How to add Neptuno facilities to WRF4G

WRF4G uses DRM4G to access to different Distributed Resource Managements (DRM) such as:

• PBS/Torque
• SGE
• FORK
• LoadLeveler
• SLURM

In order to add new resources, you need to edit Computing Resources section in the framework4g.conf file, which is located under $HOME/WRF4G/etc directory. The file has to contain one resource per line with the format:

   resource_name  = attributes
   ...     ...
   resource_name  = attributes

where:

• resource_name: It is the name of the CR.
• attributes: They are the static attributes of the CR. The syntax is:
  • <scheme>://<username>@<host:port>?<query>
    • scheme: URL schemes available are "ssh" and "local".
      • ssh: In order to connect to remote resource via SSH
      • local: In order to use a local resource
    • username: user name on the resource
    • host: host name
    • port: host port. By DEFAULT it is 22
    • query: contains additional information of computing resources. The query string syntax is:
      • key1=value1;key2=value2;key3=value3

The keys available are:

• LRMS_TYPE(mandatory): Type of LRMS system (neptuno)
• NODECOUNT(mandatory): Maximum number of job slots for a resource.
• SSH_KEY_FILE(optional): It defines the key file for "ssh" connection. By DEFAULT it is ~/.ssh/id_rsa.
• TEMP_DIR(optional): Temporary directory on the resource to store data. By DEFAULT it is $HOME. TEMP_DIR path must be absolute.
• RUN_DIR(optional): Temporary directory used to run WRF Model on the resource. By DEFAULT it is $HOME. RUN_DIR path must be absolute.

Example of configuration:

If you want to configure Neptuno facilities using ssh protocol, you need to set up SSH login without password (see Appendix B).

In addition, you need to update WRF4G_BASEPATH, WRF4G_DOMAINPATH, WRF4G_INPUT and WRF4G_APPS variables, which are defined in resources.wrf4g file. Due to the fact that these variables may point to other machines. See running environment for more information.

remote_PBS  =  ssh://userid@193.144.213.182?LRMS_TYPE=neptuno;NODECOUNT=1500

After modifying ComputingResources section, WRF4G takes few seconds in order to update the changes