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Reconstruction Planning for Run7 Min Bias PRDFs at ACCRE Farm

Detailed preparations for Run7 Min Bias PRDFs reconstruction at Vanderbilt's ACCRE Farm, including CPU and storage availability, real-time reconstruction, network transfer tests, and collaboration efforts.

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Reconstruction Planning for Run7 Min Bias PRDFs at ACCRE Farm

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  1. Preparations for Reconstruction of Run7Min Bias PRDFs at Vanderbilt’s ACCRE Farm(more substantial update set for next week) Charles Maguire et al. Analysis Meeting

  2. Proposed Effort and Preparations • ACCRE farm will reconstruct ~10% Run7 Min Bias filtered PRDFs • Reconstruction (PRDFs to nanoDSTs) will be done in near real time • Have confirmed that 50-75 CPUs and 50-75 TBytes are available • The nanoDSTs will be transported back to RCF in real time (where?) • Preparations so far • Copied Run4 Au+Au PRDFs to Vanderbilt (same run as for CCF) • Reconstructed with pro.74 library using Fun4Everyone_new.C macro • Re-using machinery from Run6 Level2 reconstruction project • GridFTP server on ACCRE • File handling scripts written by David Silvermyr and myself • Database updating software written by Hugo Valle (still being modified) • Began new network transfer tests BNL <--> ACCRE (results next slide) Analysis Meeting

  3. GridFTP Network Transfer Tests • ACCRE to rftpexp01/rftpexp02 (February 14) • Source on a local ACCRE node writing to /data/phenix areas • Two GridFTP jobs running simultaneously, same 8 GByte file • Saw 43.4 MBytes/second (21.91 + 21.53 Mbytes/second) • New issues (2007) • ACCRE engineers have security concerns about GridFTP • Want to meet with BNL people to address those concerns • What protections are other sites taking who use GridFTP • Limited number of boxes at BNL which will be used? Analysis Meeting

  4. To Do List (as of March 14) • Resume network testing and development from bufferboxes • Martin (or me with my own 1008 account ) is to do these tests • Will use the Run 6 automated transfer mechanism • Test the production macros and reco libraries for Run7 Min Bias • Cooperation between Carla, Raphael, and VU • Analysis of nanoDSTs for quality control (what should we look at?) • Establish the files return and archiving mechanism (next week) • Disk area at RCF (should it be a dCache?), and how much • Possible tape archiving system at ACCRE (save both input and output) • People on task at VU • Ivan Danchev (research associate) • Hugo Valle (third year graduate student) • Ron Belmont (second year graduate student) • Dillon Roach (second year graduate student) • ACCRE engineers monitoring 24/7 Analysis Meeting

  5. Backup: What is ACCRE at Vanderbilt? • ACCRE • Advanced Computing Center for Research and Education • Collaborative $8.5M computing resource funded by Vanderbilt • Presently consists of over 1500 processors and 100 TB of disk(VU group has its own dedicated 4.5 TB for PHENIX simulations) • Much work by Medical Center and Engineering school researchersas well as by Physics Department groups • ACCRE eager to continue with physics experiment reconstructionfirst PHENIX and then CMS (new encouragement from DOE) • Previous PHENIX Use of ACCRE • First used extensively for supporting QM’02 simulations • Order of magnitude increased work during QM’05 simulations • Run6 Level2 PRDFs reconstructed in real time Analysis Meeting

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