OMEGA ERROR: CUDA device not found! !

[thangBros]

Hi,
I followed all the instruction .
Then I got a message from Houdini Console said
OMEGA ERROR: CUDA device not found! !
nvFlex is not loaded.

What did I do wrong ?

[pedohorse]

I heard from a couple of people with the same error.
the error is caused by
NvFlexDeviceGetSuggestedOrdinal () from NvFlexDevice.h
for some reason it states that there's no CUDA device available, even though other CUDA applications seem to be working on that system

The problem has to be somewhere in the system, but i'm not sure where: old drivers? wrong cudart dll linking? i don't have access to a system with this bug, so i cannot debug it...

Maybe someone has experience with such flex/CUDA error?

P/S you can run deviceQuerry.exe (windows) (part of cuda toolkit) from the console and see the information it provides: like does you device support CUDA 8.0 or higher, just to be sure

[pedohorse]

if you are sure u have nvidia GPU that supports cuda with CC 3 or more, and you have the latest graphics drivers - you can try launching from wip branch, some launch issues were fixed there:
https://github.com/pedohorse/Houdini-NvFlex/tree/work-in-progress/x64

[JohnGemstone]

Yep I get the same using the wip branch.

FlexDevice: No Cuda device found !
OMEGA ERROR: Failed to initialize Cuda Context !
nvFlex is not loaded!

Below is a dump from deviceQuerry.exe. I haven't updated my drivers for a while so I will go and do that now and report back if it fixes the problem.

 CUDA Device Query (Runtime API) version (CUDART static linking)

Detected 1 CUDA Capable device(s)

Device 0: "GeForce GTX 1080 Ti"
  CUDA Driver Version / Runtime Version          9.1 / 8.0
  CUDA Capability Major/Minor version number:    6.1
  Total amount of global memory:                 11264 MBytes (11811160064 bytes)
  (28) Multiprocessors, (128) CUDA Cores/MP:     3584 CUDA Cores
  GPU Max Clock rate:                            1683 MHz (1.68 GHz)
  Memory Clock rate:                             5505 Mhz
  Memory Bus Width:                              352-bit
  L2 Cache Size:                                 2883584 bytes
  Maximum Texture Dimension Size (x,y,z)         1D=(131072), 2D=(131072, 65536), 3D=(16384, 16384, 16384)
  Maximum Layered 1D Texture Size, (num) layers  1D=(32768), 2048 layers
  Maximum Layered 2D Texture Size, (num) layers  2D=(32768, 32768), 2048 layers
  Total amount of constant memory:               65536 bytes
  Total amount of shared memory per block:       49152 bytes
  Total number of registers available per block: 65536
  Warp size:                                     32
  Maximum number of threads per multiprocessor:  2048
  Maximum number of threads per block:           1024
  Max dimension size of a thread block (x,y,z): (1024, 1024, 64)
  Max dimension size of a grid size    (x,y,z): (2147483647, 65535, 65535)
  Maximum memory pitch:                          2147483647 bytes
  Texture alignment:                             512 bytes
  Concurrent copy and kernel execution:          Yes with 2 copy engine(s)
  Run time limit on kernels:                     Yes
  Integrated GPU sharing Host Memory:            No
  Support host page-locked memory mapping:       Yes
  Alignment requirement for Surfaces:            Yes
  Device has ECC support:                        Disabled
  CUDA Device Driver Mode (TCC or WDDM):         WDDM (Windows Display Driver Model)
  Device supports Unified Addressing (UVA):      Yes
  Device PCI Domain ID / Bus ID / location ID:   0 / 1 / 0
  Compute Mode:
     < Default (multiple host threads can use ::cudaSetDevice() with device simultaneously) >

deviceQuery, CUDA Driver = CUDART, CUDA Driver Version = 9.1, CUDA Runtime Version = 8.0, NumDevs = 1, Device0 = GeForce GTX 1080 Ti
Result = PASS