Online Steering of HEP Grid Applications
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1 Online Steering of HEP Grid Applications Daniel Lorenz University of Siegen Cracow Grid Workshop Daniel Max Mustermann Lorenz Online Steering Folientitel of HEP Grid Applications CGW Veranstaltung `06
2 Outline Introduction Related work HEP environment Steering functionality Layer architecture Online grid connection Conclusion and outlook CGW Veranstaltung `06 1
3 Background: D-Grid German Grid initiative Funded by the Bundesministerium für Bildung und Forschung, BMBF 6 Community Grids and one common integration project HEP Community Grid (HEPCG) CGW Veranstaltung `06 2
4 Introduction New particle accelerator LHC at CERN Several different experiments Experiments struggle with huge amounts of data Deploy the LHC Computing Grid (LCG) Online steering tool for ATLAS experiment Basic functionality just requires to change the job options Advanced functionality can be added with source code instrumentation Online steering saves time and resources CGW Veranstaltung `06 3
5 Introduction Typical cycle: Configure job via job options Submit job Wait until job finished Retrieve job output Evaluation of the result Results may be meaningless because of Improper job parameters (e.g cuts) Semantic faults in job options, that are not found in test run CGW Veranstaltung `06 4
6 Related work Online steering in Reality Grid Needs direct access to job No secure communication Interactive communication in grids Crossgrid Interactive Grid Application Service Provider (I-GASP) Online steering in non-grid environments CUMULVS SCIRun VISIT CGW Veranstaltung `06 5
7 Environment (1) Integration into ATLAS experiment software Athena and ROOT visualization toolkit Athena framework: Event based List of algorithms Executed for every event Easy to add new algorithms and services job options algorithm1 algorithm2 algorithm3 algorithm4 algorithm5 Athena Job Svc1 Svc2 CGW Veranstaltung `06 6
8 Environment (2) Integration into Athena: New algorithm RM_Spy Job execution steering Most common results in ROOT files Restart with changed job options without resubmitting the job Only changes in job options (no source code changes) New service RM_SteeringSvc Steering and monitoring of user defined data Source code instrumentation necessary CGW Veranstaltung `06 7
9 Environment (3) Visualization tool ROOT Command line for C++ commands Extendable with shared libraries CGW Veranstaltung `06 8
10 Layered architecture steering tool grid job visualization data processing data consistency communication application data processing data consistency communication CGW Veranstaltung `06 9
11 Communication (1) Secure communication User side Administrator side Cope with typical site configurations Firewalls Private IP Job runs on unknown host Connection by job id Hide complexity from user Dynamically deal with different site topologies Enable steering in as many cases as possible CGW Veranstaltung `06 10
12 Communication (2) Job registers itself to naming service (NS) e.g. R-GMA Steering tool gets location from NS Steering tool connects to communication service (CS) Connection between CS and job All connections use Globus GSSAPI Additional end to end authentication UI steering tool internet NS firewall CS CE firewall private IP network WN job CGW Veranstaltung `06 11
13 Communication (3) naming service security layer grid connection security layer message layer TCP connection grid connection security layer grid connection security layer message layer TCP connection steering tool communication service grid job CGW Veranstaltung `06 12
14 Data consistency layer Registration of arbitrary data with serialize methods Manage all communication Regular call of a check method CGW Veranstaltung `06 13
15 Conclusion and outlook Goals: Secure online connection Easy integration into ATLAS software framework Status: Prototype has been implemented First release scheduled for November Outlook: Extend for automated error detection and handling Steering of parallel jobs Communication between jobs CGW Veranstaltung `06 14
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