Arnold doesn't render any frames: "Executing Vex..."

[j_steinfeldt]

Hey there, 

I don't get Arnold GPU to render my particle simulation. After starting the render it calculates and "Executing Vex..." appears inside of the render progess bar (I waited for 4 hours but it the first frame doesn't get rendered): 

Here is the log file: 

00:00:00 4857MB | log started Wed May 24 21:50:08 2023
00:00:00 4857MB | Arnold 7.2.1.1 [86d9e1ad] windows x86_64 clang-15.0.7 oiio-2.4.1 osl-1.12.9 vdb-7.1.1 adlsdk-7.4.2.47 clmhub-3.1.1.43 rlm-14.2.5 optix-6.6.0 2023/04/14 08:35:39
00:00:00 4857MB | running on DESKTOP-BH6MVMN, pid=3096
00:00:00 4857MB | 1 x AMD Ryzen 9 3900X 12-Core Processor (12 cores, 24 logical) with 130993MB
00:00:00 4857MB | NVIDIA driver version 531.61 (Optix 60806)
00:00:00 4857MB | GPU 0: NVIDIA GeForce RTX 3090 @ 1740MHz (compute 8.6) with 24575MB (14346MB available) (NVLink:0)
00:00:00 4857MB | Windows 10 (version 10.0, build 19044)
00:00:00 4857MB | soft limit for open files is set at 2048
00:00:00 4857MB |
00:00:00 4857MB | [htoa.session] Camera: /obj/cam1
00:00:00 4859MB | [htoa.object.rop] Generating ROP /out/arnold1
00:00:00 4859MB | [htoa.object.camera] cannot find "subcamtag" property on "/obj/cam1", using camera name (cam1)
00:00:00 4859MB WARNING | [htoa.node.node] [soho] Parameter not found: enable_deprecated_hair_absorption (ar_enable_deprecated_hair_absorption)
00:00:00 4859MB WARNING | [htoa.node.node] [soho] Parameter not found: imager_overhead_target_percent (ar_imager_overhead_target_percent)
00:00:00 4859MB | [htoa.object.camera] Generating camera /obj/cam1
00:00:00 4859MB | [htoa.object.geometry] Generating /obj/particles

What do the warnings mean? Is there something I have to change? I didn't found a solution yet. 

I've also pre-populated the GPU cache. 

I've tried: 

- restart pc 

- copying everything in a new hip file

- turn off optix

- starting render trough houdini command line

- checking everything

Would be amazing if anybody has an idea. Thanks a lot!

[Stephen.Blair]

Can you even archive a frame to ASS?  Seems like things are stuck evaluating the Houdini scene (VEX)
I don't think those warnings are signficant.

[j_steinfeldt · Accepted solution]

Thank you very very much for your reply, Stephen! Archiving any frames to ASS didn't work as you assumed. 

While preparing a scene file I could attach I found the problem: I had a cooking intensive timeblend sop after my cached particle sim. I cached after the timeblend directly in front of the "OUT" null again and now it renders ASS and exr's smoothly. Thank you very much for your hint! 

Best wishes!