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Rendering with Arnold in Houdini and Solaris using the HtoA plug-in.
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Solaris: Massive slowdown in HdEngine:Execute

Message 1 of 5
288 Views, 4 Replies

Solaris: Massive slowdown in HdEngine:Execute

Hi, We are evaluating more recent versions of HtoA for use at our Studio and have run into an alarming slowdown (orders of magnitude) in time to first pixel of IPR and husk rendering. 

our current production version of arnold is HtoA, and we are testing the latest HtoA


To eliminate any potential issues with our data, we've tested USDAlab 2.0.1 and can replicate the issue:

  •  The time to first pixel goes from ~6 seconds in HtoA to ~480 seconds in HtoA
  • tested separately on both linux and windows, and this happens both in husk rendering as well as viewport IPR.
  • We could get away with using sick instead of husk, but for viewport rendering this is hugely problematic.

At a glance it seems something is up with wait time during material translation.

Attached are chrome://tracing files for the two versions, as well as some screengrabs shown below:





Labels (4)
Message 2 of 5

That looks just like something Arnold support already logged with the HtoA development team (ticket reference: HTOA-2413)


Why does a studio uses a peer-to-peer forum instead of support for something like this?



// Stephen Blair
// Arnold Renderer Support
Message 3 of 5

Thanks for the ticket reference, Stephen. It's sometimes hard to know which of the 5 different support services to use (forums, mailing list, support email, slack, github), but in our last call with one of Autodesk's Tech Specialists they recommended we use these forums. I suppose that was bad advice; we'll use support in future and be in touch on access to view internal tickets.

Message 4 of 5

The just-released HtoA has a fix for this problem.

Help | HtoA | Autodesk



Arnold Renderer Support

// Stephen Blair
// Arnold Renderer Support
Message 5 of 5

Thanks all involved.

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