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Yerba is the job execution engine used by CoGe. CoGe is in the process of moving all analysis to the job execution framework.  The job execution framework allows analysis to run in a heterogeneous environment. An analysis can then be run in an environment which best suits its computational needs. An analysis will be run as a workflow which may contain multiple tasks to be run.

High level diagram illustrating how tools on CoGe have jobs processed.


For installation instructions please refer to the git repository or the in the repository.

To clone the repository run the command:

git clone


Yerba has two components the job daemon yerbad and the command line client yerba. The job daemon is started started when the server is first booted. Additionally, cctool's catalog and worker pool need to be running. yerba' is a command line interface to the job engine to check the status of the job engine. More features are planned in the future.


To (manually) start the job engine you need to start each script.

sudo start catalog_server
sudo start work_queue_pool
sudo start yerba


This command currently only checks for a response from the job engine.


Another method to check the status of the job engine is: status yerba

CoGe yerba utilities

CoGe has several utilities that provide functionality beyond the scope of the job engine.


This script keeps the CoGe jobs table up to date. By default the command will perform a dry run and not update the database.

coge/scripts/update-jobs coge.conf

To update the database the command can then be ran with the update argument.

coge/scripts/update-jobs coge.conf --update