CC-J Monthly Report Shin’ya Sawada (KEK) for CC-J Working Group

02/09/2000CC-J by S.Sawada2 Contents VRDC event generation at CC-J Hardware upgrade plan in near future Very preliminary plan towards CC-J operation

02/09/2000CC-J by S.Sawada3 VRDC event CC-J Au-Au –Central arm, central bias: 40k events –Central arm, minimum bias: 80k events Hijing-PISA99-PHOOLresp PISA files and PRDF’s are being sent to via WAN. ~100 files for central arm & central bias already exist at RCF. proton-proton (Pythia-)PISA99-PHOOLresp –Central arm (open heavy flavor): 40k events –Muon arm (DY, min. bias): 318k events Trigger study –Central arm (J/  &  114k events

02/09/2000CC-J by S.Sawada4 Throughput (CPUT) Numbers are reduced to 450MHz pentium CPU Hijing: ~30min./600ev (central bias) PISA99: –Au-Au central arm, minimum bias:~200sec/event –Au-Au central arm, central bias: ~500sec/event –Proton-proton and trigger runs: vary case by case Response chain: –Au-Au central arm, minimum bias: ~15sec/event –Au-Au central arm, central bias: ~40sec/event –Proton-proton and trigger runs: vary case by case

02/09/2000CC-J by S.Sawada5 Throughput (Data transfer) Data amount for Au-Au: –PISAout: ~300MB/200ev (min. bias) ~800MB/200ev (cent. bias) –PRDF: ~1GB/200ev rcp from CC-J to BNL (spin.riken.bnl.gov): –~350kB/sec/1-rcp –~700kB/sec/2-rcp –~950kB/sec/3-rcp total throughput would be being saturated around here mainly due to the network bandwidth around RIKEN. APAN has much more band width.

02/09/2000CC-J by S.Sawada6 Problems “Successful” event ratio PISA99 –“BIMPCT”: Reported at PHENIX computing meeting on Janurary 2000 by Y.Watanabe. C.Maguire commented that it was due to FLUKA and his simulation group was going to patch this problem by skipping bad events. –“ZEBRA error”: A part of them could be reproduced again => software problem? Another part of them could not be reproduced => hardware (memory etc.) problem? PHOOL response chain –‘segmentation violation’ … Need more study.

02/09/2000CC-J by S.Sawada7 Notes File name convention –Tarun, Indrani, Tim and others have agreed with the rule, it might not be a eternal version. Runs at CC-J have 1E8 offsets. Run # database –Even now, many runs for various kinds. –Simulation work will continue for the order of decade.  Should be included in the to-do list. Script –Stable and easy-to-understand job scripts (or their templates) should be written, especially for various people to use the farm.  “script builder” in the to-do list.

02/09/2000CC-J by S.Sawada8 Notes continued Read/write via NFS –At RCF, Charlie’s team seems to read/write all the files via NFS, while we rcp (or pftp) files to/from the local disk before/after the simulation. CC-J experience shows NFS- write would be a bottle neck for the simulation with high I/O rates. (see “mu-camera” for the muon arms –might have to be developed soon. Memory usage for the response chain –was about 300MB in some cases, while we have 256MB real memory per CPU.

02/09/2000CC-J by S.Sawada9 Hardware upgrade plan / CC-J schedule More 32 CPUs (700MHz?) will be purchased by the end of March.  Total number of CPUs will be 96. –How about the status of RH6.1 tests? More 1.6TB RAID disk will be purchased by the end of March.  Total work disk will be 3.2TB. ‘Acceptance’ tests of HPSS and other components will be in February and March. Test operation for PHENIX from around mid-March? Routine operation from May?

02/09/2000CC-J by S.Sawada10 Very preliminary idea on CC-J operation See the Proposal for the PHENIX CC-J. – Discussions are going among related people. –CC-J Planing and Coordination Office will be established. –Simulation should be proposed through PWG’s? –Each PWG should define responsible persons for the simulation? –A simulation coordinator at the PHENIX side??  A detailed announcement will be at the next core week.

02/09/2000CC-J by S.Sawada11 To do Tests for replication of Objectivity/DB “script builder”? –At least good templates are necessary. If one has a good template, he/she could easily develop a GUI/web based “script builder”. Run number database?? –So many simulation, so many runs of simulated events, various conditions for runs… Documentation –Explain CC-J specific configuration, rules and so on, published on the web and/or with pdf.