python - Cannot write to shared MPI file with mpi4py -


i tried make file handler uses shared file mpi4py logging module. can't make write.

program:

from mpi4py import mpi import io  class mpilogfile(object):     def __init__(self, comm, filename, mode):         self.file_handle = mpi.file.open(comm, filename, mode)         self.file_handle.set_atomicity(true)         self.buffer = io.stringio()      def write(self, msg):         print("msg type:", type(msg))         self.buffer.write(msg)         self.file_handle.write_shared(self.buffer)      def close(self):         self.file_handle.sync()         self.file_handle.close()  comm = mpi.comm_world logfile = mpilogfile(     comm, "test.log",      mpi.mode_wronly | mpi.mode_create | mpi.mode_append ) logfile.write("hello")

error:

traceback (most recent call last):   file "test_mpi.py", line 21, in <module>     logfile.write("hello")   file "test_mpi.py", line 13, in write     self.file_handle.write_shared(self.buffer)   file "mpi/file.pyx", line 438, in mpi4py.mpi.file.write_shared (src/mpi4py.mpi.c:138222)   file "mpi/msgbuffer.pxi", line 1044, in mpi4py.mpi.message_io_write (src/mpi4py.mpi.c:39788)   file "mpi/msgbuffer.pxi", line 1030, in mpi4py.mpi._p_msg_io.for_write (src/mpi4py.mpi.c:39639)   file "mpi/msgbuffer.pxi", line 143, in mpi4py.mpi.message_simple (src/mpi4py.mpi.c:30601) typeerror: message: expecting buffer or list/tuple

found fix:

python: convert string byte array

https://github.com/mpi4py/mpi4py/blob/master/test/test_io.py

from mpi4py import mpi  import array  class mpilogfile(object):     def __init__(self, comm, filename, mode):         self.file_handle = mpi.file.open(comm, filename, mode)         self.file_handle.set_atomicity(true)         self.buffer = bytearray      def write(self, msg):         b = bytearray()         b.extend(map(ord, msg))         self.file_handle.write_shared(b)      def close(self):         self.file_handle.sync()         self.file_handle.close()  comm = mpi.comm_world logfile = mpilogfile(     comm, "test.log",      mpi.mode_wronly | mpi.mode_create | mpi.mode_append ) logfile.write("hello")

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