Multiple X servers + Multiple Cards + VirtualGL

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Jafaruddin Lie

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Oct 9, 2017, 6:35:35 AM10/9/17
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Hi all
Simple question is if it is possible, on a single machine with multiple GPUs, running different X servers on those GPUs, for multiple users to use vglrun at the same time?
This is our current setup:

1 machine with 4 Nvidia K80 cards (latest drivers), running CentOS 7, VirtualGL 2.5.2, TightVNC, and Mate Desktop.

We have 2 xorg.conf (2 cards configured on each xorg.conf), and currently we are testing whether we can bring up 2 desktop sessions via VNC.
The desktop loads, and we can see two different X servers running on those 4 cards and the VNC servers running on different displays.

The issue is with VirtualGL. The first user can do startx and run vglrun glxgears, this will work fine.
When the second user startx, the first user's vglrun session will be terminated with this error:

[VGL] ERROR: OpenGL error 0x0502
[VGL] ERROR: in readpixels--- 
[VGL] 439: Could not read pixels 

The first user can run vglrun again once the second user stops their X session.
My understanding is that with our setup, this should be do-able, right?

Thanks.

DRC

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Oct 9, 2017, 2:12:38 PM10/9/17
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Yes, it is possible. You don't actually even need multiple X servers
for multiple users to use VirtualGL at the same time. Multiple users
can share the same GPU using VirtualGL. That is one of its purposes.
In order to use VirtualGL with multiple GPUs, generally the easiest way
to do it is to configure a single X server with multiple screens, so GPU
0 would be accessible by setting VGL_DISPLAY=:0.0 and GPU 1 would be
accessible by setting VGL_DISPLAY=:0.1, etc. The reason why you are
getting the pixel readback error is because, unless the X server is
headless, it has to be attached to the physical display in order for
pixel readback to work. The only way to use VirtualGL with multiple X
servers (:0.0, :1.0, etc.) is if one or more of them is configured to be
headless. (https://virtualgl.org/Documentation/HeadlessNV explains how
to configure a headless X server with an nVidia GPU.)

Jafaruddin Lie

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Oct 9, 2017, 8:03:24 PM10/9/17
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Thanks, our xorg.conf is already set to headless according to that page.
Here's part of the section:

Section "Screen"
 Identifier "Screen0"
 Device "Device0"
 Monitor "Monitor0"
 DefaultDepth 24
 Option "UseDisplayDevice" "none"
   SubSection "Display"
   Depth 24
 EndSubSection
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Tesla K80"
    BusID          "PCI:0:6:0"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

I'll test it with a single X instance and see how we go.
The reason we want to have multiple X is that these desktop sessions are started by a job controller (user will submit their request for a desktop, which includes starting X).
We would like the X server to be killed whenever a user finishes their job, but one step at a time I suppose :)


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DRC

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Oct 9, 2017, 9:17:59 PM10/9/17
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You're missing the point. In a VirtualGL environment, there are two X
servers:

-- The "3D X server" is a shared resource. It is used by multiple users
simultaneously in order to access the GPU, so it needs to remain
running. It is only necessary to run one instance of the 3D X server,
although multiple GPUs can be assigned to different screens on that X
server. This allows VirtualGL to address the GPUs separately, which can
be useful for load balancing (assigning different users to different
GPUs) in large multi-user environments.

-- The "2D X server" (X proxy) is per-user and can be started/stopped as
needed. TurboVNC is our recommended 2D X server/X proxy solution, but
VirtualGL can also be used with other X proxy solutions, including
TigerVNC, Xpra, FreeNX, etc. The 2D X server receives and displays the
rendered 3D images from VirtualGL, as well as rendering the output of
other (non-3D) X applications. It is this X server that you would want
to start/stop using your job controller.

The basic purpose of VirtualGL is two-fold:

(1) To allow multiple users to share a single GPU (via the 3D X server
instance)
(2) To split 3D and 2D rendering to different X servers, so as to enable
hardware-accelerated OpenGL in an X proxy environment

The relationship between the 3D X server and the 2D X server is thus
one-to-many. Your test results made me remember a discussion about this
on the old virtualgl-users mailing list, and IIRC someone told me that
you have to disable the keyboard and mouse drivers in xorg.conf in order
for the 3D X server instance to be truly headless, i.e. for you to be
able to disconnect it from the console without encountering errors. Try
commenting out

InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"

and see if that changes the situation. If so, I'll add that to the
how-to on VirtualGL.org.
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Jafaruddin Lie

