Blender/System Freeze. Cycles on "Viewport Shading/Render" when Compute Device is NOT the display device. #44094

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JPG · 2015-03-23T03:55:30+01:00

JPG commented

2015-03-23 03:55:30 +01:00

System Information
Debian Testing. Kernel 3.19.4/4.0.0rc2
2×GPU (GTX 580/750ti)
nvidia version 346.47
2×Multiple display setup 1 monitor for each GPU.

Blender Version
2.72.b+dfsg0-3 (debian)
2.73a (official)
2.74 RC2 (official)

Short description of error
System/Compute Device/CUDA allows for selecting any or multiple supported devices.
This works fine for rendering and there appears to be no problems as multiple GPU's are utilized for rendering purposes.
However, if Viewport Shading/Render is selected and the CUDA device(s) is not the main display or multiple devices that contains a device that is not the main display device - blender will crash.

I've tested this loading blender to display from either GPU and render to the non-display GPU with no problems unless "Viewport Shading/Render" is selected then blender will freeze (without errors) and at times a system freeze (if display != :0 and I can't kill blender).

Let me know if you require any further information.

Regards.
Joules.

Exact steps for others to reproduce the error
Any simple cycles render test.

**System Information** Debian Testing. Kernel 3.19.4/4.0.0rc2 2×GPU (GTX 580/750ti) nvidia version 346.47 2×Multiple display setup 1 monitor for each GPU. **Blender Version** 2.72.b+dfsg0-3 (debian) 2.73a (official) 2.74 RC2 (official) **Short description of error** System/Compute Device/CUDA allows for selecting any or multiple supported devices. This works fine for rendering and there appears to be no problems as multiple GPU's are utilized for rendering purposes. However, if Viewport Shading/Render is selected and the CUDA device(s) is not the main display or multiple devices that contains a device that is not the main display device - blender will crash. I've tested this loading blender to display from either GPU and render to the non-display GPU with no problems unless "Viewport Shading/Render" is selected then blender will freeze (without errors) and at times a system freeze (if display != :0 and I can't kill blender). Let me know if you require any further information. Regards. Joules. **Exact steps for others to reproduce the error** Any simple cycles render test.

JPG commented

2015-03-23 03:55:31 +01:00

Changed status to: 'Open'

JPG commented

2015-03-23 03:55:31 +01:00

Added subscriber: @joules-2

Sergey Sharybin commented

2015-03-24 09:05:45 +01:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-03-24 09:05:46 +01:00

I'm using mutliple videocards here on debian, and blender institute uses such a setups as well, so it'll be likely some specific setup..

Some questions:

Do you have any SLI birdges? If you do, it might have negative impact on Cycles.
Am i right you've got two monitors connected to different videocards?

I'm using mutliple videocards here on debian, and blender institute uses such a setups as well, so it'll be likely some specific setup.. Some questions: - Do you have any SLI birdges? If you do, it might have negative impact on Cycles. - Am i right you've got two monitors connected to _different_ videocards?

JPG commented

2015-03-24 09:39:18 +01:00

No SLI.
Just to make it a little more concise (and it also doesn't freeze down my entire system).
GTX 580 is connected to a display.
GTX 750ti is disconnected from a display.
The following scenarios is consistent.

Blender: Works as expected.
Compute Device/CUDA/Geforce GTX 580 + 750 Ti
Render/Device/GPU Compute
(Render) F12.
Note:
When Compute Device/CUDA/Geforce GTX 580 is set (display GPU).
Viewport Shading:Render+Cycles Render [Shift+z] also works as expected.

Blender: Fails - Blender Freezes. (KILL required)
Compute Device/CUDA/Geforce GTX 580 + 750 Ti OR Geforce GTX 750 Ti
Render/Device/GPU Compute
Viewport Shading:Render+Cycles Render [Shift+z]

Note: The opposite is also True (750Ti connected to a display 580 not).

Let me know if you require anything else.

- nvidia-settings: X configuration file generated by nvidia-settings
- nvidia-settings:  version 346.47  (buildmeister@swio-display-x86-rhel47-01)  Thu Feb 19 19:18:25 PST 2015

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "BenQ BL2710"
    HorizSync       30.0 - 88.0
    VertRefresh     50.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 580"
    BusID          "PCI:4:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

No SLI. Just to make it a little more concise (and it also doesn't freeze down my entire system). GTX 580 is connected to a display. GTX 750ti is disconnected from a display. The following scenarios is consistent. **Blender: Works as expected.** Compute Device/CUDA/Geforce GTX 580 + 750 Ti Render/Device/GPU Compute (Render) F12. **Note**: When Compute Device/CUDA/Geforce GTX 580 is set (display GPU). Viewport Shading:Render+Cycles Render [Shift+z] also works as expected. **Blender: Fails - Blender Freezes. (KILL required)** Compute Device/CUDA/Geforce GTX 580 + 750 Ti **OR** Geforce GTX 750 Ti Render/Device/GPU Compute Viewport Shading:Render+Cycles Render [Shift+z] **Note**: The opposite is also True (750Ti connected to a display 580 not). Let me know if you require anything else. ``` - nvidia-settings: X configuration file generated by nvidia-settings - nvidia-settings: version 346.47 (buildmeister@swio-display-x86-rhel47-01) Thu Feb 19 19:18:25 PST 2015 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "0" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor0" VendorName "Unknown" ModelName "BenQ BL2710" HorizSync 30.0 - 88.0 VertRefresh 50.0 - 76.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GTX 580" BusID "PCI:4:0:0" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "Stereo" "0" Option "nvidiaXineramaInfoOrder" "DFP-0" Option "metamodes" "nvidia-auto-select +0+0" Option "SLI" "Off" Option "MultiGPU" "Off" Option "BaseMosaic" "off" SubSection "Display" Depth 24 EndSubSection EndSection ```

