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What's a model restart?

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A restart allows the model to continue a forecast with a succession of  individual runs, each one starting where the other one left off. e.g. running an extended forecast of 100 days with 5 separate runs of 20 days each.

A restart will always be exact, that is, the results of the restarted forecast should always match a single run of the model for the same total length (assuming all settings remain the same).

This page describes how to configure and use the model restart facility. 


Warning

The restarted run must always have the same parallel decomposition (TASKS x THREADS) otherwise the restart will fail.



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How to configure restarts

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The file name includes a date as : srfddddhhmm, where dddd is the day number of the run, hh is the hour and mm is the minutes. e.g. srf00000120.0002 would be for day 1 and 20mins into the run written from MPI task 2.

Wave model restart files

If the wave model is active, it writes its own restart files (the wave model acts as a sub-model inside OpenIFS).  The wave model is active if the logical variable LWCOU is set .true. in the model namelist fort.4.

The wave model restart files begin with the names 'LAW' and 'BLS', each followed by a date substring. A small text file 'waminfo' is also created.

Deletion of old restart files

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reresf.F90 - calls the I/O subsystem to read the restart files. Counterpart to wrresf.F90. Any changes to wrresf must be mirrored by changes to reresf.F90.

 

 

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