Re: [idvusers] running IDV in the XVNC and/XVBF

Howdy,

My contribution to the "Xvfb is poor on RHEL5" thread!

https://bugzilla.redhat.com/show_bug.cgi?id=498357

Unfortunately, we don't have a support contract with Red Hat, so it has been difficult to get their attention.

daryl

On Fri, 30 Jul 2010, Evan Lowery wrote:

Hi Yuan,

Do you know whether Vince's 64-bit installation was on a headless server?
We had previously experienced the issues that Vince described on a headless
64-bit CentOS server with an embedded ATI 16MB ES10000 internal card.

Regards,
Evan Lowery

-----Original Message-----
From: idvusers-bounces@xxxxxxxxxxxxxxxx
[mailto:idvusers-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Yuan Ho
Sent: Friday, July 30, 2010 3:52 PM
To: idvusers@xxxxxxxxxxxxxxxx
Cc: support-idv@xxxxxxxxxxxxxxxx
Subject: [idvusers] running IDV in the XVNC and/XVBF

Here is some information from a IDV user and it maybe useful to you:

Dear Yuan:

We have decided that Xvfb is simply broken in our 64-bit CentOS 5.5
environment. We have started running an instance of the Xvnc VNC server
to provide the Xserver we need for our batch programs and it works fine
for us. I would encourage others to try Xvnc if they have trouble with
Xvfb. The intended purpose of Xvnc is to run a virtual
X session to which users can connect over the network. We are simply
running it for the X server to support batch IDV programs, though we
could connect to the server from a VNC client, if necessary for debugging.

Here are some observations on the Xvfb issue:

We gave up on Xvfb after concluding that it is broken, at least
the version which is provided with CentOS 5.5. We suspect
that it was not ported correctly to a 64-bit environment.
Perhaps it makes invalid assumption about the sizes of
data types -- something that is likely to be critical
for a program which handles a complex binary protocol.

Some clues:

A user of IDV reported that he was able to use Xvfb in a
32-bit CentOS environment, but had no luck in a 64-bit installation.

valgrind reports many, many errors when I run Xvfb on mopfl,
but none when I run it on my personal 32-bit Fedora system.

Thanks for your help.

Regards,
Vince

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