Threading CLI commands

purav70 · December 1, 2017, 4:40pm

Hi there,

I was wondering if the method slicer.cli.run() acted as a thread, thereby running the command asynchronously, versus the method slicer.cli.runSync().

I need to call on a cli run command several times, and because the dependencies of each command are independent of each other, would using slicer.cli.run parallelize their execution?

Thanks,

Purav

pieper · December 1, 2017, 4:55pm

Yes, they can be run in parallel and you can monitor progress and end events. But also note that a lot of the ITK based CLI implementations already do image-level threading so you may overload your CPU by running them in parallel. Use top / Task Manager / Activity Monitor as needed.

This test should give you an idea:

github.com

Slicer/Slicer/blob/master/Applications/SlicerApp/Testing/Python/CLIEventTest.py

import os
import unittest
from __main__ import vtk, qt, ctk, slicer
from slicer.util import VTKObservationMixin
from slicer.ScriptedLoadableModule import *
import time

#
# CLIEventTest
#

class CLIEventTest(ScriptedLoadableModule):
  def __init__(self, parent):
    parent.title = "CLIEventTest" # TODO make this more human readable by adding spaces
    parent.categories = ["Testing.TestCases"]
    parent.dependencies = ["CLI4Test"]
    parent.contributors = ["Johan Andruejol (Kitware)"]
    parent.helpText = """
    This is a self test that tests that CLI send all the event properly.
    """

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Threading CLI commands

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