# \#openifs-long-runs **URL:** https://forum.ecmwf.int/tag/openifs-long-runs/126.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [OIFS does not iterate date in output file, only time](https://forum.ecmwf.int/t/oifs-does-not-iterate-date-in-output-file-only-time/14470)
**Author:** [@Jordan\_Seneca](https://forum.ecmwf.int/u/Jordan_Seneca)\ **Replies:** 4\ **Last updated:** [19 January 2026 14:43 UTC](https://forum.ecmwf.int/t/oifs-does-not-iterate-date-in-output-file-only-time/14470 "2026-01-19T14:43:37Z")
OIFS outputs fields iterate forward in time only, but not in date. For example, in ICMSH\\_t I get (with grib\_ls): 2 ecmf hybrid 60 20240201 18 fc t … --- ## [Glue restart files to change number of processors for restart](https://forum.ecmwf.int/t/glue-restart-files-to-change-number-of-processors-for-restart/12154)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 26\ **Last updated:** [7 October 2022 13:29 UTC](https://forum.ecmwf.int/t/glue-restart-files-to-change-number-of-processors-for-restart/12154 "2022-10-07T13:29:19Z")
Good evening I'm wondering if there is a tool or guide on how to "glue" and "split" the restart files (srf) so that the restart can be run on a different number of processors than the previous leg. For example, I've go… --- ## [OpenIFS crashes after 170 years with super-warm tropical ocean, heavy rain, and tropical sea-ice cover!](https://forum.ecmwf.int/t/openifs-crashes-after-170-years-with-super-warm-tropical-ocean-heavy-rain-and-tropical-sea-ice-cover/12143)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 10\ **Last updated:** [7 October 2022 13:17 UTC](https://forum.ecmwf.int/t/openifs-crashes-after-170-years-with-super-warm-tropical-ocean-heavy-rain-and-tropical-sea-ice-cover/12143 "2022-10-07T13:17:06Z")
Good afternoon all, As you may see in the title of the post, I've encountered a really strange crash in OpenIFS. The configuration is T159L91 + ORCA05 (coupled OpenIFS cy40 + NEMO 3.6 via OASIS3-MCT3, WAM turned off). … --- ## [Manually editing dates in rcf & waminfo](https://forum.ecmwf.int/t/manually-editing-dates-in-rcf-waminfo/12117)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 3\ **Last updated:** [17 June 2021 13:57 UTC](https://forum.ecmwf.int/t/manually-editing-dates-in-rcf-waminfo/12117 "2021-06-17T13:57:58Z")
Over climatological runtimes OIFS 43r1v1 has stack memory and runtime growth problems. Shown is a 120 year long EC-Earth 4 simulation. The issue was reproduced with standalone OIFS. A solution targeting the root p… --- ## [Restart file generation can suffer occasional bit level changes affecting reproducibility](https://forum.ecmwf.int/t/restart-file-generation-can-suffer-occasional-bit-level-changes-affecting-reproducibility/12156)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 2\ **Last updated:** [17 November 2020 13:33 UTC](https://forum.ecmwf.int/t/restart-file-generation-can-suffer-occasional-bit-level-changes-affecting-reproducibility/12156 "2020-11-17T13:33:43Z")
It's been reported within the EC-Earth consortium with their version of IFS, and confirmed with OpenIFS 40r1, that occasional random bit-flips can occur when the model writes restart files. This means that two identical … --- ## [Can not run OpenIFS beyond year 2154 (255 years since 1900)](https://forum.ecmwf.int/t/can-not-run-openifs-beyond-year-2154-255-years-since-1900/12134)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 1\ **Last updated:** [23 July 2019 11:56 UTC](https://forum.ecmwf.int/t/can-not-run-openifs-beyond-year-2154-255-years-since-1900/12134 "2019-07-23T11:56:39Z")
Hi all I've just had a crash of my coupled OpenIFS cy40r1 +NEMO 3.6 model, the error being \[481\] grib\_accessor\_class\_budgdate.c at line 188: assertion failure Assert(year \< 255) I know Jan Streffing talked about this… --- ## [OpenIFS Cy40R1 crash in GRIB\_API in a very long run](https://forum.ecmwf.int/t/openifs-cy40r1-crash-in-grib-api-in-a-very-long-run/12155)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 13\ **Last updated:** [16 April 2019 14:56 UTC](https://forum.ecmwf.int/t/openifs-cy40r1-crash-in-grib-api-in-a-very-long-run/12155 "2019-04-16T14:56:16Z")
Hi all I'm trying to run a pre-industrial control run with a coupled model, OpenIFS\_CY40R1 + NEMO\_3.6 + OASIS3\_MCT2.8. OpenIFS runs at T159 L91 resolution with a 1 hr time step. In IFS time, the model starts at 1950… --- ## [Model complexity / number of files for restart](https://forum.ecmwf.int/t/model-complexity-number-of-files-for-restart/12138)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 3\ **Last updated:** [3 April 2019 13:12 UTC](https://forum.ecmwf.int/t/model-complexity-number-of-files-for-restart/12138 "2019-04-03T13:12:15Z")
Hello, I would like to know how many fields are needed to restart OpenIFS / what's the number of prognostic variables? Since the restart fields are stored in binary files it's not easy to inspect. I tried to calculate i… --- ## [Output bottleneck in OpenIFS](https://forum.ecmwf.int/t/output-bottleneck-in-openifs/12115)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 2\ **Last updated:** [20 March 2019 22:57 UTC](https://forum.ecmwf.int/t/output-bottleneck-in-openifs/12115 "2019-03-20T22:57:22Z")
Hi all I'm running a coupled model using OpenIFS cy40r1v2 (with some slight modifications) T159 L91 + NEMO ORCA05 L46 + OASIS3-MCT3, and I'm trying to optimise for performance. What I've found is that OpenIFS output i… --- ## [Restart confusion](https://forum.ecmwf.int/t/restart-confusion/12112)
**Author:** [@UnknownUser](https://forum.ecmwf.int/u/UnknownUser)\ **Replies:** 3\ **Last updated:** [14 January 2019 21:08 UTC](https://forum.ecmwf.int/t/restart-confusion/12112 "2019-01-14T21:08:04Z")
Hi all, I have difficulties understanding the logic in exactly when OpenIFS writes output files and restart files. This is in the context of the superparameterization project, where we run OpenIFS coupled to another … --- ## [Name pattern for output files, ICMGG and ICMSH](https://forum.ecmwf.int/t/name-pattern-for-output-files-icmgg-and-icmsh/12140)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 3\ **Last updated:** [24 August 2018 19:17 UTC](https://forum.ecmwf.int/t/name-pattern-for-output-files-icmgg-and-icmsh/12140 "2018-08-24T19:17:08Z")
Hi all I'm planning to run a very long simulation with OpenIFS in a coupled mode. However, if my math is correct, with a 1 hour time step, after 114 years OpenIFS will have run for \> 999999 time step and then 6 digits t… --- ## [Restart simulations](https://forum.ecmwf.int/t/restart-simulations/12120)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 5\ **Last updated:** [15 November 2016 11:34 UTC](https://forum.ecmwf.int/t/restart-simulations/12120 "2016-11-15T11:34:35Z")
I have run a long forecast and want to re-start it. I have the srf files and the rcf file. When I try to restart the forecast (without making any changes to fort.4 or rcf) nothing seems to happen - i.e. no more timesteps…