A production version of CAM can be built by entering the following commandsfrom the command line:% $CAM_ROOT/models/atm/cam/bld/configure% makeThis assumes:1) The shell variable CAM_ROOT has been set to the root directory of the CAM   distribution.  The root directory is the top level directory that is created   when the distribution is untarred.  It contains the subdirectories   models and scripts.2) make is a GNU Make (check by issuing "make -v").A namelist that will run CAM for a day is produced by issuing the command:% setenv CSM_DATA top_level_data_dir% $CAM_ROOT/models/atm/cam/bld/build-namelistThis assumes that the environment variable CSM_DATA has been set to the toplevel directory where the CAM data distribution has been untarred.  The toplevel directory contains the subdirectories atm and lnd.To run CAM interactively for a day issue the command:% ./cam < namelistThe configure and build-namelist scripts are fully documented in the CAMUser's Guide.Example self-contained run scripts are provided for the three architecturesavailable at NCAR on which CAM is known to run.  These are IBM SP, SGIOrigin, and PC running Linux.  On a PC, either pgf90 (Portland Group) or lf95(Lahey) compilers may be used.  The scripts are run-ibm.csh, run-pc.csh, and run-sgi.csh.Each script is set up to run the production configuration (T42L26 withEulerian dynamics).  Minimal changes to the scripts should be necessary if theyare run with this configuration on most machines at NCAR.  In order to runon machines at other locations, issues such as the location of the netcdflibrary, differences in the queueing system, and interface to a dataarchival device may need to be addressed.  Changing the model resolution orunderlying dynamical core will also require modifications.  Specifically,changes to the .h files and/or Filepath are needed.  The configure scriptproduces these files.Optimal execution speed of CAM is obtained on an IBM SP with a multitaskingstrategy that is hybrid OpenMP/MPI.  On an SGI Origin, pure OpenMP yields thebest speed.  The run scripts for these architectures are configuredaccordingly.  The script for a PC is configured to run pure MPI.