wiki:WRF4GTutorial

Version 46 (modified by carlos, 10 years ago) (diff)

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Run a simple experiment on the machine where WRF4G is installed

Before you start this tutorial make sure that WRF4G is correctly installed in your machine. To do so follow the Installation instructions

Start wrf4g_framework and list computing resources

Simply start the WRF4G Framework:

[user@mycomputer~]$ wrf4g_framework start

By doing this, we will start the services that manage the computing resources and keep track of the experiments.

Note that if you do not start wrf4g_framework you won't be able to work with WRF4G.

WRF4G framework is configured to use a single computing resource by default(the computer where WRF4G has been installed). To list the computing resources where you can submit the experiment (in this case only localhost) run the following:

[user@mycomputer~]$ wrf4g_resources 
HID PRIO OS              ARCH   MHZ  %CPU    MEM(F/T)     DISK(F/T)      N(U/F/T) LRMS               HOSTNAME                      
0   1    GNU/Linux2.6.32 x86_64 2000    0    439/3270     1143/8662         0/1/1 FORK               mycomputer   

Prepare and submit the test experiment

Go to the directory where the experiment configuration files are located:

[user@mycomputer~]$ cd $WRF4G_LOCATION/experiments/single_test

Edit experiment.wrf4g and check its configuration.

Run wrf4g_prepare to prepare the experiment:

[user@mycomputer~]$ wrf4g_prepare
Preparing namelist...
WRFV3/run/namelist.input
WRF Check Warning: CAM radiation selected but paerlev/levsiz/cam_abs_dim1/cam_abs_dim2 was not set. Fixing...
WRF Check Warning: radt is shorter than dx (0.500000)

---> Single params run
---> Continuous run
        ---> cycle_chunks: test 2011-08-28_12:00:00 2011-08-30_00:00:00
                ---> chunks 1: test 2011-08-28_12:00:00 2011-08-29_00:00:00
                ---> chunks 2: test 2011-08-29_00:00:00 2011-08-29_12:00:00
                ---> chunks 3: test 2011-08-29_12:00:00 2011-08-30_00:00:00

Check the experiment status with wrf4g_status. You will see that the experiment is in P (Prepared status).

[user@mycomputer~]$ wrf4g_status 
Experiment P   W   R   D   F  
test       1   0   0   0   0 

[user@mycomputer~]$ wrf4g_status --long
Realization        GW  Stat Chunks Comp.Res   WN         Run.Sta       ext   %
test               -     P     0/3        -    -        Prepared       -  0.00

Submit the experiment with wrf4g_submit and check the status for a minute. You will see how the status of the experiment change into: submitted, downloading input data, ungrib, metgrid, real and wrf.

[user@mycomputer~]$ wrf4g_submit 
Submitting realization: "test"
        Submitting Chunk 1:     2011-08-28_12:00:00     2011-08-29_00:00:00
        Submitting Chunk 2:     2011-08-29_00:00:00     2011-08-29_12:00:00
        Submitting Chunk 3:     2011-08-29_12:00:00     2011-08-30_00:00:00

[user@mycomputer~]$ wrf4g_status 
Experiment P   W   R   D   F  
test       0   1   0   0   0 

[user@mycomputer~]$ wrf4g_status --long 
Realization        GW  Stat Chunks Comp.Res   WN         Run.Sta       ext   %
test               0     W  1/3    -          -          Submitted       - 0.00

[user@mycomputer~]$ wrf4g_status --long
Realization        GW  Stat Chunks Comp.Res   WN         Run.Sta       ext   %
test               0     R  1/3    mycomputer mycomputer real            - 0.00

[user@mycomputer~]$ wrf4g_status --long
Realization        GW  Stat Chunks Comp.Res   WN         Run.Sta       ext   %
test               0     R  1/3    mycomputer mycomputer WRF             - 0.00

[user@mycomputer~]$ wrf4g_status --long
Realization        GW  Stat Chunks Comp.Res   WN         Run.Sta       ext   %
test               0     R  2/3    mycomputer mycomputer Submitted       - 33.33


[user@mycomputer~]$ wrf4g_status --long
Realization        GW  Stat Chunks Comp.Res   WN         Run.Sta       ext   %
test               0     R  3/3    mycomputer mycomputer Finished        0 100.00

The experiment has to finish with ext option equals 0 code which means it has finalized correctly. If ext has a different code, you can look up more information about it in WRF4G errors

Check the experiment output and log

The location where output and log files are stored is defined with the WRF4G_BASEPATH variable in resources.wrf4g. Check $WRF4G_LOCATION/etc/resources.wrf4g to find where WRF4G_BASEPATH is pointing. You will see that it is pointing to WRF4G_LOCATION/repository/output. Go to WRF4G_LOCATION/repository/output/test/test and see the directory structure and the output files.

