# \#openifs-parallel-configuration

**URL:** https://forum.ecmwf.int/tag/openifs-parallel-configuration/130.md

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## [How do I run OpenIFS in parallel configuration using several nodes?](https://forum.ecmwf.int/t/how-do-i-run-openifs-in-parallel-configuration-using-several-nodes/12778)

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**Author:** [@Marcus\_Koehler](https://forum.ecmwf.int/u/Marcus_Koehler)\
**Replies:** 0\
**Last updated:** [25 April 2025 11:16 UTC](https://forum.ecmwf.int/t/how-do-i-run-openifs-in-parallel-configuration-using-several-nodes/12778 "2025-04-25T11:16:37Z")

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We have received several questions about how OpenIFS 48r1 can be used across multiple nodes on an HPC system. It may be helpful to summarise this here: First case: You want to run the model interactively, i.e. you exec…

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## [Crash when running OpenIFS CY40 with 4 threads per task](https://forum.ecmwf.int/t/crash-when-running-openifs-cy40-with-4-threads-per-task/12097)

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**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\
**Replies:** 3\
**Last updated:** [31 July 2019 13:58 UTC](https://forum.ecmwf.int/t/crash-when-running-openifs-cy40-with-4-threads-per-task/12097 "2019-07-31T13:58:27Z")

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Good afternoon I'm running some experiments with OpenIFS T511L91 which seems to scale up to ~ 1200 MPI tasks. Beyond that the model actually becomes slower when using more CPUs. So I thought I would try to use more th…

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## [MPL\_ALLREDUCE documentation](https://forum.ecmwf.int/t/mpl-allreduce-documentation/12107)

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**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\
**Replies:** 3\
**Last updated:** [3 April 2019 13:10 UTC](https://forum.ecmwf.int/t/mpl-allreduce-documentation/12107 "2019-04-03T13:10:30Z")

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Hello, I would like to to calculate a global net flux value withing OpenIFS to verify my conservative remapping. ECMWF hides MPI functionalities under MPL. There is limited MPL documentation in Part VI of the documentati…

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## [MPI decomposition in OpenIFS](https://forum.ecmwf.int/t/mpi-decomposition-in-openifs/12101)

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**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\
**Replies:** 4\
**Last updated:** [25 March 2019 16:07 UTC](https://forum.ecmwf.int/t/mpi-decomposition-in-openifs/12101 "2019-03-25T16:07:03Z")

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Hi all I've been running OpenIFS with nice, even numbers of NPROC, e.g. NPROC=200, 400, so far, but now tried to run with NPROC=199 and got this error 522 ABOR1 CALLED 522 sumpini: nprtrw (approx square value) \> nspecr…

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## [OpenIFS hangs with no output when run across multiple nodes](https://forum.ecmwf.int/t/openifs-hangs-with-no-output-when-run-across-multiple-nodes/12178)

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**Author:** [@Sam\_Hatfield](https://forum.ecmwf.int/u/Sam_Hatfield)\
**Replies:** 5\
**Last updated:** [14 December 2018 14:59 UTC](https://forum.ecmwf.int/t/openifs-hangs-with-no-output-when-run-across-multiple-nodes/12178 "2018-12-14T14:59:27Z")

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Hi, I have been building a simple 2 node "cluster" to play around with OpenIFS. Each node has 4 cores. I'm able to run OpenIFS (the T21 test) just fine on both nodes separately with 4 processes. I'm also able to invoke …