The NorduGrid toolkit user interface Mattias Ellert Presented at the 3 rd NorduGrid workshop, Helsinki, 2002-05-23.

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Presentation transcript:

The NorduGrid toolkit user interface Mattias Ellert Presented at the 3 rd NorduGrid workshop, Helsinki,

05/24/02 1 Mattias Ellert, The NorduGrid toolkit user interface The User Interface ● The NorduGrid toolkit user interface consists of a set of commands that can be executed from the command line ● ngsub - for job submission ● ngstat - to obtain the status of jobs and clusters ● ngcat - to display the stdout or stderr of a running job ● ngget - to retrieve the result from a finished job ● ngkill - to kill a running job ● ngclean - to delete a job from a remote cluster ● ngsync

05/24/02 1 Mattias Ellert, The NorduGrid toolkit user interface Job Submission ● The ngsub command is used to submit a job to a NorduGrid cluster ● The job and the resources needed to run it should be described using the extended resourse specification language (XRSL) - see Oxana's talk ● The XRSL string can be given as an argument: ngsub '&(executable=myprog.exe)' ● or be read from a file: ngsub -f myjob.xrsl

05/24/02 1 Mattias Ellert, The NorduGrid toolkit user interface Brokering - where do jobs go? ● The user interface contains a broker that decides to which queue at which cluster a job should be submitted ● The decision is made based on information about the different clusters obtained from the MDS servers on the clusters - see Balázs's talk about information providers

05/24/02 1 Mattias Ellert, The NorduGrid toolkit user interface Brokering algorithm ● The status of the cluster and the queue must be 'active'. ● The user must be authorized to use the cluster and the queue ● The cluster's and queue's characteristics must match the requirements specified in the xrsl string (max CPU time, required free diskspace, installed software etc)

05/24/02 1 Mattias Ellert, The NorduGrid toolkit user interface Brokering algorithm (cont) ● From all queues that fulfills the criteria one is chosen randomly, with a weight proportional to the number of free CPUs available for the user in each queue ● If the are no available CPUs in any of the queues, the job is submitted to the queue with the lowest number of queued job per processor

05/24/02 1 Mattias Ellert, The NorduGrid toolkit user interface User's Manual ● A user's manual for the NorduGrid toolkit user interface describing the commands and all their options is available from the NorduGrid website

05/24/02 1 Mattias Ellert, The NorduGrid toolkit user interface Examples ● The demo later today will give plenty of examples on how to use the different user interface commands with various options

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