braczka
commented
6 months ago I have a working version of the CLM-DART shell scripting for Derecho. I checked out a new Derecho compatible ctsm tag (release-cesm2.2.03) that was very close to the cesm tag I was using for cheyenne (release-cesm2.2.0). The tag is close enough where I didn't have to modify the DART SourceMods at all. Preliminary comparison with the CLM-DART tutorial suggests nearly identical behavior between cheyenne and derecho versions.
I encountered sluggish behavior when starting the clm runs during the reading of the CAM6 reanalysis. This sluggish behavior seems to have coincided with the migration of the CAM6 to the RDA campaign directory. This behavior occurs whether running on derecho or cheyenne. When using the "datm.streams.txt.CPLHISTForcingcomplete" stream files it took about 25-30 minutes of wall time just to initialize the CAM files (all years 2011-2019). If I used the "datm.streams.txt.CPLHISTForcingsingle_year" stream file (which initializes only one year, 2011) things sped up considerably (full tutorial run time, 14 minutes on cheyenne and 10 minutes on derecho). The 'complete' and 'single_year' datm streamlist files were created to address runtime issues when initializing multiple years versus single years runs. In recent memory, however, the runtime differences between the complete and single_year streamlist files wasn't as distinct. This sluggish behavior only occurs during the first time step, whereas all subsequent forecast steps did not experience this behavior.
Will issue PR soon -- currently running some tests where CAM reanalysis files are on scratch directory to better diagnose sluggish runtime behavior.
hkershaw-brown
Use case
The CLM-DART shell scripts need to reflect updated paths and options compatible with Derecho, supplanting the decommissioned Cheyenne
Is your feature request related to a problem?
Not really, although users have reported sluggish responses with CLM-DART on Derecho in reading CAM6 reanalysis. Need to determine whether this is related to particular Derecho compatible CESM tag, or related to campaign storage or some other yet unidentified issue.
Describe your preferred solution
Implement CLM-DART tutorial test case on Derecho using CTSM repository tag release-cesm2.2.03, closest to previously used tag (release-cesm2.2.0). Preliminary work suggests these tags are compatible with existing SourceMods. This would require an update to the CLM documentation as well.