= FAQ =

[[PageOutline()]]

This page will try to answer the most common questions about WRF4G.

== Failed connection to gwd ==
If you execute `wrf4g_submit` and see this error, you will probably has !GridWay in ''Stopped'' status:
{{{
#!sh
[user@mycomputer~]$ wrf4g_submit -e test
connect(): Connection refused
FAILED: failed connection to gwd 
}}}

In order to solve the problem, first, you have to check out the `wrf4g_framework` status. 
{{{
#!sh
[user@mycomputer~]$ wrf4g_framework status
GridWay Stopped
MySQL Stopped
}}}
Then you have to execute `wrf4g_framework start`:
{{{
#!sh
[user@mycomputer~]$ wrf4g_framework start
Starting GridWay.......  OK
Starting MySQL.......  OK
}}}

== How can I reconfigure the features of my experiment ? ==
If you want to reconfigure the features of one experiment and you execute `wrf4g_prepare`, you will probably see: 
{{{
#!sh
[user@mycomputer~]$ wrf4g_prepare 
Warning: You are using resources.wrf4g located in the /home/carlos/WRF4G/etc/ directory.
Experiment already exists
}}}
In order to do it, you need to execute `wrf4g_prepare --reconfigure`.
{{{
#!sh
[user@mycomputer~]$ cat experiment.wrf4g | grep "end_date="\"
end_date="2011-08-30_00:00:00"

[user@mycomputer~]$ cat experiment.wrf4g | grep "end_date="\"
end_date="2011-09-01_00:00:00"

[user@mycomputer~]$ wrf4g_prepare --reconfigure
Warning: You are using resources.wrf4g located in the /home/carlos/WRF4G/etc/ directory.
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 2011-09-01_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
		---> chunks 4: test 2011-08-30_00:00:00 2011-08-30_12:00:00
		---> chunks 5: test 2011-08-30_12:00:00 2011-08-31_00:00:00
		---> chunks 6: test 2011-08-31_00:00:00 2011-08-31_12:00:00
		---> chunks 7: test 2011-08-31_12:00:00 2011-09-01_00:00:00

}}}

== What should I do if I want to resubmit an experiment ? ==
If one experiment has finished with an error and you want to rerun the experiment again. You have to execute:
{{{
#!sh
[user@mycomputer~]$ wrf4g_submit --rerun -f -e test1
Submitting realization: "test1"
	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
}}}

== What should I do if I want to rerun an specific chunk of a realization? ==

Imagine, you want to resubmit the chunk number '''1''' of the realization '''test2'''. In this case, it is highly recommended that you use the option `--dry-run` of `wrf4g_submit` command before you submit your chunk in order to make sure you are submitting that chunk an nothing else.
{{{
#!sh
[user@mycomputer~]$ wrf4g_submit --dry-run --rerun -c 1 -f -r test2
Submitting realization: "test2"
	Submitting Chunk 1:	2011-08-28_12:00:00	2011-08-29_00:00:00

[user@mycomputer~]$ wrf4g_submit --rerun -c 1 -f -r test2
Submitting realization: "test2"
	Submitting Chunk 1:	2011-08-28_12:00:00	2011-08-29_00:00:00
}}}