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Created by Ethan Stam@ethan.stamDeveloper

Ghost Cell Generator Slows Down Significantly as Number of Nodes in Client Server connection increases

@utkarsh.ayachit @cory.quammen

@patchett2002

Local Client is nightly windows zip from here

Server is a spack build of paraview@master using intel and openmpi. Build type is RelWithDebInfo

The workflow is:

  1. Load vtm of Unstructured Grid with ~25 million cells
  2. Merge Blocks (default)
  3. Ghost Cell Generator (Minimum of 2 ghost levels)

I am comparing with 5.9.1 5.9.1's Ghost Cell Generator is getting faster while the number of nodes increases while master is getting significantly slower. I am using the timer log to keep track of the time spent applying the filter.

1 Node, 36 MPI ranks:

  • 5.9.1: PropertiesPanel::Apply, 6.594 seconds
  • master: PropertiesPanel::Apply, 5.919 seconds

2 Nodes, 72 MPI ranks:

  • 5.9.1: PropertiesPanel::Apply, 5.138 seconds
  • master: PropertiesPanel::Apply, 80.846 seconds

4 Nodes, 144 MPI ranks:

  • 5.9.1: PropertiesPanel::Apply, 3.072 seconds
  • master: PropertiesPanel::Apply, 231.568 seconds
Edited by Ethan Stam
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