# vtkDistributedDataFilter hangs when used with SetMinimumGhostLevel to 1

**URL:** https://discourse.vtk.org/t/vtkdistributeddatafilter-hangs-when-used-with-setminimumghostlevel-to-1/4364
**Category:** Support
**Created:** [October 6, 2020, 4:08pm UTC](https://discourse.vtk.org/t/vtkdistributeddatafilter-hangs-when-used-with-setminimumghostlevel-to-1/4364 "2020-10-06T16:08:51Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![myousefi2016](https://discourse.vtk.org/user_avatar/discourse.vtk.org/myousefi2016/32/921_2.png) [@myousefi2016](https://discourse.vtk.org/u/myousefi2016)
#### Post date: [October 6, 2020, 4:08pm UTC](https://discourse.vtk.org/t/vtkdistributeddatafilter-hangs-when-used-with-setminimumghostlevel-to-1/4364/1 "2020-10-06T16:08:51Z")

</div>

I’m trying to distribute my vtkUnstructuredGrid objects that are in the order of 1 GB ~ 10 GB by using `vtkDistributedDataFilter`. It’s interesting that I don’t have any problem with small files by using the same pipeline that are in the order of 20 MB ~ 100 MB but for my larger files when I set `SetMinimumGhostLevel` the filter never finishes it’s job. I’m using it based on this defined function:

```auto
import vtk
from mpi4py import MPI

def vtkUnstructuredGridReader(file_name):
    reader = vtk.vtkXMLUnstructuredGridReader()
    reader.SetFileName(file_name)
    reader.Update()

    ug = reader.GetOutput()

    return ug

def CreateControllerAndCommunicator(comm):
    acomm = vtk.vtkMPI4PyCommunicator.ConvertToVTK(comm)
    contr = vtk.vtkMPIController()
    contr.SetCommunicator(acomm)

    return [contr, acomm]

def DistributeData(ug, contr):
    distFilter = vtk.vtkDistributedDataFilter()
    distFilter.SetInputData(ug)
    distFilter.SetController(contr)
    distFilter.UseMinimalMemoryOff()
    distFilter.SetMinimumGhostLevel(1)
    distFilter.Update()

    return [distFilter.GetOutput(), distFilter.GetCuts()]

comm = MPI.COMM_WORLD

contr, acomm = CreateControllerAndCommunicator(comm)

rank = acomm.GetLocalProcessId()

ug = vtk.vtkUnstructuredGrid()

if rank == 0:
    ug = vtkUnstructuredGridReader('results_snapshot_1567146.vtu')

distributedUG, distributionCuts = DistributeData(ug, contr)

```

I’m using OpenMPI 4.0.3 and I built my VTK with parallel functionality enabled from master branch of current repository. Any idea what’s going on here?