I was wondering if PDG services are working as expected in UE5 or if I'm doing something wrong? I just couldn't see any speed increase in UE5, though I did see a massive speed increase in Houdini.
This is a test of generating simple city blocks in PDG, using an HDA Processor (one city block per work item):
Out-of-process (7 cores) UE5: 6 min Houdini: 3:30 min
This seems to be the same issue in UE5.7 and H21 (different test level).
Out-of-process (UE5) 7 cores - 8:20 min 14 cores - 8:30 min
Services (UE5) 7 cores - 8:00 min 14 cores - 9:30 min 7 cores (TCP session) - 7:45 min
Services (Houdini) 14 cores - 30 sec
It looks like the PDG services are being used from within Unreal, I can see the hython processes and mqserver running, but there's no speed increase. I tried different settings for the Session Type and HDA Processor but to no avail. The only tiny difference was using TCP socket session type. Using "Cook Type: In-Process" on the HDA Processor resulted in no work items coming into Unreal at all. Lastly turning on the new "Enable Shared Memory Data Transfer" results in endlessly repeated "Failed to get PDG events, error code: 6" in Unreal's output log (also in Vanilla Unreal with Side-FX binaries).
Is there any way how to configure the plugin to take advantage of the PDG services? It's a bit sad to see that 120 work items can be cooked in 30 seconds in Houdini, but to do it in Unreal it takes 8 minutes. We're talking very low poly, stylized VR here (screenshot)
