# Failed to run example cases using openmp as backend

**URL:** <https://pyfr.discourse.group/t/failed-to-run-example-cases-using-openmp-as-backend/649>\
**Category:** Errors\
**Created:** [17 July 2022 13:54 UTC](https://pyfr.discourse.group/t/failed-to-run-example-cases-using-openmp-as-backend/649 "2022-07-17T13:54:24Z")\
**Posts on this page:** 1\
**Showing post:** 29

<div class="post-metadata">

**Author:** ![hwtang](https://avatars.discourse-cdn.com/v4/letter/h/a87d85/32.png) [@hwtang](https://pyfr.discourse.group/u/hwtang)\
**Post date:** [30 July 2022 09:31 UTC](https://pyfr.discourse.group/t/failed-to-run-example-cases-using-openmp-as-backend/649/29 "2022-07-30T09:31:39Z")

</div>

Find an answer [here](https://pyfr.discourse.group/t/running-on-a-single-cpu-core/113/2).

```auto
export OMP_NUM_THREADS=1

```

Thank you all for your help.

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