scalapack4py 0.1.0

Python wrapper for dynamically loaded ScaLAPACK and BLACS libraries

Dynamic ScaLAPACK wrapper for Python

Python wrapper for dynamically loaded ScaLAPACK and BLACS libraries

from scalapack4py import ScaLAPACK4py, parprint, ordprint
from ctypes import cast, py_object, CDLL, RTLD_GLOBAL

scalapack_lib = CDLL('libscalapack-openmpi.so.2.0', mode=RTLD_GLOBAL)
sl = ScaLAPACK4py(scalapack_lib)


descr = sl.wrap_blacs_desc(descr)
locshape = (descr.locrow, descr.loccol)
data = np.ctypeslib.as_array(data, shape=locshape)
sl.scatter(data_src, descr, data)

Or

# run as:  mpiexec -n 2 python3 -u test_scatter_complex.py
import numpy as np, os
from mpi4py import MPI
from scalapack4py import ScaLAPACK4py
from ctypes import CDLL, RTLD_GLOBAL, POINTER, c_int, c_double

sl = ScaLAPACK4py(CDLL('libscalapack-openmpi.so.2.0', mode=RTLD_GLOBAL))

n = 5
dtype=np.complex128
a = np.arange(n*n, dtype=dtype).reshape((n,n), order='F') * (MPI.COMM_WORLD.rank+1) if MPI.COMM_WORLD.rank==0 else None

print (a)

MP, NP = 2,1

ctx = sl.make_blacs_context(sl.get_default_system_context(), MP, NP)
descr = sl.make_blacs_desc(ctx, n, n)
print("descr", descr, descr.locrow, descr.loccol)

b = np.zeros((descr.locrow, descr.loccol), dtype=dtype)

sl.scatter_numpy(a, POINTER(c_int)(descr), b.ctypes.data_as(POINTER(c_double)), b.dtype)
print (b)


c = sl.gather_numpy(POINTER(c_int)(descr), b, (n, n))
print (c)