我试图从Python调用一个使用openmpi的Fortran库。 我选择使用Cython作为Python和Fortran之间的层。在
我从this answer运行了一个最小的工作示例,但是在使用openmpi时遇到了一些问题。在
下面是我在这个例子中尝试包含MPI的部分。如果我从Fortran程序调用模块ffunc
,它可以工作,但是如果我试图从Python访问它,我会得到
mca_base_component_repository_open: unable to open mca_patcher_overwrite: /path/to/mca_patcher_overwrite.so: undefined symbol: mca_patcher_base_patch_t_class (ignored)
mca_base_component_repository_open: unable to open mca_shmem_mmap: /path/to/mca_shmem_mmap.so: undefined symbol: opal_show_help (ignored)
mca_base_component_repository_open: unable to open mca_shmem_posix: /path/to/mca_shmem_posix.so: undefined symbol: opal_shmem_base_framework (ignored)
mca_base_component_repository_open: unable to open mca_shmem_sysv: /path/to/mca_shmem_sysv.so: undefined symbol: opal_show_help (ignored)
作为一个最小的工作示例,我有以下内容:
要调用ffunc.p90
的Fortran模块:
Fortran-C包装器pyffunc.f90
:
C头pyffunc.h
:
extern void c_func(double* a, double* b, double* c);
Cython包装器pyffunc.pyx
:
cdef extern from 'pyffunc.h':
void c_func(double* a, double* b, double* c)
def func(double a, double b):
cdef:
double c
c_func(&a, &b, &c)
print('cython: a = {}, b = {}, c = {}'.format(a, b, c))
return c
Python setup.py
(并从mpif90 showme
获得包含和库:
from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext
from numpy import get_include
from os import system
# compile the fortran modules without linking
fortran_mod_comp = 'mpif90 ffunc.f90 -c -o ffunc.o -O3 -fPIC'
print(fortran_mod_comp)
system(fortran_mod_comp)
shared_obj_comp = 'mpif90 pyffunc.f90 -c -o pyffunc.o -O3 -fPIC'
print(shared_obj_comp)
system(shared_obj_comp)
ext_modules = [Extension(# module name:
'pyffunc',
# source file:
['pyffunc.pyx'],
# other compile args for gcc
extra_compile_args=[
'-fPIC',
'-O3',
'-I/usr/lib/x86_64-linux-gnu/openmpi/include',
'-pthread',
'-I/usr/lib/x86_64-linux-gnu/openmpi/lib',
],
# other files to link to
extra_link_args=['ffunc.o',
'pyffunc.o',
'-pthread',
'-I/usr/lib/x86_64-linux-gnu/openmpi/lib',
'-L/usr//lib',
'-L/usr/lib/x86_64-linux-gnu/openmpi/lib',
'-lmpi_usempif08',
'-lmpi_usempi_ignore_tkr',
'-lmpi_mpifh',
'-lmpi',
])]
setup(name = 'pyffunc',
cmdclass = {'build_ext': build_ext},
include_dirs = [get_include()],
ext_modules = ext_modules)
以及Python test.py
文件:
from pyffunc import func
a = 5
b = 9
c = func(5, 9)
print('python: a = {}, b = {}, c = {}'.format(a, b, c))
有谁能给我一个正确方向的提示吗?-我找了各种各样的东西,但我被困在这里了。在
正如@gillesgouaillardet所建议的,诀窍确实是用
configure disable-dlopen
选项编译openmpi。 虽然我仍然不明白问题所在,也不知道解决办法。也许有人有更详细的答案?在相关问题 更多 >
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