ARC Computing Element

Leverage the arc Python library to interact with ARC gridftp services.

Configuration Parameters

Configuration for the ARCComputingElement submission can be done via the configuration system.


Log level of the ARC logging library. Possible values are: DEBUG, VERBOSE, INFO, WARNING, ERROR, FATAL


Name of the protocol to use to interact with ARC services: Emies and Gridftp are supported. Gridftp communicates with gridftpd services providing authentication and encryption for file transfers. ARC developers are going to drop it in the future. Emies is another protocol that allows to interact with A-REX services that provide additional features (support of OIDC tokens).


The host for the ARC CE, used to overwrite the CE name.


Line that should be executed just before the executable file.


Directory where the pilot log files are stored locally. For instance:


Default additional string for ARC submit files. Should be written in the following format:

(key = "value")

Please note that for ARC & ARC6, any times (such as wall or CPU time) in the XRSL should be specified in minutes. For AREX, these times should be given in seconds (see


Default additional string for ARC submit files for multi-processor jobs. Should be written in the following format:

(key = "value")

The XRSLExtraString note about times also applies to this configuration option.

Code Documentation

class DIRAC.Resources.Computing.ARCComputingElement.ARCComputingElement(ceUniqueID)

Bases: DIRAC.Resources.Computing.ComputingElement.ComputingElement


Standard constructor.


This method returns the number of available slots in the target CE. The CE instance polls for waiting and running jobs and compares to the limits in the CE parameters.


jobIDList (list) – list of already existing job IDs to be checked against


Method to return information on running and pending jobs. We hope to satisfy both instances that use robot proxies and those which use proper configurations.


Get CE description as a dictionary.

This is called by the JobAgent for the case of “inner” CEs.

getJobOutput(jobID, workingDirectory=None)

Get the specified job standard output and error files. Standard output and error are returned as strings. If further outputs are retrieved, they are stored in workingDirectory.


Get the status information for the given list of jobs


Initialize the CE parameters after they are collected from various sources


Check if the stored proxy is valid


Check the sanity of the Computing Element definition


Kill the specified jobs


Instantiate object representing the backend batch system


batchSystemName (str) – name of the batch system

sendOutput(stdid, line)

Callback function such that the results from the CE may be returned.


Update the CPUTime parameter of the CE classAd, necessary for running in filling mode


Add parameters from the given dictionary overriding the previous values


ceOptions (dict) – CE parameters dictionary to update already defined ones

setProxy(proxy, valid=0)

Set proxy for this instance


Optional method to shutdown the (Inner) Computing Element

submitJob(executableFile, proxy, numberOfJobs=1, inputs=None, outputs=None)

Method to submit job


CE helper function to write a CE proxy string to a file.