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7. (Optional) Check namelist settings in the namelist files user_nl_cam and user_nl_clm. Most CAM-chem related namelist variables are in CaseDocs/atm_in, but MEGAN and drydep are in CaseDocs/drv_flds_in (these files are created during build).  To modify any of these, copy the appropriate lines to user_nl_cam and edit there.

For example, if the startdate has been changed in env_run.xml, you have to also change the date of the initial meteorology file in user_nl_cam to start at the corresponding date.

For other changes see namelist changes or advanced options page.


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Tip
titleTip for New Users:

There are many namelist variables. You can find their definitions at:http://www.cesm.ucar.edu/models/cesm2/settings/current/cam_nml.html



After adding changes to user_nl_* files, optionally run:

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>./preview_namelists

NOTE: most changes in user_nl_* files do not require re-building. However, during a run (CONTINUE_RUN = TRUE) no changes can be made to history output (fincl lists). If you want to change history output, create a new or branch run

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titleTip for New Users:

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Note
titleNote

Note, the pe-layout of existing compsets in the new code base of CESM2 for derecho (cesm2.2.2) has not been adjusted to the new computer, and running out of the box can lead to large differences in computer costs compared to running on cheyenne. 

New PE-layouts are still being developed. We are working on updating these compsets. One way to increase performance is to use a namelist setting. To improve improve the performance of derecho, you can add the following to your user_nl_cam file.

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phys_loadbalance = 1


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