Pseudocolor plot of mixed-material variable stored in Blueprint is SLOW.

[BradWhitlock]

Describe the bug

Plotting a mixed-material variable stored in Blueprint is slow. I made a mesh with 1M quads, 3 materials, and a mixed-material variable. When I made a plot of the variable, it took a long time for the engine to execute the plot.

I killed the engine and got a stack and it looks like the to_silo() method in Conduit (which turns the mixed-material field to Silo format) is likely what is taking the time. I skimmed that code the other day and it appeared to do a lot of Node data conversion, which is known to be slow.

4       0x1555238b4618 avtBlueprintFileFormat::GetVar(int, char const*) + 3000
3       0x15554ac5518a conduit::blueprint::mesh::matset::detail::to_silo(conduit::Node const&, conduit::Node const&, conduit::Node&, double) + 1530
2       0x15554b01b26c conduit::Node::Node(conduit::Node const&) + 44
1       0x15554b018759 conduit::Node::compact_to(conduit::Node&) const + 73

To Reproduce

1. Open blueprint_final.root
2. Add a Pseudocolor plot of mesh_main/mass
3. Draw

Expected behavior

The plot should be generated a lot faster (no more than a few seconds). It's taking minutes.

Attachments

The data file was given on RZ to @cyrush , @JustinPrivitera in case that is helpful.

Desktop

• rzwhippet

[cyrush]

@BradWhitlock thanks for the example, we will take a look

[JustinPrivitera]

to_silo in Conduit could probably use lots of love.