paraview python script : Delete(renderView1) does not free memory

问题

I am trying to load multiple state files by running a python script with python shell. The script is the following

#### import the simple module from the paraview
from paraview.simple import *

for time in range(0,200):
        renderView1 = GetActiveViewOrCreate('RenderView')

        # destroy renderView1
        Delete(renderView1)
        del renderView1

        filename = 'filepath/filename-%s.pvsm' % time
        servermanager.LoadState(filename)
        renderView=SetActiveView(GetRenderView())
        Render()
        # get layout
        viewLayout = GetLayout()

        # save screenshot
        SaveScreenshot('filepath/filename-%s.png' % time, layout=viewLayout, magnification=3, quality=100)

I was monitoring the memory used by machine, after some time steps the memory used by the machine is whole RAM. Can anybody tell me what I am doing wrong here.

I appreciate your time and support.

Thanks Raj

回答1:

Python is garbage-collected, which means that there are no guarantees that an object is actually removed from memory when you do 'del someBigObject'. In fact, doing 'del someObject' is not only pointless, it's considered bad style.

del only removes the binding between that identifier and the object. Thus del doesn't actually result in the object being deleted from memory.

See this for full details: https://www.quora.com/Why-doesnt-Python-release-the-memory-when-I-delete-a-large-object

回答2:

As suggested by Utkarsh the following script solved my problem. For details see this answer.

--------------------------------------------------------------------------------
from paraview.simple import *

def ResetSession():
    pxm = servermanager.ProxyManager()
    pxm.UnRegisterProxies()
    del pxm
    Disconnect()
    Connect()

for i in range(0, 10):
    ResetSession()
    servermanager.LoadState("/tmp/sample.pvsm")
    renderView=SetActiveView(GetRenderView())
    Render()
--------------------------------------------------------------------------------

来源：https://stackoverflow.com/questions/31423347/paraview-python-script-deleterenderview1-does-not-free-memory

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python

paraview