vtk memory test

import sys
import time
import vtk

def test_mem(filename):
    reader = vtk.vtkXMLPolyDataReader()
    reader.SetFileName(filename)
    reader.ReleaseDataFlagOn()
    reader.GetOutput().ReleaseDataFlagOn()
    reader.Update()

    polydata = reader.GetOutput()
    polydata.SetSource(None)
    del reader

    smoother = vtk.vtkWindowedSincPolyDataFilter()
    smoother.SetInput(polydata)
    smoother.SetNumberOfIterations(2)
    smoother.SetFeatureAngle(120)
    smoother.SetEdgeAngle(90.0)
    smoother.BoundarySmoothingOn()
    smoother.SetPassBand(0.1)
    smoother.ReleaseDataFlagOn()
    smoother.GetOutput().ReleaseDataFlagOn()
    smoother.Update()

    del polydata
    polydata = smoother.GetOutput()
    polydata.SetSource(None)
    del smoother

    decimation = vtk.vtkQuadricDecimation()
    decimation.SetInput(polydata)
    decimation.SetTargetReduction(0.5)
    decimation.ReleaseDataFlagOn()
    decimation.GetOutput().ReleaseDataFlagOn()
    decimation.Update()

    del polydata
    polydata = decimation.GetOutput()
    polydata.SetSource(None)
    del decimation

    normals = vtk.vtkPolyDataNormals()
    normals.SetInput(polydata)
    normals.SetFeatureAngle(80)
    normals.AutoOrientNormalsOn()
    normals.ReleaseDataFlagOn()
    normals.GetOutput().ReleaseDataFlagOn()
    normals.Update()

    del polydata
    polydata = normals.GetOutput()
    polydata.SetSource(None)
    del normals

    stripper = vtk.vtkStripper()
    stripper.SetInput(polydata)
    stripper.PassThroughCellIdsOn()
    stripper.PassThroughPointIdsOn()
    stripper.ReleaseDataFlagOn()
    stripper.GetOutput().ReleaseDataFlagOn()
    stripper.Update()

    del polydata
    polydata = stripper.GetOutput()
    polydata.SetSource(None)
    del stripper

def main():
    test_mem(sys.argv[-1])

if __name__ == '__main__':
    main()