# TBB issue with volume rendering
**URL:** https://discourse.paraview.org/t/tbb-issue-with-volume-rendering/4369
**Category:** ParaView Support
**Created:** [May 19, 2020, 7:33pm UTC](https://discourse.paraview.org/t/tbb-issue-with-volume-rendering/4369 "2020-05-19T19:33:03Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Andy\_Bauer](https://discourse.paraview.org/u/Andy_Bauer)
#### Post date: [May 19, 2020, 7:33pm UTC](https://discourse.paraview.org/t/tbb-issue-with-volume-rendering/4369/1 "2020-05-19T19:33:03Z")
Hi,
I’m working with a user who’s getting the following trying to do volume rendering using OSPRay in parallel on a Cray:
```auto
TBB Warning: The number of workers is currently limited to 0. The request for 43 workers is ignored. Further requests for more workers will be silently ignored until the limit changes.
```
This is causing the batch job to lock up and no screen shot is output. There are 44 cores but we’re only running with a single MPI job to try and reduce the possible problems. Any ideas on how what could cause this problem or how to get around this? This is with ParaView 5.8.
Thanks,
Andy
---
### Author:  [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)
#### Post date: [May 19, 2020, 11:56pm UTC](https://discourse.paraview.org/t/tbb-issue-with-volume-rendering/4369/2 "2020-05-19T23:56:08Z")
@chuckatkins, any ideas?