Re: NX client with root graphics

From: Stan Seibert <>
Date: Wed, 4 Oct 2006 16:37:26 -0500

Perhaps a better way to phrase it is:

NX crashes experienced today with QtRoot: 0 NX crashes experienced today with X11/Root: 3

Just now I found running benchmarks.C with X11/Root killed NX twice in a row, but not the third time. The argument that QtRoot fixes the problem is statistical without a 100% reproducible test case. Certainly, I don't think the ROOT developers should go looking for a solution to this NX issue...

Anyway, I post this mostly to let other NX users know that QtRoot appears to be a workaround for this NX bug.

Stan Seibert

On Oct 4, 2006, at 2:04 PM, Rene Brun wrote:

> Stan,
> I cannot understand your conclusion. My conclusion is that you
> cannot reproduce
> the problem that you initially reported ::) and from your original
> description, most of us understood that it was probably a problem
> with the software in your NX box.
> Let us know if you can reproduce the problem in a systematic way.
> Rene Brun
> Stan Seibert wrote:
>> To follow up:
>> After a few days of trying out the full QtRoot (with the
>> extensions) with 5.13.02, neither I nor the other NX user here
>> have observed any NX segfaults. Without a reliable testcase to
>> trigger the NX bug, it is hard to draw conclusions. Nevertheless,
>> the current evidence is that using the Qt layer fixes the problem.
>> Thanks for the suggestion! We'll keep using QtRoot to avoid this
>> NX issue in the future.
>> ---
>> Stan Seibert
>> On Sep 26, 2006, at 2:42 PM, Fine, Valeri wrote:
>>> Can you check you can reproduce this problem with Qt-layer ON ?
>>> I was enable to install NX for the "BNL cybersecurity reason" to
>>> check things myself
>>> Thank you.
>>> ________________________________
>>> From: on behalf of Stan Seibert
>>> Sent: Tue 9/26/2006 12:25 PM
>>> To: Otto Schaile
>>> Cc:; Klaus.Steinberger
>>> Subject: Re: [ROOT] NX client with root graphics
>>> On Sep 26, 2006, at 8:36 AM, Otto Schaile wrote:
>>>> Hi Rooters,
>>>> the NX technology ( see e.g.:
>>>> NX_technology) offers
>>>> a cheap and efficient access to a remote desktop (Linux) even at
>>>> low bandwidth (UMTS, GPRS).
>>>> E.g. firefox on a remote machine runs without problems.
>>>> However running root with graphics crashes the NX session
>>>> immediately or
>>>> after some time.
>>>> Has anybody out there experience with that?
>>> Yes, I have experienced the same problem with NX and ROOT. It seems
>>> to happen to me most often when ROOT is exiting and closing windows,
>>> although the bug is not deterministic. I have not yet figured out a
>>> sequence of events which always cause it.
>>> I assume it is an NX problem, but ROOT is the only program that
>>> triggers it in my experience.
>>> ---
>>> Stan Seibert
Received on Wed Oct 04 2006 - 23:37:41 MEST

This archive was generated by hypermail 2.2.0 : Mon Jan 01 2007 - 16:32:01 MET