# Porting ENS to ARCHER2 **URL:** \ **Category:** Unified Model\ **Tags:** ARCHER2\ **Created:** [24 August 2025 09:31 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786 "2025-08-24T09:31:52Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![FranMorris](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/franmorris/32/285_2.png) [@FranMorris](https://cms-helpdesk.ncas.ac.uk/u/FranMorris)\ **Post date:** [24 August 2025 09:31 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786/1 "2025-08-24T09:31:52Z")
Hi! Currently trying to port an ensemble nesting suite at UM vn13.0 to ARCHER2 thanks to help from the RMED team at the MO. Since I’m not on Monsoon I have to rerun the MOGREPS-G members to drive the internal LAM, but I’m having trouble with the ENGL\_UM\_FCST site. It doesn’t seem to be accepting running in parallel and I’m not sure what settings to change. It gives the following error: ```auto ereport_mod:???!!!???!!!??!!!???!!! ERROR ???!!!???!!!???!!!??!!! ereport_mod:? Error code: 100 ereport_mod:? Error from routine: UM_SHELL ereport_mod:? Error message: UM started on 1 PEs but 720 asked for. Please adjust decomposition ereport_mod:? Error from processor: 0 ereport_mod:? Error number: 0 ``` It does run when I set `dm_nproc=1,1`. Maybe this is fine, but it seems a bit inefficient? The suite I’m working on is `u-do972`. Thanks in advance for any advice! Best, Fran edit: sent message too early and also for some reason tagged monsoon; I’m very much not using monsoon haha further context edit: I know that the engl app seems to be using the bin/um\_forecast\_wrapper file to call the um-atmos command instead of doing it directly, but even when I do swap it out and call um-atmos directly, it still won’t run in parallel ---
**Author:** ![grenville](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/grenville/32/29_2.png) [@grenville](https://cms-helpdesk.ncas.ac.uk/u/grenville)\ **Post date:** [26 August 2025 11:17 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786/2 "2025-08-26T11:17:01Z")
Hi Fran I have a copy of u-do972, but can’t get it to validate `Jinja2Error: No module named ‘pytz’` - how do you get pytz? Grenville ---
**Author:** ![FranMorris](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/franmorris/32/285_2.png) [@FranMorris](https://cms-helpdesk.ncas.ac.uk/u/FranMorris)\ **Post date:** [26 August 2025 15:21 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786/3 "2025-08-26T15:21:15Z")
Hi Grenville Thanks for getting back to me. Not sure what exactly is going on with pytz but it seems to be installed under cray-python or postproc modules. Having a quick look it seems like the ensemble nesting suite uses it to check which model version is appropriate for the start date - important since analysis only exists for certain versions for certain dates (e.g. I’m using PS43 since I’m running a suite starting in October 2021, and PS43 is valid from 4/12/2019 to 4/5/2022 or something like that). I don’t know why but it doesn’t complain for me when I start the suite or run cylc validate. Best, Fran ---
**Author:** ![grenville](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/grenville/32/29_2.png) [@grenville](https://cms-helpdesk.ncas.ac.uk/u/grenville)\ **Post date:** [26 August 2025 15:52 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786/4 "2025-08-26T15:52:49Z")
ugh - ignore me, got cylc7 and cylc8 in a muddle ---
**Author:** ![grenville](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/grenville/32/29_2.png) [@grenville](https://cms-helpdesk.ncas.ac.uk/u/grenville)\ **Post date:** [27 August 2025 08:38 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786/5 "2025-08-27T08:38:27Z")
Hi Fran Please take a look at the `[[ENGL_UM_FCST]]` section in `/home/n02/n02/grenvill/roses/u-do972/site/archer2/suite-adds.rc` it has correct settings for running on ARCHER. I see other places in the suite where the `ROSE_LAUNCHER_PREOPTS` are incorrectly set for ARCHER. The `engl_em_fcst` tasks run OK with the above. Grenville ---
**Author:** ![FranMorris](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/franmorris/32/285_2.png) [@FranMorris](https://cms-helpdesk.ncas.ac.uk/u/FranMorris)\ **Post date:** [27 August 2025 09:59 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786/6 "2025-08-27T09:59:30Z")
Thanks so much Grenville - that has worked now!! Much appreciated!! Best, Fran ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/cms_support/original/1X/1fd2411499ffcbc299fe756cd5cdf26e44956558.png) [@system](https://cms-helpdesk.ncas.ac.uk/u/system)\ **Post date:** [28 August 2025 10:00 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ens-to-archer2/1786/7 "2025-08-28T10:00:10Z")
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