Are they associated with GUI activities or just
> drawing activity in the VMD OpenGL window?
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
> On Fri, Jul 23, 2010 at 04:47:49PM -0700, Richard Cook wrote:
>> Hello,
>> When VMD starts up on our cluster and displays back to certain machines on our network, we are seeing a huge number of errors on the console of the form:
>> XRequest.142 BadRequest (invalide request code or no such operation) 0x46
>>
>> Would someone on this list be able to help us determine the source of these errors? They do not occur when displaying back to every machine, just some running xwin32 on Windows XP.
>> --
>> ???Richard Cook
>> ??? Lawrence Livermore National Laboratory
>> Bldg-453 Rm-4024, Mail Stop L-557
>> 7000 East Avenue, Livermore, CA, 94550, USA
>> ??? (office) (925) 423-9605
>> ??? (fax) (925) 423-6961
>> ---
>> Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept.
>> (opinions expressed herein are mine and not those of LLNL)
>>
>>
>>
>
> --
> NIH Resource for Macromolecular Modeling and Bioinformatics
> Beckman Institute for Advanced Science and Technology
> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
> Email: johns_at_ks.uiuc.edu Phone: 217-244-3349
> WWW: http://*www.*ks.uiuc.edu/~johns/ Fax: 217-244-6078
> 

-- 
✐Richard Cook   
✇ Lawrence Livermore National Laboratory
Bldg-453 Rm-4024, Mail Stop L-557        
7000 East Avenue,  Livermore, CA, 94550, USA
☎ (office) (925) 423-9605    
☎ (fax) (925) 423-6961
---
Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept.
(opinions expressed herein are mine and not those of LLNL)