Python Script TOP node will only cook on a single HQ client

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Hi all, I have a HQueue farm with 15 clients, server can detect them all and running render ROPs though PDG will use all the clients. But when I try and run a Python Script node in "out of process" mode it only uses a single client. I have the HQueue scheduler set to only use a single CPU, so I'd expect every CPU on every client to be given a workItem. When I try to process 1000+ Python workItems it seems to send them in batches of 30 and only to a single client. We think the batch of 30 thing is only happening when running the job in the TOPs UI, not when submitting the job from the HQueue server.

Anyone know about this behaviour?

Thanks!
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Check what python executable is set. If it's hython you may be limited by houdini licenses.
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