JPG commented

2015-03-24 10:06:26 +01:00

Heres a screenshot of the freeze screen. This is with the 750Ti as the display GPU for this monitor and the 580 disconnected from any display or xscreen. I took this while testing if the opposite situation also caused a freeze (so it can't be specific to any GPU).
Regards.

Heres a screenshot of the freeze screen. This is with the 750Ti as the display GPU for this monitor and the 580 disconnected from any display or xscreen. I took this while testing if the opposite situation also caused a freeze (so it can't be specific to any GPU). Regards. ![blender_freeze_screen.png](https://archive.blender.org/developer/F154651/blender_freeze_screen.png)

JPG commented

2015-03-24 11:40:59 +01:00

Changed status from 'Open' to: 'Resolved'

JPG closed this issue

2015-03-24 11:40:59 +01:00

JPG self-assigned this 2015-03-24 11:40:59 +01:00

JPG commented

2015-03-24 11:40:59 +01:00

I can confirmed that disabling Vt-d (Intel ® VT for Direct I/O) within the bios resolves this bug for this particular system (Dell T7500).
Regards,
Joules.

I can confirmed that disabling Vt-d (Intel ® VT for Direct I/O) within the bios resolves this bug for this particular system (Dell T7500). Regards, Joules.

Sergey Sharybin commented

2015-03-24 15:00:47 +01:00

That's an interesting observation. We could now investigate it deeper once we've got access to such hardware :)

Thanks for the information and happy blending!

That's an interesting observation. We could now investigate it deeper once we've got access to such hardware :) Thanks for the information and happy blending!

Jędrzej Bulas commented

2015-04-21 11:53:36 +02:00

Added subscriber: @edekbul

Jędrzej Bulas commented

2015-04-21 11:53:36 +02:00

Hi,
I have similar or the same problem. I have two cards, GTX 660Ti(screen attached) and GTX 780Ti. View port is working only with 660Ti selected, any combination with 780Ti results in freeze. I have new Gigabyte GA-990FXA-UD5 motherboard and i have IOMMU setting on (same as Intel ® VTbut for AMD?). It is impossible to turn off IOMMU because all usb devices stop working with this option disabled (http://ubuntuforums.org/showthread.php?t=2143433&page=2). I need this option enabled for Xen also, so I would prefer to find workaround...

UPDATE
It turns out that it is possible to make:"GRUB_CMDLINE_LINUX="iommu=soft" in grub, and leave IOMMU option ON in Bios!. Now everything works well, USB ports, cycles, both cards in all configurations!!!:)

..."
sudo nano /etc/default/grub

input your password
then find the line that says: GRUB_CMDLINE_LINUX=""
then make it this: GRUB_CMDLINE_LINUX="iommu=soft"
save the file
then run this in the terminal:

sudo update-grub
"...

Hi, I have similar or the same problem. I have two cards, GTX 660Ti(screen attached) and GTX 780Ti. View port is working only with 660Ti selected, any combination with 780Ti results in freeze. I have new Gigabyte GA-990FXA-UD5 motherboard and i have IOMMU setting on (same as Intel ® VTbut for AMD?). It is impossible to turn off IOMMU because all usb devices stop working with this option disabled (http://ubuntuforums.org/showthread.php?t=2143433&page=2). I need this option enabled for Xen also, so I would prefer to find workaround... UPDATE It turns out that it is possible to make:**"GRUB_CMDLINE_LINUX="iommu=soft"** in grub, and leave IOMMU option ON in Bios!. Now everything works well, USB ports, cycles, both cards in all configurations!!!:) ..." sudo nano /etc/default/grub input your password then find the line that says: GRUB_CMDLINE_LINUX="" then make it this: GRUB_CMDLINE_LINUX="iommu=soft" save the file then run this in the terminal: sudo update-grub "...

JPG commented

2015-04-21 12:41:51 +02:00

Can you confirm that this issue does not present itself when IOMMU is disabled in the BIOS?

Jędrzej Bulas commented

2015-04-21 12:44:46 +02:00

When IOMMU is disabled in the BIOS my USB ports doesent work , including mouse and keyboard. I was not able to check if viewport work with IOMMU disabled. Now i have "GRUB_CMDLINE_LINUX="iommu=soft" and IOMMU enabled in bios and everything works well.

Jędrzej Bulas commented

2015-04-21 14:21:22 +02:00

With "GRUB_CMDLINE_LINUX="iommu=soft" set and IOMMU turned off in BIOS, viewport rendering is working fine. The only scenario when viewport rendering is not working is when you dont set "GRUB_CMDLINE_LINUX="iommu=soft" and HAVE IOMMU turned in BIOS ON.

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Blender/System Freeze. Cycles on "Viewport Shading/Render" when Compute Device is NOT the display device. #44094