nvcc fatal : Unsupported gpu architecture 'compute_20' while cuda 9.1+caffe+openCV 3.4.0 is installed

Question

I have installed CUDA 9.1+cudnn-9.1+opencv 3.4.0+caffe.

When I tried to run make all -j8 in caffe directory, this error occurred:

nvcc fatal : Unsupported gpu architecture 'compute_20'

I have tried to run:

"cmake -D CMAKE_BUILD_TYPE=RELEASE -D CUDA_GENERATION=Kepler .."

but it didn't work.

Answer 1

Try manually edit Makefile.config to remove compute_2* architectures from these lines (comments explain why):

# CUDA architecture setting: going with all of them.
# For CUDA < 6.0, comment the *_50 through *_61 lines for compatibility.
# For CUDA < 8.0, comment the *_60 and *_61 lines for compatibility.
# For CUDA >= 9.0, comment the *_20 and *_21 lines for compatibility.
CUDA_ARCH := -gencode arch=compute_20,code=sm_20 \
        -gencode arch=compute_20,code=sm_21 \
        -gencode arch=compute_30,code=sm_30 \
        -gencode arch=compute_35,code=sm_35 \
        -gencode arch=compute_50,code=sm_50 \
        -gencode arch=compute_52,code=sm_52 \
        -gencode arch=compute_60,code=sm_60 \
        -gencode arch=compute_61,code=sm_61 \
        -gencode arch=compute_61,code=compute_61

And add the compute_6* architectures (see the comments) so that your new CUDA_ARCH looks like this:

# CUDA architecture setting: going with all of them.
# For CUDA < 6.0, comment the *_50 through *_61 lines for compatibility.
# For CUDA < 8.0, comment the *_60 and *_61 lines for compatibility.
# For CUDA >= 9.0, comment the *_20 and *_21 lines for compatibility.
CUDA_ARCH := -gencode arch=compute_30,code=sm_30 \
        -gencode arch=compute_35,code=sm_35 \
        -gencode arch=compute_50,code=sm_50 \
        -gencode arch=compute_52,code=sm_52 \
        -gencode arch=compute_60,code=sm_60 \
        -gencode arch=compute_61,code=sm_61 \
        -gencode arch=compute_61,code=compute_61

Then you'll need to make clean before make all.

Answer 2

You can use cmake like following:

cmake [other_params] -D CUDA_ARCH_NAME="Pascal" ..

Answer 3

This fixed it for me

cd caffe && mkdir build && cd build && \
   cmake -DUSE_CUDNN=1 -DUSE_NCCL=1 -DCUDA_ARCH_NAME=Manual -DCUDA_ARCH_BIN="50 52 60 61" .. && \
   sudo make -j"$(nproc)"

Just dropped 20 and 30 arch support

Answer 4

Makefile.config is not used when compilation is done with cmake. Therefore removing compute_2* architectures from it doesn't solve the problem. Instead, you should edit caffe/Cuda.cmake. On line 9 just get rid of 20 21(20) on the list of known GPU architectures.