Porting ENS to ARCHER2

Unified Model
1

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:

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

2

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

3

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

4

ugh - ignore me, got cylc7 and cylc8 in a muddle

5

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

6

Thanks so much Grenville - that has worked now!! Much appreciated!!

Best,

Fran

7

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