LocalComputingElement

LocalComputingElement is a class to handle non-grid computing clusters

Allows direct submission to underlying Batch Systems.

Configuration Parameters

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

BatchError:

Area where the job errors are stored. If not defined: SharedArea + ‘/data’ is used. If not absolute: SharedArea + path is used.

BatchOutput:

Area where the job outputs are stored. If not defined: SharedArea + ‘/data’ is used. If not absolute: SharedArea + path is used.

BatchSystem:

Underlying batch system that is going to be used to orchestrate executable files. The Batch System has to be accessible from the LocalCE. By default, the LocalComputingElement submits directly on the host via the Host class.

ExecutableArea:

Area where the executable files are stored if necessary. If not defined: SharedArea + ‘/data’ is used. If not absolute: SharedArea + path is used.

SharedArea:

Area used to store executable/output/error files if they are not aready defined via BatchOutput, BatchError, InfoArea, ExecutableArea and/or WorkArea. The path should be absolute.

Code Documentation

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

Bases: ComputingElement

__init__(ceUniqueID)

Standard constructor.

available(jobIDList=None)

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.

Parameters:

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

getCEStatus()

Method to return information on running and pending jobs.

getDescription()

Get CE description as a dictionary.

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

getJobOutput(jobID, localDir=None)

Get the specified job standard output and error files. If the localDir is provided, the output is returned as file in this directory. Otherwise, the output is returned as strings.

getJobStatus(jobIDList)

Get the status information for the given list of jobs

initializeParameters()

Initialize the CE parameters after they are collected from various sources

isProxyValid(valid=1000)

Check if the stored proxy is valid

isValid()

Check the sanity of the Computing Element definition

killJob(jobIDList)

Kill a bunch of jobs

loadBatchSystem(batchSystemName)

Instantiate object representing the backend batch system

Parameters:

batchSystemName (str) – name of the batch system

sendOutput(stdid, line)

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

setCPUTimeLeft(cpuTimeLeft=None)

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

setParameters(ceOptions)

Add parameters from the given dictionary overriding the previous values

Parameters:

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

setProxy(proxy, valid=0)

Set proxy for this instance

setToken(token)

shutdown()

Optional method to shutdown the (Inner) Computing Element

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

Method to submit job, should be overridden in sub-class.

writeProxyToFile(proxy)

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