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Add a comment in eri.py about a possible error this can catch #4959

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billsacks merged 2 commits into from
Apr 9, 2026
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Add a comment in eri.py about a possible error this can catch #4959

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4e7af19
Add a comment in eri.py about a possible error this can catch
billsacks Apr 9, 2026
28fe4b5
Add comment on ERI test in system_testing.rst
billsacks Apr 9, 2026
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9 changes: 9 additions & 0 deletions CIME/SystemTests/eri.py
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Expand Up @@ -223,6 +223,15 @@ def run_phase(self):
# (3a) Test run:
# do a branch run from ref2 restart (short term archiving is off)
#
# One aspect of this branch run worth noting is that it writes an extra set of
# restart files in the middle of the run, which are not written in the reference
# case. (These restart files are needed for the final continue run.) This is one
# of the few (or only) instances in the CIME System Tests where we do a comparison
# between two runs where one run has written an extra set of restart files
# part-way through. This can catch a particular type of error that arises
# occasionally: where the mere act of *writing* a restart file can change answers.
# (See also the discussion in https://github.com/ESMCI/cime/issues/4859.)
#

os.chdir(caseroot)
self._set_active_case(orig_case)
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8 changes: 8 additions & 0 deletions doc/source/system_testing.rst
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Expand Up @@ -243,6 +243,14 @@ TESTTYPE Description
Do a branch run, starting from restarts written in ref2case,
for 9 days and writing restarts at day 5.
Short term archiving is off.

One aspect of this branch run worth noting is that it writes an extra set of
restart files in the middle of the run, which are not written in the reference
case. (These restart files are needed for the final continue run.) This is one
of the few (or only) instances in the CIME System Tests where we do a comparison
between two runs where one run has written an extra set of restart files
part-way through. This can catch a particular type of error that arises
occasionally: where the mere act of *writing* a restart file can change answers.
case - restart (Suffix rest)
Do a restart run from the branch run restarts for 4 days.
Short term archiving is off.
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