cam6_4_052: clubb_intr GPUization

doc/ChangeLog

@@ -1,5 +1,64 @@
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+Tag name: cam6_4_052
+Originator(s): huebleruwm, nusbaume
+Date: 6 Jan 2025
+One-line Summary: clubb_intr GPUization
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1175
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+
+Adds OpenACC directives to clubb_intr.F90 to enable GPU offloading of CLUBB.
+BFB on CPUs, answer changing (but passes ECT) on GPUs.
+
+Describe any changes made to build system: N/A
+
+Describe any changes made to the namelist: N/A
+
+List any changes to the defaults for the boundary datasets: N/A
+
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by: nusbaume, katetc, cacraigucar
+
+List all files eliminated: N/A
+
+List all files added and what they do: N/A
+
+List all existing files that have been modified, and describe the changes:
+M       src/physics/cam/clubb_intr.F90
+ - add OpenACC directives for GPU offloading
+ - add timer calls to evaulate performance
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below.  All failed tests must be justified.
+
+derecho/intel/aux_cam:
+
+  DIFF SMS_Lh12.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq3h
+  FAIL ERP_Ln9.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq9s
+ - pre-existing failure due to HEMCO not having reproducible results issues #1018 and #856
+
+  PEND SMS_D_Ln9.f19_f19_mg17.FXHIST.derecho_intel.cam-outfrq9s_amie
+  FAIL SMS_D_Ln9_P1280x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s
+ - pre-existing failures due to build-namelist error requiring CLM/CTSM external update.
+
+derecho/nvhpc/aux_cam:
+
+ERS_Ln9.ne30pg3_ne30pg3_mg17.F2000dev.derecho_nvhpc.cam-outfrq9s_gpu_default (Overall: FAIL)
+ - Expected baseline failures due to non-BFB answer changes with new CLUBB GPU-offloading.
+
+izumi/nag/aux_cam:
+  FAIL DAE.f45_f45_mg37.FHS94.izumi_nag.cam-dae
+ - pre-existing failure -- issue #670
+
+izumi/gnu/aux_cam: ALL PASS
+
+===============================================================
+===============================================================
+
 Tag name: cam6_4_051
 Originator(s): fvitt
 Date: 2 Jan 2025