WRF ARW User's Guide - MMM - UCAR

MODEL
The maximum number of time series locations is controlled by the namelist variable
max_ts_locs in namelist record &domains. The default value is 5. The time series
output is for a selected variables at the surface, including 2 m temperature, vapor mixing
ratio, 10 m wind components, u and v, rotated to the earth coordinate, etc.. More
information for time series output can be found in WRFV3/run/README.tslist.
n. Using IO Quilting
This option allows a few processors to be set alone to do output only. It can be useful and
performance-friendly if the domain sizes are large, and/or the time taken to write a output
time is getting significant when compared to the time taken to integrate the model in
between the output times. There are two variables for setting the option:
nio_tasks_per_group: How many processors to use per IO group for IO quilting.
Typically 1 or 2 processors should be sufficient for this
purpose.
nio_groups: How many IO groups for IO. Default is 1.
Check Output
Once a model run is completed, it is a good practice to check a couple of things quickly.
If you have run the model on multiple processors using MPI, you should have a number
of rsl.out.* and rsl.error.* files. Type ‘tail rsl.out.0000’ to see if you
get ‘SUCCESS COMPLETE WRF’. This is a good indication that the model has run
successfully.
The namelist options are written to a separate file: namelist.output.
Check the output times written to wrfout* file by using netCDF command:
ncdump –v Times wrfout_d01_yyyy-mm-dd_hh:00:00
Take a look at either rsl.out.0000 file or other standard out file. This file logs the
times taken to compute for one model time step, and to write one history and restart
output:
Timing for main: time 2006-01-21_23:55:00 on domain 2: 4.91110 elapsed seconds.
Timing for main: time 2006-01-21_23:56:00 on domain 2: 4.73350 elapsed seconds.
Timing for main: time 2006-01-21_23:57:00 on domain 2: 4.72360 elapsed seconds.
Timing for main: time 2006-01-21_23:57:00 on domain 1: 19.55880 elapsed seconds.
and
Timing for Writing wrfout_d02_2006-01-22_00:00:00 for domain 2: 1.17970 elapsed seconds.
Timing for main: time 2006-01-22_00:00:00 on domain 1: 27.66230 elapsed seconds.
Timing for Writing wrfout_d01_2006-01-22_00:00:00 for domain 1: 0.60250 elapsed seconds.
WRF-ARW V3: User’s Guide 5-22