CMS HLT production using Grid tools

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1 CMS HLT production using Grid tools Flavia Donno (INFN Pisa) Claudio Grandi (INFN Bologna) Ivano Lippi (INFN Padova) Francesco Prelz (INFN Milano) Andrea Sciaba` (INFN Pisa) Massimo Sgaravatto (INFN Padova) Zhen Xie (INFN Pisa)

2 Introduction Goals Evaluate the existing GRID technologies with real applications and on real production environments Can these GRID tools be useful to manage these HEP applications? Collaboration between: CMS INFN-GRID WP 1 (Installation and Evaluation of the Globus toolkit) DataGrid WP 1 (Grid Workload Management)

3 Applications Signal MB Objectivity Database HLT Algorithms New Reconstructed Objects HEPEVT ntuples Catalog import ORCA Digitization (merge signal and MB) Catalog import CMSIM Objectivity Database Objectivity Database HLT Grp Databases Zebra files with HITS ORCA oohit Formatter Objectivity Objectivity Database ytivitcejbo Database esabatad MC Prod. ORCA Prod. Mirrored Db s

4 Tested configuration for CMS production Production manager Submit jobs condor_submit (Globus Universe) Condor-G as reliable, crash-proof submitting service Condor-G Padova GRAM as uniform interface to different resource management systems Local Resource Management Systems Globus GRAM CONDOR Globus GRAM LSF CMS Farms Bologna Pisa

5 Overview PC farms at each site installed and configured using the CMS farm kickstart toolkit PC farms managed by possible different local resource management systems Globus GRAM as uniform interface to the different local resource management systems Globus deployment using the INFNGRID distribution toolkit (see Zhen s presentation) considering the INFN setup

6 Overview Condor-G as reliable, crash proof submitting service Job submission and monitoring by the production manager from a single machine The production manager decides on which Globus resource (farm) the job must be executed Executable and input files stored on the executing farm Output files created on the executing machine Log files created on the submitting machine Authentication using Globus GSI (use of certificates signed by INFN CA)

7 Results The CMS production using Globus and Condor-G failed Many many many memory leaks found in the Globus jobmanager!!!... but we (Francesco Prelz, INFN Milano) have been able to provide fixes for these bugs Fixes reported to Globus team Feedback only for what concerning the bugs in the GAA and GSS modules (new fixes merged with the original ones) Work in progress Tests with these fixes Fixes included in the INFN-GRID distribution

8 Other problems Globus GRAM Some minor bugs found and fixed (fixes included in the INFN-GRID distribution) Necessary to address some major problems Scalability (one jobmanager for each job) Reliability (the jobmanager is not persistent) Condor-G Some problems in the current implementation (it s a prototype) Scalability in the submitting machine Logging

9 Next steps New tests considering the next CMS productions with the patched Globus jobmanager New tests with the new implementations of Condor-G and Globus jobmanager (by Condor team) Tests with bypass Tool written by D. Thain (Condor team) that allows redirection of standard input/output/error to a remote machine (the submitting machine) while the program is running (split execution system) Use of GSI authentication mechanisms New implementation reliable to several kind of failures Tests with the first WP 1 prototype Integration with software provided by the other WPs (i.e. replica management tools,..)

10 Prototype workload management system architecture Master chooses in which Globus resources the jobs must be submitted Condor-G able to provide a reliable/crashproof job submission service Submit jobs (using Class-Ads) Condor-G Master condor_submit (Globus Universe) Resource Discovery Grid Information Service (GIS) Other info Information on characteristics and status of local resources Globus GRAM as uniform interface to different local resource management systems Globus GRAM Globus GRAM Globus GRAM Local Resource Management Systems CONDOR LSF PBS Farms Site1 Site2 Site3

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