try:
    import h5writer
except ImportError:
    print 100*"*"
    print "ERROR: For using the utils.cxiwriter.CXIWriter class please install the package \'h5writer\'."
    print "\t $ pip install h5writer"
    print "\t (Github repository: https://github.com/mhantke/h5writer)"
    print 100*"*"
    exit(1)
    
import ipc.mpi

logger = h5writer.logger

if ipc.mpi.size == 1:
    CXIWriter = h5writer.H5Writer
else:
    class CXIWriter(h5writer.H5WriterMPI):
        def __init__(self, filename, chunksize=100, compression=None):
            h5writer.H5WriterMPI.__init__(self, filename=filename, chunksize=chunksize, compression=compression, comm=ipc.mpi.slaves_comm)

try:
    import h5writer
except ImportError:
    print 100*"*"
    print "ERROR: For using the utils.cxiwriter.CXIWriter class please install the package \'h5writer\'."
    print "\t $ pip install h5writer"
    print "\t (Github repository: https://github.com/mhantke/h5writer)"
    print 100*"*"
    exit(1)
    
import ipc.mpi

logger = h5writer.logger

if ipc.mpi.size == 1:
    CXIWriter = h5writer.H5Writer
else:
    class CXIWriter(h5writer.H5WriterMPI):
        def __init__(self, filename, chunksize=100, compression=None):
            h5writer.H5WriterMPI.__init__(self, filename=filename, chunksize=chunksize, compression=compression, comm=ipc.mpi.slaves_comm.Clone())

Use a separate communicator for each cxi writer
Use a separate communicator for each cxi writer
