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Custom Query – NEMO

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Ticket Resolution Summary Owner Reporter
#1670 worksforme trunk rev6267 runs ok on ORCA025-LIM3 nemo mcastril
Description

Test run succesful, performed on trunk (6267 revision), using the HPC-NEMO group ORCA025-LIM3 benchmark. 3000 time steps.

#1881 worksforme Met_Office-1 Use XIOS to read single file restart file andmirek andmirek
Description

Context

This development is to add functionality to read single file restart with XIOS

Analysis

Currently for a single file restart all processors open the file and read corresponding data. This method becomes inefficient when large number of processors is used to run NEMO. Recent XIOS version (ver. 2) has the capability to read data. This capability may be used to read restart if needed. This would be an addition to the existing reading functionality, activated through the variable in the namelist. https://forge.ipsl.jussieu.fr/nemo/wiki/2017WP/Met_Office-1_Mirek_XIOSread

Fix

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#1882 worksforme Write restart file using XIOS andmirek andmirek
Description

Context

XIOS offers a parallel interface to write the data. This interface can be used to write restart file

Analysis

In NEMO each processor independently writes restart file. As long as model decomposition stays the same this offers an efficient way to write restart. With increasing number of processors this method may be inefficient and put stress on the file system because of the large number of small files opened at the same time. By default XIOS is used to write diagnostic from the model. The same interface may be used to write restart file. The interface would be an addition to the existing functionality, activated through the namelist.

Fix

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