[user@mycomputer~]$ ls -lh /home/user/WRF4G/repository/output/test/test/output
total 420K
-rw-rw-r-- 1 user user 6.2K 2011-10-28 12:40 wrf24hc_d01_20110828T120000Z_20110828T120000Z.nc
-rw-rw-r-- 1 user user 6.2K 2011-10-28 12:41 wrf24hc_d01_20110829T000000Z_20110829T000000Z.nc
-rw-rw-r-- 1 user user 6.2K 2011-10-28 12:43 wrf24hc_d01_20110829T120000Z_20110829T120000Z.nc
-rw-rw-r-- 1 user user 14K 2011-10-28 12:40 wrfout_d01_20110828T120000Z_20110828T180000Z.nc
-rw-rw-r-- 1 user user 11K 2011-10-28 12:40 wrfout_d01_20110828T210000Z_20110829T000000Z.nc
-rw-rw-r-- 1 user user 14K 2011-10-28 12:41 wrfout_d01_20110829T000000Z_20110829T060000Z.nc
-rw-rw-r-- 1 user user 11K 2011-10-28 12:41 wrfout_d01_20110829T090000Z_20110829T120000Z.nc
-rw-rw-r-- 1 user user 14K 2011-10-28 12:43 wrfout_d01_20110829T120000Z_20110829T180000Z.nc
-rw-rw-r-- 1 user user 11K 2011-10-28 12:43 wrfout_d01_20110829T210000Z_20110830T000000Z.nc
-rw-rw-r-- 1 user user 3.4K 2011-10-28 12:40 wrfrain_d01_20110828T190000Z_20110828T190000Z.nc
-rw-rw-r-- 1 user user 3.4K 2011-10-28 12:41 wrfrain_d01_20110829T070000Z_20110829T070000Z.nc
-rw-rw-r-- 1 user user 3.4K 2011-10-28 12:43 wrfrain_d01_20110829T190000Z_20110829T190000Z.nc
-rw-rw-r-- 1 user user 99K 2011-10-28 12:40 wrfxtrm_d01_20110828T120000Z_20110829T000000Z.nc
-rw-rw-r-- 1 user user 99K 2011-10-28 12:41 wrfxtrm_d01_20110829T000000Z_20110829T120000Z.nc
-rw-rw-r-- 1 user user 99K 2011-10-28 12:43 wrfxtrm_d01_20110829T120000Z_20110830T000000Z.nc

[user@mycomputer~]$ tree /home/user/WRF4G/repository/output/test/test
.
├── log
│   ├── log_1_1.tar.gz
│   ├── log_2_2.tar.gz
│   └── log_3_3.tar.gz
├── namelist.input
├── output
│   ├── wrfout_d01_19830825T120000Z_19830825T233000Z.nc
│   ├── wrfout_d01_19830826T000000Z_19830826T000000Z.nc
│   ├── wrfout_d01_19830826T000000Z_19830826T113000Z.nc
│   ├── wrfout_d01_19830826T120000Z_19830826T120000Z.nc
│   ├── wrfout_d01_19830826T120000Z_19830826T233000Z.nc
│   ├── wrfout_d01_19830827T000000Z_19830827T000000Z.nc
│   ├── wrfrain_d01_19830826T000000Z_19830826T000000Z.nc
│   ├── wrfrain_d01_19830826T120000Z_19830826T120000Z.nc
│   ├── wrfrain_d01_19830827T000000Z_19830827T000000Z.nc
│   ├── wrfxtrm_d01_19830825T120000Z_19830825T233000Z.nc
│   ├── wrfxtrm_d01_19830826T000000Z_19830826T000000Z.nc
│   ├── wrfxtrm_d01_19830826T000000Z_19830826T113000Z.nc
│   ├── wrfxtrm_d01_19830826T120000Z_19830826T120000Z.nc
│   ├── wrfxtrm_d01_19830826T120000Z_19830826T233000Z.nc
│   └── wrfxtrm_d01_19830827T000000Z_19830827T000000Z.nc
├── realout
└── restart
    ├── wrfrst_d01_19830826T000000Z.nc
    ├── wrfrst_d01_19830826T120000Z.nc
    └── wrfrst_d01_19830827T000000Z.nc

In order to improve your knowledge about WRF4G, read portion 2 of this tutorial