APE CAM/HOMME Benchmark Results

Benchmark results with CAM 3.5 physics

• https://svn-ccsm-models.cgd.ucar.edu/cam1/branches/homme_cam3_5_29
• Resolution:
  • Physics dtime = 30min. Subcycled dynamics.
  • NE=16 26 Levels (1.9 degree) dt=3min (1536 elements, 13826 columns)
  • NE=21 26 Levels (1.43 degree) dt=2min (2646 elements, 24K columns) 252 points along equator (~T85)
  • NE=30 26 Levels (1.00 degree) dt=1.5 min (5400 elements, 49K columns)
  • NE=60 26 Levels (.50 degree) dt=45s (21600 elements, 194K columns)
  • NE=120 26 Levels (.25 degree) dt=20s (86400 elements, 778K columns)
• Model was run for NCPU/3 days (about 10 min runs). SYPD taken from stdout, best out of two simulations.
• qneg3.F90: tolerence changed to 1e-3 to avoid QNEG3 messages to stdout.
• most I/O disabled
• namelists: drv_in atm_in
• Using standard CAM datasets, except for a symmetric ozone dataset (APE.o3_64x1_L59_c060929.nc) and two grid dependent datasets (created from EUL T85 datasets via interpic_new tool):
  • AerosolMass_V_ne21np4_clim_c070730.nc
  • cami_0000-01-01_ne21np4_L26_ape_c071210.nc
• All datasets are now installed at NCAR (but namelists above need to be updated for NCAR names/locations)

Results from LLNL IBM BG/L

Each curve shows the fixed mesh scalability

This is the same data as plotted above, except the x-axis is changed to elements per processor, to show that each resolution has good scalability down to 1 element per processor.

Results from Sandia/Thunderbird

Linux cluster, 4480 nodes, dual 3.6 GHz Intel EM64T processors. These results are from the older homme_cam3_5_23 branch.