[2023.1.1] Simulation App Extremely Slow to Start

[fayezsalka]

Hi,

On my windows machine, starting a simulation app takes incredibly long, almost 2 minutes, even though cache is updated to latest version, and all services are green. Starting Isaac Sim outside python is fast. The code is just a simple python example that adds a cube to world (without getting asset root path), then closes the simulation.

[4.308s] [ext: omni.isaac.sim.python-2023.1.1] startup
[4.309s] Simulation App Starting
2024-03-23 13:08:59 [4,267ms] [Warning] [omni.kit.widget.settings.settings_model] a value for setting /rtx/ecoMode/enabled has been requested but is not available
2024-03-23 13:08:59 [4,267ms] [Warning] [omni.kit.widget.settings.settings_model] a value for setting /rtx/directLighting/enabled has been requested but is not available
2024-03-23 13:08:59 [4,267ms] [Warning] [omni.kit.widget.settings.settings_model] a value for setting /rtx/reflections/enabled has been requested but is not available
2024-03-23 13:08:59 [4,268ms] [Warning] [omni.kit.widget.settings.settings_model] a value for setting /rtx/translucency/enabled has been requested but is not available
2024-03-23 13:08:59 [4,268ms] [Warning] [omni.kit.widget.settings.settings_model] a value for setting /rtx/raytracing/subsurface/enabled has been requested but is not available
2024-03-23 13:08:59 [4,268ms] [Warning] [omni.kit.widget.settings.settings_model] a value for setting /rtx/caustics/enabled has been requested but is not available
2024-03-23 13:09:01 [5,978ms] [Warning] [omni.kit.hotkeys.core.registry] [Hotkey] duplicated action as SPACE (On Press) with omni.kit.widget.toolbar.omni.kit.widget.toolbar::toolbar::play!
2024-03-23 13:09:01 [5,979ms] [Warning] [omni.kit.hotkeys.core.registry] [Hotkey] Cannot register Global [omni.kit.widget.toolbar] omni.kit.widget.toolbar::toolbar::play.SPACE, error code: Duplicated action definition
[119.858s] app ready
2024-03-23 13:10:55 [120,161ms] [Warning] [omni.kit.hotkeys.core.registry] [Hotkey] duplicated action as SPACE (On Press) with omni.kit.widget.toolbar.omni.kit.widget.toolbar::toolbar::play!
2024-03-23 13:10:55 [120,161ms] [Warning] [omni.kit.hotkeys.core.registry] [Hotkey] Cannot register Global [omni.kit.widget.toolbar] omni.kit.widget.toolbar::toolbar::play.SPACE, error code: Duplicated action definition
[120.491s] RTX ready
[120.662s] Simulation App Startup Complete
2024-03-23 13:11:01 [126,003ms] [Warning] [omni.usd] Unexpected reference count of 2 for UsdStage ‘anon:0000013C13E063C0:World0.usd’ while being closed in UsdContext (this may indicate it is still resident in memory).
[126.135s] Simulation App Shutting Down

[fayezsalka]

To clarify, the Nucleaus server is running and updated to latest version, attempting the other solutions suggested around did not solve the issue here

[fayezsalka]

upon closer inspection on the full log, it seems that Isaac simulation is compiling RTX shader on each start, even though if I launch Isaac outside python, it doesn’t recompile the shaders at each start. Cache is updated and running to latest version, Nucleus server is running.

2024-03-23 13:32:23 [36,113ms] [Info] [gpu.foundation.plugin] Waiting for compilation of ray tracing shaders for RTX renderer main raytracing pipeline by GPU driver: 30 seconds so far

2024-03-23 13:32:53 [66,113ms] [Info] [gpu.foundation.plugin] Waiting for compilation of ray tracing shaders for RTX renderer main raytracing pipeline by GPU driver: 60 seconds so far

2024-03-23 13:33:23 [96,114ms] [Info] [gpu.foundation.plugin] Waiting for compilation of ray tracing shaders for RTX renderer main raytracing pipeline by GPU driver: 90 seconds so far

2024-03-23 13:33:46 [119,273ms] [Info] [gpu.foundation.plugin] Ray tracing shader compilation for RTX renderer main raytracing pipeline finished after 113 seconds

[fayezsalka]

http://localhost:34080/omniverse://localhost/

Url is accessible from my machine:

same for http://localhost:34080/omniverse://localhost/NVIDIA/Assets/Isaac/2023.1.1

no issues there

[fayezsalka]

The only fix is to downgrade to 2022.2.1, when downgrading to that version, I can see the Nucleus server cache being filled.

Any suggestion how to fix this? It’s disappointing :(

[fayezsalka]

Full log:

kit_20240323_165937.log (795.7 KB)

[Simplychenable]

@fayezsalka would this thread be of any relevance?

Isaac 2023.1.1 standalone starting up time problem

Hi, Setup: I’m following the standalone tutorial in the official isaac sim documents ‘5.7. Adding a New Manipulator’. This is being run on Window 11 with 4090 and 24core intel cpu Problem Why does it take so long startup? There’s a 120second gap between Simulation App Starting and Simulation App Startup Complete. And “world.add_task() world.reset()” took 120second How can i fix it? [image] [image]

[fayezsalka]

Yep thanks! One of the comments suggested changing backend to Vulkan, and that seems to fix the issue.