JIM and SAMGrid for CDF Mòrag Burgon-Lyon University of Glasgow

11stst December 2003 December 2003 JIM for CDFJIM for CDF 1

JIM and JIM and SAMGrid for SAMGrid for

CDFCDF

Mòrag Burgon-LyonMòrag Burgon-Lyon University of GlasgowUniversity of Glasgow


ContentsContents

• What is JIM?• What is SAMGrid?• How does JIM relate to SAMGrid?• Components of JIM• Using JIM• Job Types• Station Setup• Deployment Plan


What is What is JIMJIM??

Job and Information Management

• Job Management Infrastructure is the framework allowing job submissions for execution on a cluster that has enough resources to complete the job.

• Information Management is knowing what resources are available and the status of the jobs.


What is SAMGrid?What is SAMGrid?

• SAMGrid is a grid infrastructure whose goal is to allow globally distributed computing for current experiments, DØ, CDF and Minos at Fermilab.

• Communicating with LHC experiments CMS (Fermilab) and Atlas (Brookhaven)


How does JIM relate to SAMGrid?How does JIM relate to SAMGrid?

Complements Sequencial Access via Metadata to provide complete grid services

Job ManagementInformation

and Monitoring

Data Handling





• JIM allows a user to submit jobs to SAMGrid and to access the output files on completion.

• JIM chooses which resources will be used to execute a job. This decision is based on the amount of data required by the job already cached at the sites.

• JIM submits the job to the local BS and SAM provides the I/O data management for the files.



• Condor MMS was expanded for SAMGrid– broker can query SAM station to see how much

data is already present.– dynamic selection of a globus gatekeeper.– the match is determined by calling by calling

external custom code, e.g. in SAMGrid the SAM station is invoked to determine the rank of a match.

• Globus toolkit is used for job transfer and monitoring



• Distinguishes grid level (global) scheduling (selection of a cluster to run) from local scheduling (distribution of the job within the cluster).

• Distinguishes structured jobs (where the details are known to Grid middleware) from unstructured jobs (where the whole job is mapped onto a single cluster).


Components of JIMComponents of JIM

• All Sites– sam_gsi_config (includes sam_gridftp and

globus_dh_client and server) for grid security

– xmldb as a SAMGrid interface• Client Site - used to submit jobs to SAMGrid

– typically a remote server or workstation that is used to send jobs to a Submission site

– jim-client



• Submission Site - maintains a spool of jobs– acts as a client to the broker periodically sending

jobs to available resources at an Execution site– jim_broker_client– www_jim_sandbox (optional)



• Execution Site - runs the job– sam and sam_station

– sam_batch_adapter

– globus_rm_server – jim_jobmanager– jim_sandbox– jim_config and jim_advertise



• Monitoring Site - provides information on the state of each submitted job and allows the output of completed jobs to be downloaded– globus_is_server and globus_is_client

– jim_info_providers


Using JIM – Submitting a jobUsing JIM – Submitting a job

User creates a jdl file such as the example shown:

sam_dataset = jpmm08-1fileexecutable = retrieve.shinput_sandbox = /home_scotgrid/m/mlyon/test/testjobcpu-per-event = 1sjob_manager = samjob_type = sam_analysissam_universe = prdsam_experiment = cdflog = testjob.logoutput = testjob.outerror = testjob.errarguments = Download Output Yet?group = testinstances = 1


Using JIM – Submitting a jobUsing JIM – Submitting a job

• The job is submitted by typing:

samg submit testjobfile.jdf• The progress of the job can be viewed by selecting

the submission site from the list:

http://samgrid.fnal.gov:8080• Select the job from the list. Details of the job state

are displayed• Once the job has been completed the output may

be downloaded

http://samgrid.fnal.gov:8080/list_of_schedulers.php


Using JIM – Viewing MapUsing JIM – Viewing Map


Using JIM – Viewing submission sitesUsing JIM – Viewing submission sites


Using JIM – Viewing submitted jobsUsing JIM – Viewing submitted jobs


Using JIM – Downloading outputUsing JIM – Downloading output


Types of JobsTypes of Jobs

• Monte Carlo– events generated, passed through detector simulation

and reconstructed– e.g. typically no input files, one output file per job– Each job part of a well defined (generator, parameters)

set going to a given dataset

• Reconstruction– real data reconstruction– in general one input file from a dataset going to one

output file in corresponding dataset

• Analysis– an entire dataset is input, many input files


Station SetupStation Setup

• Initial installation uses current versions of all products.

• Care must be taken when upgrading – to avoid version incompatibility– to preserve existing configuration


What will JIM do once complete?What will JIM do once complete?

• Current functionality allows job submission and output retrieval

• Next steps:– Deployment of secure web-download– User support and defect fixing through testing phase– Roll out of SAMGrid to all CDF sites with available

resources– Add more brokering criteria

• Directors review of Run II computing has recommended the expansion of SAM to be a lab-wide product


Deployment PlanDeployment Plan

• Glasgow University has a complete installation of SAMGrid on both ScotGrid and the CDF cluster. This installation is being tested with Monte Carlo simulation.

• Oxford University has SAMGrid installed.

• Installation workshop organised for 20th-22nd Jan 04


CreditsCredits

• Thanks to the JIM team for providing material for this presentation.

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JIM and SAMGrid for CDF Mòrag Burgon-Lyon University of Glasgow

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