Hi there, quick question about choosing the gpu i want to be my open cl device..
i have a GTX1080 in slot 1 with no displays and a 970 in slot 2 and it handles both my displays. Id like to use the 1080 for open CL.

Is this the correct command to add to my env file?

HOUDINI_OCL_DEVICENUMBER = 1

Thanks in advance

I think it relates to the slot number, but it's easy to test. The About Houdini under the help menu shows which OpenCL device is selected.

Aah, fantastic. Just what i was after. Thanks very much!!

hey, did it work with the “_DEVICENUMBER” in your case? When trying it I get
an “incorrect device number” exception in Houdini -
could you perhaps hint me on how to switch the buses instead of the slots?
(Got this crappy optimus notebook and it defaults to the intelHD as openCL device
on Win - while on Linux (same device, employing bumblebee) the nvidia card
is used for both (GL/CL), as desired + it´s about twice as fast.
Would love to get this working on Win too…),
thnx + cheers!

illusionistics
hey, did it work with the “_DEVICENUMBER” in your case? When trying it I get
an “incorrect device number” exception in Houdini -
could you perhaps hint me on how to switch the buses instead of the slots?
(Got this crappy optimus notebook and it defaults to the intelHD as openCL device
on Win - while on Linux (same device, employing bumblebee) the nvidia card
is used for both (GL/CL), as desired + it´s about twice as fast.
Would love to get this working on Win too…),
thnx + cheers!

Hi yes - HOUDINI_OCL_DEVICENUMBER = 0
worked perfectly for me

As Artye says: go to: help>about houdini>show details - to check and then try either 0 or 1 as device number.

Ok, will give it another try
thnx!

You'll need to use this:

HOUDINI_OCL_VENDOR=“NVIDIA Corporation”

where is the env file located in macOS ? It seems Houdini is using the IRIS pro for OpenCL instead of the nvidia card.

You can also try the hgpuinfo command-line tool for diagnosing these issues faster than the about box.

will list the current opencl device chosen


will list all of the available opencl devices.

johner
You can also try the hgpuinfo command-line tool for diagnosing these issues faster than the about box.

hgpuinfo -c

will list the current opencl device chosen

It is showing the IRISpro as the Opencl Device ( On a Retina MacBook pro )

How do I change it to Nvidia ?

EDIT : Nevermind, got it. Many of these things need to be GUI based.

Feel like I am cheating in a need for speed LAN game by changing the config file ;D

it really works with the command HOUDINI_OCL_DEVICENUMBER = 0（or 1,2,3…）, i have changed the GPU for Houdini, Thank you!

Hi, can someone help me with it please? I got an error:

“OpenCL Context error: CL_MEM_OBJECT_ALLOCATION_FAILURE error executing CL_COMMAND_WRITE_BUFFER on GeForce RTX 2080 (Device 0).

OpenCL Exception: clEnqueueWrite
OpenCL Exception: Integer overflow building index for packed array attribute. (-4)
OpenCL Exception: Integer overflow building index for packed array attribute.”

I have no idea how to solve this when I'm using water sim and whitewater sim. I'm new to Houdini.

Thank you guys.

anon_user_37409885
You'll need to use this:

HOUDINI_OCL_VENDOR=“NVIDIA Corporation”

Thank you, this helped!
Otherwise it used motherboards built-in card.