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Oct 9, 2017, 10:09:19 PM10/9/17
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Thanks, DRC.
I commented out the InputDevice(s) lines, now I have two VNC servers (from two different users) running on an instance of X on :0 (ps aux shows "X: 0")

The first user to login via the job controller is allocated the first two graphic cards, and this user has no issue running vglrun glxgears (just to test).
The second user is allocated the remaining graphic cards, and got this message:

[VGL] WARNING: The OpenGL rendering context obtained on X display
[VGL]    :0.3 is indirect, which may cause performance to suffer.
[VGL]    If :0.3 is a local X display, then the framebuffer device
[VGL]    permissions may be set incorrectly.

And this error from glxinfo:
name of display: :2
X Error of failed request:  GLXBadContext
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  6 (X_GLXIsDirect)
  Serial number of failed request:  43
  Current serial number in output stream:  43

That error persists with all the display number that I've tried (-d 0.0 to -d 0.3).
Is there anything I am missing from my X configuration here??

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DRC

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Oct 10, 2017, 12:14:14 AM10/10/17
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You are either still fundamentally misunderstanding how to configure a
VirtualGL server, or you are not describing your configuration properly.
"I have two VNC servers (from two different users) running on an
instance of X on :0" makes no sense. As I explained before, VNC is the
2D X server, not the 3D X server. xorg.conf is used to configure the 3D
X server. In a normal VirtualGL environment, :0.0, :0.1, :0.2, etc. are
screens on the 3D X server, each assigned to a different GPU. In a
normal VirtualGL environment, :1.0, :2.0, :3.0, etc. are X proxy/2D X
server instances.
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Jafaruddin Lie

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Oct 10, 2017, 12:34:05 AM10/10/17
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Thank you for your clarification.
See if I get this correct:
So what I have is two accounts connected to the same machine, each connected with two VNC sessions (the 2D X server) and this is working fine as I can see the desktops.
I have one 3D X server instance configured using xorg.conf, with 4 Nvidia GPUs and as far as I can tell from the document, this xorg.conf has been configured as headless.

My issue now, it seems, only one user is able to access the 3D X server properly. The other account, when running vglrun, will throw errors like 
[VGL] WARNING: The OpenGL rendering context obtained on X display
[VGL]    :0.3 is indirect, which may cause performance to suffer.
[VGL]    If :0.3 is a local X display, then the framebuffer device
[VGL]    permissions may be set incorrectly.

I am just trying to get the two accounts to use the 3D X server, so I was wondering if the issue lies with my xorg.conf or somewhere else?
Again, thank you for your replies. I am learning (albeit slowly).




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DRC

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Oct 10, 2017, 1:31:44 AM10/10/17
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Ah, OK. That sounds like a DRI permissions issue. Normally the DRI
device permissions will be set such that only the user who logged into
the X server will be able to use direct rendering. If you configure the
3D X server as recommended in the VirtualGL User's Guide, including:

-- Installing a display manager such as GDM and starting it when the
system starts
-- Running vglserver_config to grant limited access to the X server when
the display manager is active

this will automatically configure the DRI permissions appropriately for
nVidia GPUs. You will not be able to share the 3D X server if you start
it using startx. You need to configure the 3D X server as specified in
the User's Guide in order for it to be sharable.

DRC
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Kevin Van Workum

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Oct 10, 2017, 6:45:00 AM10/10/17
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I saw this happen with a similar setup in the past. It might have something to do with Xorg's VT's. Try starting Xorg with the '-novtswitch' option and specify a unique vt for each Xorg running.

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Jafaruddin Lie

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Oct 11, 2017, 9:43:34 PM10/11/17
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Thanks :)
I'll try this and report back.
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Jafaruddin Lie

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Oct 27, 2017, 12:57:01 AM10/27/17
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I promise a report back, and here it is.
The DRI permission issue was solved by running the vglserver_setup and running the VNC session outside of the job controller.
Running VNC inside the job controller, I am seeing the same issue, which makes me think this is an issue with cgroup.
Is there a pointer for working with virtualgl and cgroup?



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Oct 27, 2017, 1:00:16 PM10/27/17
to virtual...@googlegroups.com
VGL currently has no support for cgroups.  I do want to mention, however, that I provide commercial/enterprise support, consulting, and funded development services at reasonable hourly rates, and such a problem-- since it affects a specific commercial deployment scenario rather than a general use case-- would be an appropriate target for those professional services.
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