Will Msieve (SVN 1043) work with CUDA 11.4 and an Arch 3.0 GPU? No!

[EdH]

When I installed the toolkit and CUDA from scratch in Ubuntu 20.04, they claimed to be 10.1. Even "NVCC --version" and NVIDIA-smi both showed 10.1. However, somehow the 10.1 has upgraded to 11.4 at some point.

Msieve builds without errors and tries to run, but has the following trouble:

$ ./msieve -g 0 -np -v
Msieve v. 1.54 (SVN 1043M)
Sun Jul 18 19:42:28 2021
random seeds: f434fda4 55303c82
factoring 442481795557623688831895262327430539285948212813785834989707204563288336300056437057 (84 digits)
searching for 15-digit factors
commencing number field sieve (84-digit input)
commencing number field sieve polynomial selection
polynomial degree: 4
max stage 1 norm: 1.61e+14
max stage 2 norm: 3.32e+13
min E-value: 7.30e-08
poly select deadline: 59
time limit set to 0.02 CPU-hours
expecting poly E from 1.39e-07 to > 1.60e-07
searching leading coefficients from 1 to 3114368
using GPU 0 (NVS 510)
selected card has CUDA arch 3.0
cannot load library 'cub/sort_engine.so': cub/sort_engine.so: cannot open shared object file: No such file or directory
error: failed to load GPU sorting engine from "cub/sort_engine.so"

Is this a problem with Msieve or CUDA?

[RichD]

You may have upgraded your software beyond the hardware supported driver levels. I've seen this before but don't recall the consequences. Others, more knowledgable, will give a better explanation.

[frmky]

You need to copy over not only the msieve binary but also the built CUDA libraries in their directories. Create a cub directory and copy sort_engine.so from your build ./cub directory to that one.

[EdH]

Originally Posted by frmky

You need to copy over not only the msieve binary but also the built CUDA libraries in their directories. Create a cub directory and copy sort_engine.so from your build ./cub directory to that one.

Thanks. I'm running in the original build directory, but I see that there is no sort_engine.so anywhere in the sub/directories, so I guess it didn't get built.

[EdH]

I manually ran the Makefile in the cub directory and now have sort_engine.so. I don't remember having to do that in the distant past and didn't note that step in the docs.

However, now I have a different error message:

. . .
using GPU 0 (NVS 510)
selected card has CUDA arch 3.0
deadline: 8640000 CPU-seconds per coefficient
error (line 1111): CUDA_ERROR_FILE_NOT_FOUND

"line 1111" in which file?

[EdH]

This is probably my answer:

$ make
"/usr/local/cuda-11.4/bin/nvcc" -gencode=arch=compute_30,code=\"sm_30,compute_30\" -DSM300 -o sort_engine.so sort_engine.cu -Xptxas -v -Xcudafe -# -shared -Xcompiler -fPIC -Xcompiler -fvisibility=hidden -I"/usr/local/cuda-11.4/bin/..//include" -I. -O3  
nvcc fatal   : Unsupported gpu architecture 'compute_30'
make: *** [Makefile:67: sort_engine.so] Error 1

When I simply used "make" in the cub directory, it defaulted to sm_52, so it built the wrong .so. The "make" driven by the main Makefile probably called the cub Makefile as designed and that failed, but didn't provide an error I could catch in the displayed stream.