# Perturbed start dump not changing run outputs

**URL:** https://cms-helpdesk.ncas.ac.uk/t/perturbed-start-dump-not-changing-run-outputs/2166
**Category:** Unified Model
**Created:** [4 September 2026 07:52 UTC](https://cms-helpdesk.ncas.ac.uk/t/perturbed-start-dump-not-changing-run-outputs/2166 "2026-09-04T07:52:17Z")
**Posts on this page:** 1
**Showing post:** 6

<div class="post-metadata">

### Author: ![isangha](https://avatars.discourse-cdn.com/v4/letter/i/82dd89/32.png) [@isangha](https://cms-helpdesk.ncas.ac.uk/u/isangha)
#### Post date: [4 September 2026 12:20 UTC](https://cms-helpdesk.ncas.ac.uk/t/perturbed-start-dump-not-changing-run-outputs/2166/6 "2026-09-04T12:20:36Z")

</div>

Hi Jonny,

I do:

module load scitools

export PYTHONPATH=/projects/metoff/umdir/mule/mule-2025.10.1/python3.12.12\_numpy-2.3.5/no-openmp/lib

module load um\_tools

---

_[View the full topic](https://cms-helpdesk.ncas.ac.uk/t/perturbed-start-dump-not-changing-run-outputs/2166)._