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CCSM Research Tools: CAM 3.0.p1 Release Notes

CAM-3.0.p1 is the first patched version of CAM-3.0 which includes minor bug fixes and portability enhancements. Simulations produced by this release will be bit for bit identical to simulations produced using CAM-3.0 in all configurations for which control simulations have been provided. The bug fixes, listed below, are mainly relevent to the use of non-default CAM configurations.

Bug Fixes

Issue: Run fails when using a non-default vertical resolution which extends the top of the model above 1 mb.

Resolution: The problem was due to uninitialized arrays returned from subroutine pcond.

Files modified: atm/cam/src/physics/cam1/cldwat.F90

Issue: Model produced different answers when using different numbers of mpi tasks and specifying non-default values of kmxhdc via the namelist.

Resolution: There was a bug in communicating the input namelist variables kmxhdc, dif2, and dif4.

Files modified: atm/cam/src/control/runtime_opts.F90

Issue: Model produced different answers when using different numbers of mpi tasks and specifying non-default values of kmxhdc via the namelist.

Resolution: The problem was due to an out of bounds array reference in iceini (ice_data.F90). The value of the out of bounds reference was not used so this bug did not cause an error in the model run.

Files modified: ice/csim4/ice_data.F90

Issue: CCSM-3.0 doesn't work with FV 2D composition.

Resolution: Art Mirin supplied the fix. Only part of the fix is included here. There is also a fix required in the CCSM scripts.

Files modified: atm/cam/src/control/ccsm_msg.F90

Issue: Strings for system commands passed to .c routines from fortran are being mishandled.

Resolution: Use the csm share code which properly handles the string passing for system calls.

Files removed: atm/cam/src/control/ioFileMod.F90 lnd/clm2/src/main/fileutils.F90

Files modified: atm/cam/src/control/ioFileMod.F90 lnd/clm2/src/main/fileutils.F90

Issue: Batch jobs will hang on IBM machines when ENDRUN is called and the xl__trbk tries to provide a trace of the failure.

Resolution: Close unit 5 (standard input) prior to call to xl__trbk. The problem seems to involve the routine's inability to properly flush standard input.

Files modified: atm/cam/src/control/abortutils.F90

Issue: Non-default load balancing options (e.g., phys_loadbalance=1) and extra constituents (e.g., run with greenhouse gas chemistry enabled) resulted in run time errors under linux/lf95/debug.

Resolution: The array "chunk_buffer" in subroutine transpose_chunk_to_block was improperly declareded intent(out) rather than intent(in). Thanks to Steve Ghan for finding this bug.

Files modified: atm/cam/src/physics/cam1/phys_grid.F90

Issue: Default settings for the optimization level of the pgi compilers give different answers in pure mpi mode depending on the number of mpi tasks used.

Resolution: Problem was fixed by dropping the optimization level from -fast to -O2 and removing the option -Mrecursive in non-debug mode. The option -Mrecursive is now used only in debug mode, giving bit-for-bit results between pure mpi, pure smp, hybrid and serial runs.

Files modified: atm/cam/bld/Makefile

Portability Enhancements

Linux/Intel build:

  ESMF builds for linux_intel and linux_altix have been added.  Currently
  only the linux_intel build has been implemented for CAM.

  *** NOTE *** The linux_intel build has not been validated to produce an
  acceptable climate.  The build is provided "as is" to help users who wish
  to experiment with this compiler.

  Files added:
  utils/esmf/build/linux_altix/ESMF_conf.h
  utils/esmf/build/linux_altix/base
  utils/esmf/build/linux_altix/base.site
  utils/esmf/build/linux_altix/base_variables
  utils/esmf/build/linux_altix/fix.h
  utils/esmf/build/linux_intel/ESMF_conf.h
  utils/esmf/build/linux_intel/base
  utils/esmf/build/linux_intel/base.site
  utils/esmf/build/linux_intel/base_variables
  utils/esmf/build/linux_intel/fix.h

  Files modified:
  atm/cam/bld/Makefile
  lnd/clm2/src/biogeophys/Hydrology2Mod.F90
  lnd/clm2/src/main/histFileMod.F90
  utils/timing/t_pr.c

  utils/timing/t_pclstr.c
  utils/timing/t_stop.c

  utils/esmf/src/Infrastructure/Error/ESMC_Error.c
  utils/esmf/src/Infrastructure/TimeMgmt/ESMC_Alarm.c
  utils/esmf/src/Infrastructure/TimeMgmt/ESMC_Calendar.c
  utils/esmf/src/Infrastructure/TimeMgmt/ESMC_Date.c
  utils/esmf/src/Infrastructure/TimeMgmt/ESMC_Time.c
  utils/esmf/src/Infrastructure/TimeMgmt/ESMC_TOD.c

Darwin build:

 
  ESMF builds for Darwin_absoft and Darwin_xlf have been added.  Neither of
  these platforms are currently implemented in the CAM build.

  Files added:
  utils/esmf/build/Darwin_absoft/ESMF_conf.h
  utils/esmf/build/Darwin_absoft/base
  utils/esmf/build/Darwin_absoft/base.site
  utils/esmf/build/Darwin_absoft/base_variables
  utils/esmf/build/Darwin_absoft/fix.h
  utils/esmf/build/Darwin_xlf/ESMF_conf.h
  utils/esmf/build/Darwin_xlf/base
  utils/esmf/build/Darwin_xlf/base.site
  utils/esmf/build/Darwin_xlf/base_variables

  Files modified:
  utils/esmf/README
  utils/esmf/build/common

Miscellaneous Changes

Description: Minor enhancements to supplied sample run scripts. Clarification in the information provided for using the SOM tool definemld.

Files modified:
atm/cam/bld/CAM_config.pm
atm/cam/bld/CAM_namelist.pm
atm/cam/tools/definemld/README