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Add starting_ensemble_id namelist option #1838

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Add starting_ensemble_id namelist option #1838

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7167d7a
Add starting_ensemble_id namelist option
abrooks1085 Feb 12, 2026
68d4772
Added documentation
abrooks1085 Mar 19, 2026
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10 changes: 7 additions & 3 deletions coupler/ensemble_manager.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ module ensemble_manager_mod

integer :: ensemble_size = 1
integer :: ensemble_id = 1
integer :: starting_ensemble_id = 1
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@uramirez8707 uramirez8707 Mar 12, 2026

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Let's document this new namelist

integer :: pe, total_npes_pm=0,ocean_npes_pm=0,atmos_npes_pm=0
integer :: land_npes_pm=0,ice_npes_pm=0

Expand All @@ -75,7 +76,7 @@ subroutine ensemble_manager_init()

integer :: i, io_status, npes, ierr

namelist /ensemble_nml/ ensemble_size
namelist /ensemble_nml/ ensemble_size, starting_ensemble_id

read (input_nml_file, ensemble_nml, iostat=io_status)
ierr = check_nml_error(io_status, 'ensemble_nml')
Expand All @@ -85,6 +86,8 @@ subroutine ensemble_manager_init()
if(ensemble_size > max_ensemble_size) call mpp_error(FATAL, &
'ensemble_manager_mod: ensemble_nml variable ensemble_size should be no larger than MAX_ENSEMBLE_SIZE, '// &
'change ensemble_size or increase MAX_ENSEMBLE_SIZE')
if(starting_ensemble_id < 1) call mpp_error(FATAL, &
'ensemble_manager_mod: ensemble_nml variable starting_ensemble_id must be a positive integer')

pe = mpp_pe()
npes = mpp_npes()
Expand Down Expand Up @@ -238,7 +241,7 @@ subroutine ensemble_pelist_setup(concurrent, atmos_npes, ocean_npes, land_npes,
integer :: atmos_pe_start, atmos_pe_end, ocean_pe_start, ocean_pe_end
integer :: land_pe_start, land_pe_end, ice_pe_start, ice_pe_end
character(len=10) :: pelist_name, text
integer :: npes, n, m ,i
integer :: npes, n, m ,i, global_ens

npes = total_npes_pm

Expand Down Expand Up @@ -401,7 +404,8 @@ subroutine ensemble_pelist_setup(concurrent, atmos_npes, ocean_npes, land_npes,
!can be used for non-ensemble experiments
!
if (ensemble_size > 1) then
write( text,'(a,i2.2)' ) 'ens_', ensemble_id
global_ens = starting_ensemble_id + ensemble_id - 1
write( text,'(a,i2.2)' ) 'ens_', global_ens
!Append ensemble_id to the restart filenames
call fms2_io_set_filename_appendix(trim(text))
endif
Expand Down
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