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Modify max_fields_per_file via diag_manager namelist? #747

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menzel-gfdl opened this issue May 13, 2021 · 2 comments · May be fixed by #750
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Modify max_fields_per_file via diag_manager namelist? #747

menzel-gfdl opened this issue May 13, 2021 · 2 comments · May be fixed by #750
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@thomas-robinson @menzel-gfdl
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enhancement Issue/PR for a modification that increases performance, improves syntax, or adds functionality. feature request

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@menzel-gfdl
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Is your feature request related to a problem? Please describe.
The maximum number of variables allowed in a history file is controlled by:

FMS/diag_manager/diag_data.F90

Line 124 in 9d55115

INTEGER, PARAMETER :: MAX_FIELDS_PER_FILE = 300 !< Maximum number of fields per file.

If I'm not mistaken, diagnostics are limited to 4D (lon, lat, z, time). I am working on updates to the radiation code that require an additional spectral dimension. The work-around right now is to create one variable per spectral point, but this leads a very large number of variables and sometimes exceeds the hard limit set in the code above. Unfortunately this limit is a compile-time constant, so if you want to change it you must recompile. Can this instead be a run-time parameter accessible via the diag_manager_nml namelist?

Describe the solution you'd like
Remove the parameter attribute and add this variable to the diag_manager_nml namelist.

Describe alternatives you've considered
Ideally allow 5D (and possible more) diagnostics, but I know that given the current state of the modules this is not feasible.
@menzel-gfdl menzel-gfdl added the enhancement Issue/PR for a modification that increases performance, improves syntax, or adds functionality. label May 13, 2021
@thomas-robinson thomas-robinson added this to the 2021.03 milestone May 17, 2021
@thomas-robinson thomas-robinson mentioned this issue May 20, 2021
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@rem1776 rem1776 removed this from the 2021.03 milestone Jan 19, 2022
@rem1776
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rem1776 commented Mar 3, 2022

@menzel-gfdl Do you still need this change in the diag_manager? The issue will be addressed in the rewrite but that will take some time, so we can add this in the meantime if needed.

@uramirez8707 uramirez8707 mentioned this issue Nov 2, 2023
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Fixed in #1505

The modern diag manager no longer has any limits in the number of fields per file

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Makes MAX_FIELDS_PER_FILE a namelist variable and allocates thomas-robinson/FMS
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@thomas-robinson @rem1776 @menzel-gfdl @uramirez8707