皮库达：可以导入模块，那我就不能。。。（皮库达样品）

Question

示例代码：

import pycuda.autoinit
import pycuda.driver as drv
import numpy

from pycuda.compiler import SourceModule
mod = SourceModule("""
__global__ void multiply_them(float *dest, float *a, float *b)
{
  const int i = threadIdx.x;
  dest[i] = a[i] * b[i];
}
""")

multiply_them = mod.get_function("multiply_them")

a = numpy.random.randn(400).astype(numpy.float32)
b = numpy.random.randn(400).astype(numpy.float32)

dest = numpy.zeros_like(a)
multiply_them(
        drv.Out(dest), drv.In(a), drv.In(b),
        block=(400,1,1), grid=(1,1))

print dest-a*b

结果：

Traceback (most recent call last):
  File "test.py", line 12, in <module>
    """)
  File "build/bdist.linux-x86_64/egg/pycuda/compiler.py", line 238, in __init__
  File "build/bdist.linux-x86_64/egg/pycuda/compiler.py", line 223, in compile
  File "build/bdist.linux-x86_64/egg/pycuda/compiler.py", line 149, in _find_pycuda_include_path
ImportError: No module named pycuda

听起来很简单，让我们来测试一下。

Python 2.7.1 (r271:86832, Feb 17 2011, 14:13:40) 
[GCC 4.3.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pycuda
>>> pycuda
<module 'pycuda' from '/home/abolster/lib/python2.7/site-packages/pycuda-0.94.2-py2.7-linux-x86_64.egg/pycuda/__init__.pyc'>
>>> 

好吧，那很奇怪。。。

长话短说，即使逐行进入python控制台中的文件，在实际执行mod=SourceModule（）之前也不会出错。

（我保证最后的追溯）

/home/abolster/lib/python2.7/site-packages/pycuda-0.94.2-py2.7-linux-x86_64.egg/pycuda/compiler.pyc in _find_pycuda_include_path()
    147 def _find_pycuda_include_path():
    148     from imp import find_module
--> 149     file, pathname, descr = find_module("pycuda")
    150 
    151     # Who knew Python installation is so uniform and predictable?

ImportError: No module named pycuda

所以看起来pycuda得到的include dirs与运行时python不同，这不应该发生（据我所知）

有什么想法吗？（很抱歉问了这么长的问题）

Talonmies提出了一个关于未找到nvcc的观点；除非python从我想不起来的地方得到它的envars，否则没有理由不这样做：

[bolster@dellgpu src]$ which nvcc
~/cuda/bin/nvcc