loading a shared library (cuda) in python via ctypes, cannot dynamically load

Question

I have compiled my cuda script via the following command into a shared library :

nvcc --ptxas-options=-v --compiler-options '-fPIC' -o test_function.so mologram.cu

Then, in Python:

import ctypes
from numpy.ctypeslib import ndpointer

lib = ctypes.cdll.LoadLibrary('./test_function.so')

Throws the following error message:

OSError                                   Traceback (most recent call last)
<ipython-input-12-02ce09d7f391> in <module>()
      2 from numpy.ctypeslib import ndpointer
      3 
----> 4 lib = ctypes.cdll.LoadLibrary('./test_function.so')


/usr/lib/python2.7/ctypes/__init__.pyc in LoadLibrary(self, name)
    438 
    439     def LoadLibrary(self, name):
--> 440         return self._dlltype(name)
    441 
    442 cdll = LibraryLoader(CDLL)

/usr/lib/python2.7/ctypes/__init__.pyc in __init__(self, name, mode, handle, use_errno, use_last_error)
    360 
    361         if handle is None:
--> 362             self._handle = _dlopen(self._name, mode)
    363         else:
    364             self._handle = handle

OSError: ./test_function.so: cannot dynamically load executable

I have done similar scripts in the past and never encounter this error. I am baffled as to why this error message appears.

Any input appreciated

You can't load the shared library because it isn't a shared library... — talonmies
– talonmies, Commented Mar 24, 2017 at 15:06

2 revs · Accepted Answer · 2017-03-24 15:39:11Z

2

I have compiled my cuda script via the following command into a shared library

nvcc --ptxas-options=-v --compiler-options '-fPIC' -o test_function.so mologram.cu

But you haven't. That only compiles mologram.cu to an object file. If you consult the documentation, you will see that shared library compilation and linkage requires the --shared option. So

nvcc --ptxas-options=-v --compiler-options '-fPIC' --shared -o test_function.so mologram.cu

is probably what you want to do.

edited Mar 24, 2017 at 15:39

community wiki

2 revs
talonmies

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