# N512 run - Out of Memory

**URL:** https://cms-helpdesk.ncas.ac.uk/t/n512-run-out-of-memory/174
**Category:** Unified Model
**Tags:** ARCHER2
**Created:** [9 August 2021 12:11 UTC](https://cms-helpdesk.ncas.ac.uk/t/n512-run-out-of-memory/174 "2021-08-09T12:11:12Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![dgaleareading](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/dgaleareading/32/30_2.png) [@dgaleareading](https://cms-helpdesk.ncas.ac.uk/u/dgaleareading)
#### Post date: [9 August 2021 12:11 UTC](https://cms-helpdesk.ncas.ac.uk/t/n512-run-out-of-memory/174/1 "2021-08-09T12:11:12Z")

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Hi,

I have made a copy of the standard job u-ca369 (u-cg647), and am trying to run it at a resolution of N512. I have confirmed it runs at N96 resolution. At the higher resolution, I am using an 26 nodes with atmospheric decomposition of 32x32x2 with 80 processes per node, as suggested by Grenville via [http://cms.ncas.ac.uk/wiki/Archer2#Performance](http://cms.ncas.ac.uk/wiki/Archer2#Performance). However, the atmos\_main task failed due to being out of memory. Would you be able to help?

Regards,  
Daniel

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### Author: ![pmcguire](https://avatars.discourse-cdn.com/v4/letter/p/b782af/32.png) [@pmcguire](https://cms-helpdesk.ncas.ac.uk/u/pmcguire)
#### Post date: [9 August 2021 20:12 UTC](https://cms-helpdesk.ncas.ac.uk/t/n512-run-out-of-memory/174/2 "2021-08-09T20:12:03Z")

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Hi Daniel  
Maybe someone else on the CMS Helpdesk knows more about this, but I might have had the same problem (or a similar problem) that you are having. But maybe things have changed since then.

Try looking at this ticket on the old CMS Helpdesk:  
[http://cms.ncas.ac.uk/ticket/3495](http://cms.ncas.ac.uk/ticket/3495)

Patrick

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### Author: ![dgaleareading](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/dgaleareading/32/30_2.png) [@dgaleareading](https://cms-helpdesk.ncas.ac.uk/u/dgaleareading)
#### Post date: [10 August 2021 09:30 UTC](https://cms-helpdesk.ncas.ac.uk/t/n512-run-out-of-memory/174/3 "2021-08-10T09:30:39Z")

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Hi Patrick,

thanks for the suggestion. I’ve depopulated the nodes to 50 ppn and doubled my OMP threads from 2 to 4. I’ll put any further updates here.

Daniel

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### Author: ![dgaleareading](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/dgaleareading/32/30_2.png) [@dgaleareading](https://cms-helpdesk.ncas.ac.uk/u/dgaleareading)
#### Post date: [11 August 2021 09:59 UTC](https://cms-helpdesk.ncas.ac.uk/t/n512-run-out-of-memory/174/4 "2021-08-11T09:59:16Z")

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This seems to have worked. Thanks Patrick.

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### 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: [13 August 2021 09:59 UTC](https://cms-helpdesk.ncas.ac.uk/t/n512-run-out-of-memory/174/5 "2021-08-13T09:59:52Z")

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